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Inflorescences

Dissections:
Monroa squarrosa

MONROA Torr.
Plant hermaphroditic, stoloniferous, annual. Culms mostly mat forming (much-branched), erect floriferous culms less than 15 cm tall, scabrous to hairy; internodes solid or hollow, terete. Leaves basal; sheaths terete, margins open; auricles absent; ligules a line of hairs; blades flat or folded, pungent with thick margins. Panicles a cluster of subsessile spikelets (spatheate); primary branches appressed, terminating in a spikelet. Spikelets in clusters (2-4), laterally compressed, pedicellate, pedicels without glands; disarticulation above glumes; florets 2-8, callus glabrous; reduced floret at apex; glumes of lowermost 1-2 spikelets 1-veined, equal, shorter than florets, glabrous (uppermost 1-2 spikelets with first glume absent), glabrous; lemmas 3-veined, membranous to coriaceous, emarginate to lobed, central vein extending into an awn (lateral veins forming mucro), scabrous, veins hairy; paleas 2-veined, awnless, glabrous. Stamens 2-3; anthers yellow. Caryopses dorsiventrically compressed. Base chromosome number x=8.

A genus of three to six species native to the New World. Monroa is assumed to be related to Dasyochloa and Erioneuron based on base chromosome numbers, and silica distribution patterns in lemma, and morphology.