Dichanthelium strigosum
Dichanthelium nodatum
cushion-tuft panicgrass, roughhair rosette grass
sarita panicgrass, sarita rosette grass
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.
20-65 cm, decumbent to ascending even in spring, with hard, cormlike bases;
nodes puberulent to sparsely pubescent;
internodes scabrous-puberulent to papillose-hirsute;
fall phase with geniculate to 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.
8-14;
sheaths not overlapping, puberulent to papillose-hirsute, margins ciliate;
ligules 0.1-1 mm, of hairs;
blades 3-9 cm long, 4-8 mm wide, thick, firm, puberulent, sides parallel above the rounded to truncate bases, margins with papillose-based cilia.
1.1-2.1 mm, obovoid to broadly ellipsoid, glabrous or pubescent, hairs not papillose-based.
3.4-4.4 mm long, 1.3-1.6 mm wide, narrowly obovoid-obpyriform, finely pubescent, hairs papillose-based, bases long, narrow.
1/3 - 1/2 as long as the spikelets, acute to obtuse;
upper florets 0.8-1.7 mm, ellipsoid, subacute.
1.5-2 mm, attached about 0.2 mm below the upper glumes, partly or completely encircling the pedicels;
upper glumes about 0.3 mm shorter than the upper florets, purplish at the bases;
lower florets sterile;
upper florets with pointed, 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 3-13 cm long, 2-8 cm wide, exserted;
branches ascending to divaricate at maturity;
pedicels appressed.
, pers.
., 2001).
= 18 (J.
Dichanthelium strigosum
Dichanthelium nodatum
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 nodatum grows in oak savannahs near the Gulf coast from Texas to northeastern Mexico. The primary panicles are produced from April into June (sometimes late August to November) and are at least partly open-pollinated; the secondary panicles are produced 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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