Dichanthelium strigosum
Dichanthelium pedicellatum
cushion-tuft panicgrass, roughhair rosette grass
cedar rosette grass, corm-based panicgrass
5-45 cm, slender, erect or spreading;
from a dense tuft of predominantly basal leaves, lower internodes short, upper 3-5 internodes elongate;
nodes glabrous or bearded;
internodes glabrous or pilose;
fall phase with spreading culms and branches arising from near the bases forming a dense, flat tuft.
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.
2-4;
lower cauline sheaths longer than the internodes, mostly glabrous or pilose with ascending hairs, margins finely ciliate;
ligules 0.2-2 mm, at low magnification appearing to be membranous and ciliate, at high magnification evidently of hairs that are coherent at the base;
blades 1.5-6 cm long, 3-8 mm wide, lanceolate, glabrous or softly pilose, margins with prominent papillose-based cilia, at least basally.
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.
1.1-2.1 mm, obovoid to broadly ellipsoid, glabrous or pubescent, hairs not papillose-based.
3.2-4.4 mm long, 1.3-1.6 mm wide, narrowly obovoid-ellipsoid, papillose-hirsute, attenuate to the purplish bases.
1/3 - 1/2 as long as the spikelets, acute to obtuse;
upper florets 0.8-1.7 mm, ellipsoid, subacute.
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.
rosettes poorly differentiated;
blades 1-5 cm, lanceolate, grading into the cauline blades.
rosettes absent.
panicles short- to long-exserted;
rachises and branches often pilose.
panicles 3-6 cm long, 2-4 cm wide, exserted;
branches spreading at maturity;
pedicels somewhat divergent.
= 18.
Dichanthelium strigosum
Dichanthelium pedicellatum
Dichanthelium strigosum extends from the southeastern Flora region south into Mexico, the Caribbean, and into northern South America.
The primary panicles are briefly open-pollinated in April or May; the secondary panicles, which are produced from May through November, are cleistogamous. The three subspecies are mostly sympatric and sometimes grow together, with occasional intergradation.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Spikelets pubescent, broadly ellipsoid, 1.6-2.1 mm long; lower glumes about 1/2 as long as the spikelets; blades glabrous | subsp. leucoblepharis |
1. Spikelets glabrous, obovoid, 1.1-1.8 mm long; lower glumes about 1/3 as long as the spikelets; blades pilose or glabrous. | → 2 |
2. Blades pilose; spikelets 1.1-1.6 mm long | subsp. strigosum |
2. Blades glabrous or sparsely pilose near the base; spikelets 1.4-1.8 mm long | subsp. glabrescens |
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