Dichanthelium strigosum
Dichanthelium ×anthophysum
cushion-tuft panicgrass, roughhair rosette grass
pale panicgrass, panic jaunâtre
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.
20-55 cm, most forming in the spring additional culms sometimes produced in the fall;
nodes glabrous or sparsely ascending-pubescent;
internodes all elongated, glabrous or puberulent;
fall phase with a few suberect branches from the lower and midculm nodes, branches not rebranching, blades slightly reduced, secondary panicles partially exserted.
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.
3-4;
lower sheaths not overlapping, sometimes pubescent;
upper sheaths overlapping, sparsely to densely pubescent, hairs papillose-based, margins ciliate;
ligules 0.3-0.5 mm, membranous, ciliate, cilia longer than the membranous bases;
blades 7-17 cm long, 7-23 mm wide, erect, pale yellow-green to bluish-green, glabrous, with 7-11 prominent major veins and 30-110 minor veins, bases tapered or rounded to truncate, margins with papillose-based cilia.
7-14 cm long, 1-5 cm wide, their length usually more than twice their width, narrowly cylindric, eventually well-exserted, with 9-46 spikelets;
branches strongly ascending, stiff.
1.1-2.1 mm, obovoid to broadly ellipsoid, glabrous or pubescent, hairs not papillose-based.
3.2-4.1 mm long, 1.8-2.2 mm wide, obovoid, turgid, puberulent to subglabrous, with rounded apices.
1/3 - 1/2 as long as the spikelets, acute to obtuse;
upper florets 0.8-1.7 mm, ellipsoid, subacute.
1.7-2.2 mm, narrowly triangular;
lower florets staminate;
upper florets longer than the upper glumes, mucronate.
rosettes poorly differentiated;
blades 1-5 cm, lanceolate, grading into the cauline blades.
rosettes often poorly differentiated;
blades few, grading into the cauline blades.
panicles short- to long-exserted;
rachises and branches often pilose.
= 36.
Dichanthelium strigosum
Dichanthelium ×anthophysum
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 ×anthophysum usually grows on sandy or rocky soils in semi-open pine, oak, or aspen woodlands. It extends from eastern Saskatchewan and northeast Montana to Quebec, New England, and West Virginia. Plants from Minnesota and western Quebec approach D. leibergii in having cauline blades narrower than 10 mm, and papillose-based hairs. Sterile putative hybrids with D. leibergii and D. boreale are rare; those with D. boreale have been called Panicum calliphyllum Ashe.
(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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