Bibiography:  Author Listing
Author group 'L'

La Duke, J. C. 1985. A new species of Sphaeralcea (Malvaceae). Southwestern Naturalist 30:433-436.

La Duke, J. C. and D. K. Northington. 1978. The systematics of Sphaeralcea coccinea (Nutt.) Rydb. (Malvaceae). Southwestern Naturalist 23(4):651-660.

La duke, J.C. and J. Doebley. 1995. A chloroplast DNA based phylogeny of the Malvaceae Syst. Bot. 20:259-271.

La Frankie, Jr. J. V. 1986a. Morphology and taxonomy of the New World species of Maianthemum (Liliaceae). Journal of the Arnold Arboretum 67(4):371-439.

La Frankie, Jr. J. V. 1986b. Transfer of the species of Smilacina to Maianthemum (Liliaceae). Taxon 35:584-589.

La Hham, J. N. 1980. A taxonomic study of the Carex pensylvanica complex (Cyperaceae) in North America. Ph.D. Disseration. The Pennsylvania State University.

Lacey, J.B. 1969. Key to violets (Viola, Violaceae) of Nacogdoches County, Texas Sida 3:311-312.

Lammers, T.G. 1992. Circumscription and phylogeny of Campanulales Ann. Missouri Bot. Gard. 79:388-413.

Lammers, T.G. 1993. Chromosome numbers of Campanulaceae III, Review and integration of data for subfamily Lobelioideae, Amer. J. Bot. 80:660-675.

Lamotte, C. 1940. Pilularia in Texas. American Fern Journal 30:99-101.

Lampe, K.E. 1986. Contact dermatitis from Sonoran Desert plants Desert Pl. 8:32-37.

Lampe, K.E. and M.A. McCann. 1985. AMA handbook of poisonous and injurious plants American Medical Association, Chicago.

Lamson-Scribner, F. 1884. New North American grasses. Bulletin of the Torrey Botanical Club 11:5.

Landolt, E. 1975. Morphological differentiation and geographical distribution of the Lemma gibba-Lemna minor group Aquatic Bot. 1:345-363.

Landolt, E. 1980. Biosystematic investigation of the family of duckweeds (Lemnaceae) (Vol. 1) Veröff. Geobot. Inst. ETH Stiftung Rübel, Zürich 70:1-247.

Landolt, E. 1986. The family of Lemnaceae--A monographic study 2 Vols. Veröffentlichugen des Geobotanischen Institutes Rübel in Zürich 71:1-566.

Landrum, L. R. 1986. Campomanesia, Pimenta, Blepharocalyx, Legrandia, Acca, Myrrhinium, and uma (Myrtaceae). Flora Neotropica. Monograph 45:1-178.

Landry, P. No Date. A revised synopsis of the pines 5: The subgenera of Pinus, and their morphology and behavior. Phytologia 76(1):73-79.

Lane, M. A. 1979. Taxonomy of the genus Amphiachyris (Asteraceae: Astereae). Systematic Botany 4:178-189.

Lane, M. A. 1982. Generic limits of Xanthocephalum, Gutierrezia, Amphiachyris, Gymnosperma, Greenella and Thurovia (Compositae: Astereae). Systematic Botany 7:405-416.

Lane, M. A. 1983. Taxonomy of Xanthocephalum (Compositae: Astereae). Systematic Botany 8:305-316.

Lane, M. A. 1985. Taxonomy of Gutierrezia (Compositae: Astereae) in North America. Systematic Botany 10:2-28.

Lane, M.A. 1980. New and re-instated combinations in Gutierrezia (Compositae: Astereae) Sida 8:313-314.

Lane, M.A. and R.L. Hartman. 1996. Reclassification of North American Haplopappus (Compositae: Astereae) completed: Rayjacksonia gen. nov Amer. J. Bot. 356-370.

Lane, T.M. 1983. Mericarp micromorphology of Great Plains Scutellaria (Labiatae). SouthW. Naturalist 28:71-79.

Lane, T.M. 1986. Scutellaria. In: Great Plains Flora Association Flora of the Great Plains. Pp. 733-737, Univ. Press of Kansas, Lawrence.

Larisey, M. 1940. A monograph of the genus Baptisia Ann. Missouri Bot. Gard. 27:119-244.

Larsen, E.L. 1927. A revision of the genus Townsendia Ann. Missouri Bot. Gard. 14:1-46.

Larsen, E.L. 1933. Astranthium and related genera Ann. Missouri Bot. Gard. 20:23-44.

Larsen, E.L. 1940. Lobelia as a sure cure for venereal disease Amer. J. of Syphilis, Gonorrhea, and Venereal Diseases 24:13-22.

Larsen, G.E. 1986. Caryophyllaceae. In: Great Plains Flora Association Flora of the Great Plains Pp.192-214, Univ. Press of Kansas, Lawrence.

Larsen, G.E. and W.T. Barker. 1986. Potamogetonaceae. In: Great Plains Flora Association Flora of the Great Plains Pp. 1032-1039, Univ. Press of Kansas, Lawrence.

Larson, S.R. and J. Doebley. 1994. Restriction site variation in the chloroplast genome of Tripsacum (Poaceae): Phylogeny and rates of sequence evolution Syst. Bot. 19:21-34.

Lassen, P. 1989. A new delimitation of the genera Coronilla, Hippocrepis, and Securigera (Fabaceae) Willdenowia 19:49-62.

Lasseter, J. S. 1984. Taxonomy of the Vicia ludoviciana complex (Leguminosae). Rhodora 86:475-505.

Lassetter, J.S. 1978. Seed characters in some native American vetches Sida 7:255-263.

Laushman, R.H. SCHNABEL, A., and J.L. Hamrick. 1996. Electrophoretic evidence for tetrasomic inheritance in the dioecious tree Maclura pomifera (Raf.) Schneid J. Heredity 87:469-473.

LaVala, V. and S. Sabato. 1983. Nomenclature and typification of Ipomoea imperati (Convolvulaceae). Taxon 32:110-114.

Lawrence, G. H. M., A. F. G. Buchheim, G. S. Daniels, and A. Dolezal. 1968. (eds.). B-P-H: Botanico-Periodicum-Huntianum. Hunt Botanical Library, Pittsburg, PA.

Laws, W.D. 1962. The soils and vegetation of a relict area of Blackland Prairie Part 1: An investigation of the soils of the Stults Meadow, a relict area of Blackland Prairie, Wrightia 2:229-241.

Lazarine, P. 1980 (1981). Common Wetland Plants of Southeast Texas. United States Army Corps of Engineers, Galveston District, Galveston, TX.

Le Duc, A. 1995. A revision of Mirabilis section Mirabilis (Nyctaginaceae) Sida 16:613-648.

Le Duc, F. A. 1993. Systematic study of Mirabilis section Mirabilis (Nyctaginaceae). Ph.D. Disseration. University of Texas, Austin.

Lee, D.W. 1975. Population variation and introgression in North American Typha Taxon 24:633-641.

Lee, D.W. and D.E. Fairbrothers. 1969. A serological and disk electrophoretic study of North American Typha Brittonia 21:227-243.

Lee, KS; Dunton, KH 2000. Effects of nitrogen enrichment on biomass allocation, growth, and leaf morphology of the seagrass Thalassia testudinum Marine Ecology Progress Series, 196 (-) pp. 39-48, 2000

Lee, Y.S. 1981. Serological investigations in Ambrosia (Compositae: Ambrosieae) and relatives Syst. Bot. 113-125.

Lee, Y.S. and D.B. Dickinson. 1980. Field observations on hybrids between Ambrosia bientata and A. trifida (Compositae) Amer. Midl. Naturalist 103:180-184.

Lee, Y-T. 1976. The genus Gymnocladus and its tropical affinities J. Arnold Arbor. 57:91-112.

Legrand, C.D. 1962. Las especies Americanas de Portulaca Anales Mus. Hist. Nat. Montevideo 7:1-147.

Lellinger, D. B. 1985. A Field Manual of the Ferns & Fern-allies of the United States & Canada. Smithsonian Instituion Press, Washington, D.C.

Lelong, M. G. 1984. New combinations for Panicum subgenus Panicum and subgenus Dichanthelium (Poaceae) of the southeastern United States. Brittonia 36(3):262-273.

Lelong, M. G. 1986. A taxonomic treatment of the genus Panicum (Poaceae) in Mississippi. Phytologia 61(4):251-269.

Lemke, D. E. 1987. First record of Lechea pulchella (Cistaceae) for Texas. Southwestern Naturalist 32:278-279.

Lemke, D. E. 1991. The genus Solanum (Solanaceae) in Texas. Phytologia 71(5):362-378.

Lemke, D. E. 1992. Schinus terebinthifolius (Anacardiaceae) in Texas. Phytologia 72(1):42-44.

Lemke, D. E. and E. L. Schneider. 1988. Xanthosoma sagittifolium (Araceae) new to Texas. Southwestern Naturalist 33:498-499.

Lemke, D. E. and R. D. Worthington. 1991. Brassica and Rapistrum (Brassicaceae) in Texas. Southwestern Naturalist 36(2):194-197.

Lemke, D. E. and V. Wesby. 1989. Anchusa azurea (Boraginaceae), new to Texas. Sida 13(4):516.

Leonard, E. C. 1927. The North American species Scutellaria. Contributions from the United States National Herbarium. Smithsonian Institution 22:703-748.

Les, D. H. 1985. The phytogeography of Ceratophyllum demersum and C. echinatum (Ceratophyllaceae) in glaciated North America. Canadian Journal of Botany 64:498-509.

Les, D.H. 1986. The evolution of achene morphology in Ceratophyllum (Ceratophyllaceae), I Fruit spine variation and relationships of C. demersum, C. submersum, and C. apiculatum, Syst. Bot. 11:549-558.

Les, D.H. 1988a. The origin and affinities of the Ceratophyllaceae Taxon 37:326-345.

Les, D.H. 1988b. The evolution of achene morphology in Ceratophyllum (Ceratophyllaceae), II Fruit variation and systematics of the, Syst. Bot. 13:73-86.

Les, D.H. 1988c. The evolution of achene morphology in Ceratophyllum (Ceratophyllaceae), III Relationships of the, Syst. Bot. 13:509-518.

Les, D.H. 1989. The evolution of achene morphology in Ceratophyllum (Ceratophyllaceae), IV. Summary of proposed relationships and evolutionary trends Syst. Bot. 14:254-262.

Les, D.H. 1993. Ceratophyllaceae. In: K. Kubitzki, J.C. Rohwer, and V. Bittrich, eds The families and genera of vascular plants, Vol. II Pp. 246-250, Springer-Verlag, Berlin.

Les, D.H. 1997. Ceratophyllaceae. In: Flora of North America Editorial Committee, eds, Fl. North Amer. 3:81-88 Oxford Univ. Press, New York and Oxford.

Les, D.H. and R.R. Haynes. 1996. Coleogeton (Potamogetonaceae), a new genus of pondweeds Novon 6:389-391.

Lesins, K.A. and I. Lesins. 1979. Genus Medicago (Leguminosae) W. Junk, The Hague, Netherlands.

Leuenberger, B. E. 1991. Interpretation and typification of Cactus ficus-indica L. and Opuntia ficus-indica (L.) Miller (Cactaceae). Taxon 40(4):621-627.

Leuenberger, B. E. 1993. Interpretation and typification of Cactus opuntia L., Opuntia vulgaris Mill., and O. humifusa (Rafin.) Rafin. (Cactaceae). Taxon 42(2):419-429.

Leung, A.Y. and S. Foster. 1996. Encyclopedia of common natural ingredients used in food, drugs, and cosmetics, 2nd ed;John Wiley and Sons, Inc New York.

Levin, G. A. 1999. Notes on Acalypha (Euphorbiaceae) in North America Rhodora 101(907): 217-233.

Lewis, H. 1945. A revision of the genus Trichostema Brittonia 5:276-303.

Lewis, H. and R. Snow. 1951. A cytotaxonomic approach to Eschscholzia Madroño 11:141-143.

Lewis, I. M. 1915. The Trees of Texas. Bulletin of the University of Texas, No. 22, Austin.

Lewis, W. A. 1972. Hedyotis correllii (Rubiaceae): a new Texas species. Brittonia 24:395-397.

Lewis, W.H. 1958 [1959]. Chromosomes of the east Texas Hedyotis (Rubiaceae) SouthW. Naturalist 3:204-207.

Lewis, W.H. 1971. Pollen differences between Stylisma and Bonamia (Convolvulaceae) Brittonia 23:331-334.

Lewis, W.H. 1976. Temporal adaptation correlated with ploidy in Claytonia virginica Syst. Bot. 1:340-347.

Lewis, W.H. and J.C. Semple. 1977. Geography of Claytonia virginica cytotypes Amer. J. Bot. 64:1078-1082.

Lewis, W.H. and M.P.F. Elvin-lewis. 1977. Medical botany: Plants affecting man's health John Wiley & Sons, New York.

Lewis, W.H. and P.R. Fantz. 1973. Tribal classification of the Triosteum (Caprifoliaceae) Rhodora 75:120-121.

Lewis, W.H. and R.L. Oliver. 1965. Realignment of Calystegia and Convolvulus (Convolvulaceae) Ann. Missouri Bot. Gard. 52:217-222.

Lewis, W.H. and R.L. Oliver. 1974. Revision of Richardia (Rubiaceae) Brittonia 26:271-301.

Lewis, W.H., P. Vinay, and V.E. Zenger. 1983. Airborne and allergenic pollen of North America Johns Hopkins Univ. Press, Baltimore, MD.

Lewis, W.H., R.L. Oliver, and Y. Suda. 1967. Cytogeography of Claytonia virginica and its allies Ann. Missouri Bot. Gard. 54:153-171.

Lewis, W.H., Y. Suda, and B. Macbryde. 1967. Chromosome numbers of Claytonia virginica in the St. Louis, Missouri area Ann. Missouri Bot. Gard. 54:147-152.

Li, H.-L. 1952a. The genus Tovara (Polygonaceae) Rhodora 54:19-25.

Li, H.-L. 1952b. Floristic relationships between eastern Asia and eastern North America Trans. Amer. Philos. Soc. 42:371-409.

Li, H; Lascano, RJ; Booker, J; Wilson, LT; Bronson, KF 2001. Cotton lint yield variability in a heterogeneous soil at a landscape scale Soil and Tillage Research, 58 (3-4) pp. 245-258, 2001

Li, S. and K.T. Adair. 1994. Species pools in eastern Asia and North America Sida 16:281-299.

Li, S. and K.T. Adair. 1997. Species pools of seed plants in eastern Asia and North America Arthur Temple College of Forestry, Stephen F. Austin State Univ., Nacogdoches, TX.

Lichvar, R. W. 1983. Evaluation of varieties in Stanleya pinnata (Cruciferae). Great Basin Naturalist 43:684-686.

Lidn, M. 1986. Synopsis of Fumarioideae (Papaveraceae) with a monograph of the tribe Fumarieae Opera Bot. 88:1-133.

Lidn, M. 1993. Fumariaceae. In: K. Kubitzki, J.C. Rohwer, and V. Bittrich, eds The families and genera of vascular plants, Vol. II Pp. 310-318, Springer-Verlag, Berlin.

Liede, S. 1996. Sarcostemma (Asclepiadaceae)--a controversial generic circumscription reconsidered: Morphological evidence Syst. Bot. 21:31-44.

Liede, S. 1997. Subtribes and genera of the tribe Asclepiadaceae (Apocynaceae, Asclepiadoideae) - a synopsis Taxon 46:233-247.

Liede, S. and F. Albers. 1994. Tribal disposition of genera in the Asclepiadaceae. Taxon 43(2):201-231.

Liew, F. S. 1972. Numerical taxonomic studies on North American lady ferns and their allies. Taiwania 17:190-221.

Liggio, J. and A. O. Liggio. 1999. Wild Orchids of Texas. University of Texas Press, Austin.

Lim, D. 1998. Microbiology, 2nd. Ed WCB/McGraw-Hill, Boston, MA.

Lincecum, G. 1861. The grasses of Texas Southern Cultivator 19:33-34, 51-52.

Lincecum, G. 1862. Agricultural ant of Texas J. Linn. Soc., Zoo. 6:29-31.

Lincecum, J.B. and E.H. Phillips. 1994. Adventures of a frontier naturalist: The life and times of Dr. Gideon Lincecum Texas A&M Univ. Press, College Station.

Lincecum, J.B.,E.H. Phillips, and P.A. Redshaw. 1997. Science on the Texas frontier: Observations of Dr. Gideon Lincecum Texas A&M Univ. Press, College Station.

Linnaeus, C. 1753. Species Plantarum.... 2 vols Stockholm.

Linnaeus, C. 1754. Genera Plantarum, ed. 5 Stockholm.

Lippok, Barbara, Angela A. Gardine, Paula S. Williamson, and S. S. Renner 2000. Pollination by flies, bees, and beetles of Nuphar ozarkana and N. advena (Nymphaeaceae) Am. J. Bot. 87: 898-902.

Lipscomb, B. L. 1978b. Additions to the Texas flora. Sida 7:393-394.

Lipscomb, B. L. 1984. New additions or otherwise noteworthy plants of Texas. Sida 10:326-327.

Lipscomb, B. L. and E. B. Smith. 1977. Morphological integradation of varieties of Bidens aristosa (Compositae) in northern Arkansas. Rhodora 79:203-213.

Lipscomb, B. L. and G. Ajilvsgi. 1982. Bellardia trixago (L.) All. (Scrophulariaceae) adventive in Texas. Sida 9:370-374.

Lipscomb, B.L. 1978a. Cyperus surinamensis (Cyperaceae): New to Arkansas, Kansas, and Oklahoma Sida 7:307.

Lipscomb, B.L. 1980. Cyperus difformis L. (Cyperaceae) in North America Sida 8:320-327.

Lipscomb, B.L. 1992. Visitors/Clientele [Information on Maclura pomifera (bois d'arc) from Fred Tarpley] Iridos 3(4):1.

Lipscomb, B.L. 1993. Pseudotsuga. In: Flora of North America Editorial Committee, eds, Fl. North Amer. 2:365-366 Oxford Univ. Press, New York and Oxford.

Lipscomb, B.L. and G.M. Diggs, Jr. 1998. The use of animal-dispersed seeds and fruits in forensic botany Sida 18 (In Press).

Lira, R., J.L. Villaseor, and P.D. Davila. 1997 [1998]. A cladistic analysis of the subtribe Sicyinae (Cucurbitaceae) Syst. Bot. 22:415-425.

Little, E.L. 1970. Endemic, disjunct and northern trees in the southern Appalachians. In: P.C. Holt and R.A. Paterson, eds The distributional history of the biota of the southern Appalachians, Part II: Flora Pp. 249-290, Research Division Monog. 2, Virginia Polytechnic Institute and State Univ., Blacksburg, VA.

Little, E.L. 1971. Atlas of United States trees, Vol. 1, Conifers and important hardwoods U.S.D.A. Forest Serv. Misc. Publ. No. 1146.

Little, E.L. 1976. Atlas of United States trees, Vol. 3, Minor western hardwoods U.S.D.A. Forest Serv. Misc. Publ. No. 1314.

Little, E.L. 1976 [1977]. Atlas of United States trees, Vol. 4, Minor eastern hardwoods U.S.D.A. Forest Serv. Misc. Publ. No. 1342.

Little, E.L. 1983. North American trees with relationships in eastern Asia Ann. Missouri Bot. Gard. 70:605-615.

Little, Jr., E. L. 1969. Two varietal transfers in Carya (hickory). Phytologia 19:186-190.

Littlejohn, R. O. 1979. Woody vegetation associated with six oxbow lakes in East Texas. Master's Thesis. Stephen F. Austin State University, Nacogdoches, TX.

Lloyd, R. M. 1974. Systematics of the genus Ceratopteris Brongn. (Parkeriaceae). II. Taxonomy. Brittonia 26(2):139-160.

Lockett, L. 1991. Native Texas palms north of the lower Rio Grande valley Principes 35:64-71.

Loconte, H. 1993. Berberidaceae. In: K. Kubitzki, J.C. Rohwer, and V. Bittrich, eds The families and genera of vascular plants, Vol. II Pp. 147-152, Springer-Verlag, Berlin.

Loconte, H. and J.R. Estes. 1989. Phylogenetic systematics of Berberidaceae and Ranunculales (Magnoliidae) Syst. Bot. 14:565-579.

Lonard, R. I. 1974. An artificial key to cultivated perennial plants on the West Campus of Pan American University, Edinburg, TX. Mimeorgraphed.

Lonard, R. I. 1993. Guide to the Grasses of the Lower Rio Grande Valley, Texas. University of Texas-Pan American Press, Edinburg, TX.

Lonard, R. I. and F. R. Waller, Jr. 1971. Helianthus simulans (Compositae) in Robertson County new to Texas. Southwestern Naturalist 16:121.

Lonard, R. I. and F. W. Gould. 1974. The North American species of Vulpia (Gramineae). Madroño 22:217-230.

Lonard, R. I. and F. W. Judd. 1981. The Terrestrial Flora of South Padre Island. Miscellaneous Papers No. 6. Texas Memorial Museum, University of Texas, Austin.

Lonard, R. I., F. W. Judd, and S. L. Sides. No Date. Annotated checklist of the flowering plants of South Padre Island, Texas. Southwestern Naturalist 23(3):497-510.

Lonard, R. I., J. H. Everitt, and F. W. Judd. 1991. Woody Plants of The Lower Rio Grande Valley, Texas. Miscellaneous publication No. 7.Texas Memorial Museum, University of Texas, Austin.

Lonard, RI; Judd, FW; Everitt, JH; Escobar, DE; Davis, MR; Crawford, MM; Desai, MD 2000. Evaluation of color-infrared photography for distinguishing annual changes in riparian forest vegetation of the lower Rio Grande in Texas Forest Ecology and Management, 128 (1-2) pp. 75-81, 2000

Long, R. W. 1970. The genera of Acanthaceae in the southeastern United States. Journal of the Arnold Arboretum 51:257-309.

Long, R.W. 1961. Convergent patterns in Ruellia caroliniensis and R. humilis (Acanthaceae) Bull. Torrey Bot. Club 88:387-396.

Long, R.W. 1966. Artificial interspecific hybridization in Ruellia (Acanthaceae) Amer. J. Bot. 53:917-927.

Long, R.W. 1971. Floral polymorphy and amphimictic breeding systems in Ruellia caroliniensis (Acanthaceae) Amer. J. Bot. 58:525-531.

Long, R.W. 1973. A biosystematic approach to generic delimitation in Ruellia (Acanthaceae) Taxon 22:543-555.

Long, R.W. 1974. Variation in natural populations of Ruellia caroliniensis (Acanthaceae) Bull. Torrey Bot. Club 101:1-6.

Long, R.W. 1975. Artificial interspecific hybridization in temperate and tropical species of Ruellia (Acanthaceae) Brittonia 27:289-296.

Long, R.W. and L.J. Uttal. 1962. Some observations on flowering in Ruellia (Acanthaceae) Rhodora 64:200-206.

Long, R.W. and O. Lakela. 1971. A flora of tropical Florida Univ. of Miami Press, Coral Gables, Florida.

Longley, G. 1996. An introduction to the Edwards Aquifer Texas Organization for Endangered Species News and Notes, Spring-Fall 1996 issue, Pp. 15-17.

Lotrakul, P; Valverde, RA; De la Torre, R; Sim, J; Gomez, A 2000. Occurrence of a strain of Texas pepper virus in Tabasco and Habanero pepper in Costa Rica Plant Disease, 84 (2) pp. 168-172, 2000

Lott, E. J. and M. L. Butterwick. 1980. Notes on the flora of the Chinati Mountains, Presidio County, Texas. Sida 8:348-351.

Lott, E. J., B. M. Boom, and F. Chiang. 1982. Isoëtes butleri (Isoëtaceae) in Texas. Sida 9:264-266.

Lott, E. J., B. M. Boom, and F. Chiang. 1985. New combinations in Chihuahuan Desert Aquilegia (Ranunculaceae). Phytologia 58:488.

Loughmiller, C. and L. Loughmiller. 1984. A Field Guide: Texas Wildflowers. University of Texas Press, Austin.

Lourteig, A. 1952. Mayacaceae. Notulae Systematicae (Paris) 14(4):234-248.

Lve, ?. 1961. Some notes on Myriophyllum spicatum Rhodora 63:139-145.

Lve, ?. and D. LVE. 1975 [1976]. Nomenclatural notes on Arctic plants Bot. Not. 128:497-523.

Lve, D. and P. Dansereau. 1959. Biosystematic studies on Xanthium: Taxonomic appraisal and ecological status Canad. J. Bot. 37:173-208.

Love, G. 1994. The A-Z of cut flowers Penguin Books USA, New York.

Lowden, R. M. 1973. Revision of the genus Pontederia L. Rhodora 75(803):426-487.

Lowden, R. M. 1978. Studies on the submerged genus Ceratophyllum L. in the Neotropics. Aquatic Botany 4:127-142.

Lowden, R. M. 1982. An approach to the taxonomy of Vallisneria (Hydrocharitaceae). Aquatic Botany 13(3):269-298.

Lowden, R.M. 1986. Taxonomy of the genus Najas L. (Najadaceae) in the Neotropics Aquatic Bot. 24:147-184.

Lowry, P. P. and A. G. Jones. 1984. Systematics of Osmorhiza Raf. (Apiaceae: Apioideae). Annals of the Missouri Botanical Garden 71:1128-1171.

Luckow, L. 1993. Monograph of Desmanthus (Leguminosae-Mimosoideae). Systematic Botany Monograph 38:1-166.

Luckwill, L.C. 1943. The genus Lycopersicon: An historical, biological, and taxonomic survey of the wild and cultivated tomatoes Aberdeen Univ. Stud. 20:1-44.

Luer, C. A. 1972. The Native Orchids of Florida. The New York Botanical Garden, Bronx, NY.

Luer, C. A. 1975. The Native Orchids of the United States and Canada Excluding Florida. The New York Botanical Garden, Bronx, NY.

Luken, J.O. and J.W. Thieret. 1995. Amur honeysuckle (Lonicera maackii; Caprifoliaceae): Its ascent, decline, and fall Sida 16:479-503.

Luken, J.O. and J.W. Thieret. 1996. Amur honeysuckle, its fall from grace BioScience 46:18-24.

Luken, J.O. and J.W. Thieret. 1997. Assessment and mamagement of plant invasions Springer-Verlag, New York.

Luken, J.O., J.W. Thieret, and J.R. Kartesz. 1993. Erucastrum gallicum (Brassicaceae): Invasion and spread in North America Sida 15:569-582.

Lumpkin, T.A. 1993. Azollaceae. In: Flora of North America Editorial Committee, eds, Fl. North Amer. 2:338-342 Oxford Univ. Press, New York and Oxford.

Lundell, C. L. 1961. Flora of Texas. Vol. 3. Texas Research Foundation, Renner, TX.

Lundell, C. L. 1966. Flora of Texas. Vol. 1. Texas Research Foundation, Renner, TX.

Lundell, C. L. 1969a. Flora of Texas. Vol. 2. Texas Research Foundation, Renner, TX.

Lundell, C. L. 1977. Studies of American plants. XIV. Wrightia 5(9):331-351.

Lundell, C.L. 1945. New phanerogams from Texas, Mexico and Central America Wrightia 1:53-61.

Lundell, C.L. 1959. Studies of Physostegia-I New species and observations on others Wrightia 2:4-12.

Lundell, C.L. 1960. Studies of Physostegia-II Further notes on the Texas species Wrightia 2:66-74.

Lundell, C.L. 1968. A new species of Brazoria (Labiatae) from east Texas Wrightia 4:29-30.

Lundell, C.L. 1969b. Labiatae: Brazoria and Physostegia. In: C.L. Lundell, ed;Flora of Texas 2:319-330 Texas Research Foundation, Renner.

Lundell, C.L. 1969c. Celastraceae. In: C.L. Lundell, ed;Flora of Texas 2:339-355 Texas Research Foundation, Renner.

Luteyn, J. L. 1976. Revision of Limonium (Plumbaginaceae) in eastern North America. Brittonia 28:303-317.

Luteyn, J. L. 1990. The Plumbaginaceae in the flora of the southeastern United States. Sida 14(2):169-178.

Luteyn, J.L., ed. 1995. Ericaceae, Part II, the superior-ovaried genera Fl. Neotrop. Monogr. 66.

Lynch, D., Brother. 1981. Native and Naturalized Woody Plants of Austin and the Hill Country. Published by Texas: Saint Edward's University, Austin, TX.

Lyons, A.B. 1900. Plant names scientific and popular Nelson, Baker and Co., Detroit, MI.