Flora of North America species comparison

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Dichanthelium strigosum

cushion-tuft panicgrass, roughhair rosette grass
Habit Plants densely cespitose.
Culms

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.
Cauline leaves

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.
Spikelets

1.1-2.1 mm, obovoid to broadly ellipsoid, glabrous or pubescent, hairs not papillose-based.
Basal

rosettes poorly differentiated;

blades 1-5 cm, lanceolate, grading into the cauline blades.
Primary

panicles short- to long-exserted;

rachises and branches often pilose.
Lower

glumes 1/3 - 1/2 as long as the spikelets, acute to obtuse;

upper florets 0.8-1.7 mm, ellipsoid, subacute.

Dichanthelium strigosum
Distribution
from FNA
AL; FL; GA; LA; MS; NC; SC; TN; TX; VA; PR
[WildflowerSearch map]
[BONAP county map]
Discussion

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.)
Key
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
Source FNA vol. 25, p. 446.
Parent taxa Poaceae > subfam. Panicoideae > tribe Paniceae > Dichanthelium > sect. Strigosa
Sibling taxa
D. aciculare, D. acuminatum, D. boreale, D. boscii, D. chamaelonche, D. clandestinum, D. commutatum, D. consanguineum, D. depauperatum, D. dichotomum, D. ensifolium, D. erectifolium, D. latifolium, D. laxiflorum, D. leibergii, D. linearifolium, D. malacophyllum, D. nodatum, D. nudicaule, D. oligosanthes, D. ovale, D. pedicellatum, D. perlongum, D. polyanthes, D. portoricense, D. ravenelii, D. scabriusculum, D. scoparium, D. sphaerocarpon, D. tenue, D. wilcoxianum, D. wrightianum, D. ×anthophysum
Subordinate taxa
D. strigosum subsp. glabrescens, D. strigosum subsp. leucoblepharis, D. strigosum subsp. strigosum
Synonyms Panicum strigosum
Name authority (Muhl. ex Elliott) Freckmann
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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