Dichanthelium leibergii
Dichanthelium strigosum
Leiberg's panicum, Leiberg's rosette grass, leibergs panicgrass
cushion-tuft panicgrass, roughhair rosette grass
24-80 cm, glabrous or puberulent;
nodes sparsely, spreading-pilose;
internodes mostly elongated, glabrous or puberulent;
fall phase with a few suberect branches from the lower and midculm nodes, blades slightly reduced, secondary panicles partially exserted.
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.
3-4;
sheaths not overlapping, with ascending papillose-based hairs;
ligules 0.3-0.5 mm, membranous, ciliate, cilia longer than the membranous portion;
blades 5-15 cm long, 7-13 mm wide, ascending to erect, sparsely to densely pubescent with papillose-based hairs, with 9-11 prominent major veins and 25-50 minor veins, bases truncate to cordate, margins with papillose-based cilia.
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.
6-10 cm long, 3-5 cm wide, their length usually less than twice their width, eventually well-exserted, with 20-40 spikelets;
branches spreading to ascending.
3.3-3.8 mm long, 1.6-2 mm wide, ellipsoid-obovoid, turgid, pubescent, hairs papillose-based, apices rounded.
1.1-2.1 mm, obovoid to broadly ellipsoid, glabrous or pubescent, hairs not papillose-based.
about 1.8 mm, narrowly triangular;
lower florets staminate;
upper florets mucronate.
1/3 - 1/2 as long as the spikelets, acute to obtuse;
upper florets 0.8-1.7 mm, ellipsoid, subacute.
rosettes well-differentiated;
blades few, small, ovate to lanceolate.
rosettes poorly differentiated;
blades 1-5 cm, lanceolate, grading into the cauline blades.
panicles short- to long-exserted;
rachises and branches often pilose.
= 18.
Dichanthelium leibergii
Dichanthelium strigosum
Dichanthelium leibergii grows primarily on prairie relics, but is occasionally found in sandy woodlands. It is restricted to the Flora region. The primary panicles are produced from mid-May through July, the secondary panicles from late June to September. Sterile putative hybrids with D. acuminatum and D. xantho-physum are occasionally found.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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.)
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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