Texas Vascular Plant Checklist:  Nyctaginaceae
The Four O'clock Family
(Magnoliophyta, Magnoliopsida, Caryophyllidae)

 Abronia
   ameliae Lundell (amelia's sand verbena)
   angustifolia Greene (narrowleaf sand verbena)
   carletonii Coult. & Fisher (carleton sand verbena)
   fragrans Nutt. ex Hook. (sweet sand verbena, snowball sand verbena)
   macrocarpa L.A. Gal. (large fruit sand verbena)

 Acleisanthes
   acutifolia Standl. (needle tip trumpets)
   anisophylla Gray (obliqueleaf trumpets)
   crassifolia Gray (texas trumpets)
   longiflora Gray (angel trumpets, yerba-de-la-rabia)
   obtusa (Choisy) Standl. (berlandier trumpets)
   wrightii (Gray) Benth. & Hook. f. ex Hemsl. (wright trumpets)

 Allionia
   choisyi Standl. (smooth umbrella-wort)
   incarnata var. incarnata (trailing allionia, trailing four-o-clock, umbrella-wort, herba de la hormiga)

 Ammocodon
   chenopodioides (Gray) Standl. (goosefoot moonpod)

 Anulocaulis
   eriosolenus (Gray) Standl. (big bend ringstem)
   gypsogenus Waterfall (gyp ringstem)
   leiosolenus var. lasianthus I.M. Johnston
   leiosolenus var. leiosolenus
   reflexus I.M. Johnston (texas ringstem)

 Boerhavia
   anisophylla Torr. (wine spiderling)
   coccinea P. Mill. (scarlet spiderling)
   diffusa L. (scarlet spiderling)
   erecta L. (erect spiderling)
   gracillima Heimerl (slimstalk spiderling)
   intermedia M.E. Jones (spreading spiderling)
   linearifolia Gray (narrowleaf spiderling)
   mathisiana F.B. Jones (mathis' spiderling)
   purpurascens Gray (purple spiderling)
   scandens L. (climbing wartclub, pega-polla)
   spicata Choisy (creeping spiderling)
   wrightii Gray (wright spiderling)

 Bougainvillea
   glabra Choisy (bougainvillea)

 Cyphomeris
   crassifolia (Standl.) Standl. (sinuate-lobed cyphomeris)
   gypsophiloides (Mart. & Gal.) Standl. (red cyphomeris)

 Mirabilis
   albida (Walt.) Heimerl (white four o'clock)
   austrotexana B.L. Turner (lonestar four o'clock)
   comata (Small) Standl. (hairy tuft four o'clock)
   gigantea (Standl.) Shinners (giant four-o'clock)
   glabra (S. Wats.) Standl. (smooth four-o'clock)
   glabrifolia (Ortega) I.M. Johnston (flottop four-o'clock)
   hirsuta (Pursh) MacM. (hairy four-o'clock)
   jalapa L. (common four-o'clock)
   linearis (Pursh) Heimerl (linearleaf four-o'clock)
   longiflora var. wrightiana (Gray ex Britton & Kearney) Kearney & Peebles (sweet four-o'clock)
   multiflora var. multiflora (colorado four-o'clock)
   nyctaginea (Michx.) MacM. (wild four-o'clock)
   oxybaphoides (Gray) Gray (spreading four-o'clock)
   texensis (Coult.) B.L. Turner (texas four o'clock)

 Nyctaginia
   capitata Choisy (scarlet muskflower)

 Pisonia
   aculeata L. (devil's claw, cockspur)

 Selinocarpus
   angustifolius Torr. (narrowleaf moonpod)
   diffusus Gray (spreading moonpod)
   lanceolatus Woot. (gyp moonpod)
   maloneanus B.L. Turner (gypsum moonpod)
   parvifolius (Torr.) Standl. (littleleaf moonpod)

 Tripterocalyx
   carnea var. carnea (winged sand verbena)