Difference between revisions of "Dichanthelium pedicellatum"

Revision as of 21:59, 27 May 2020

Illustrator: Linda A. Vorobik, Hana Pazdírková

Plants cespitose, not rhizoma-tous. Basal rosettes absent. Culms 20-70 cm, initially erect, with hard, cormlike bases; nodes puberulent to sparsely hirsute; internodes all elongated, puberulent to hirsute; fall phase with decumbent culms, developing divaricate branches from the midculm nodes before the primary panicles mature. Cauline leaves 4-7; sheaths sometimes overlapping, puberulent to papillose-hispid, margins ciliate; ligules 0.3-1 mm, membranous and ciliate; blades 3-12 cm long, 2-8 mm wide, widening distal to the rounded or subcordate bases, thin, glabrous or sparsely hirsute, margins with papillose-based cilia. Primary panicles 3-6 cm long, 2-4 cm wide, exserted; branches spreading at maturity; pedicels somewhat divergent. Spikelets 3.2-4.4 mm long, 1.3-1.6 mm wide, narrowly obovoid-ellipsoid, papillose-hirsute, attenuate to the purplish bases. Lower glumes about 1/2 as long as the spikelets, narrowly triangular, subadjacent to the upper glumes, not encircling the pedicels; upper glumes about 0.3 mm shorter than the upper florets; lower florets sterile; upper florets with pointed, minutely puberulent apices. 2n = 18.

Tex.

Discussion

Dichanthelium pedicellatum grows on limestone outcroppings and in dry, open oak woodlands. Its range extends from Texas into Mexico and Guatemala. Primary panicles develop from late March into June (and sometimes from late August to November) and are open-pollinated; secondary panicles develop from May into fall and are at least partly cleistogamous.

Selected References

None.

Lower Taxa