Dichanthelium leibergii
Dichanthelium wrightianum
Leiberg's panicum, Leiberg's rosette grass, leibergs panicgrass
Wright's panicgrass, Wright's rosette grass, Wright's rosette-panicgrass
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.
15-50 cm tall (rarely taller), 0.3-0.8 mm thick, delicate, erect or ascending;
nodes slightly swollen, often purplish or darker green than the internodes;
internodes usually puberulent;
fall phase branching profusely from the lower and midculm nodes, secondary branches and secondary panicles numerous, usually not greatly reduced.
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.
4-7;
sheaths mostly puberulent or glabrous, margins finely ciliate;
ligules 1.5-3 mm, of hairs;
blades 2-4.5 cm long, 2-5 mm wide, ascending or spreading, occasionally involute, finely appressed-pilose adaxially, puberulent abaxially, bases rounded, margins finely whitish-scabridulous.
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.
0.8-1.1 mm, ellipsoid to nearly ovoid, often purplish, puberulent or subglabrous, obtuse or subacute.
about 1.8 mm, narrowly triangular;
lower florets staminate;
upper florets mucronate.
1/4 - 1/3 as long as the spikelets, subacute;
upper glumes shorter than the lower lemmas;
lower florets sterile;
upper florets 0.7-0.9 mm, ellipsoid, subacute.
rosettes well-differentiated;
blades few, small, ovate to lanceolate.
rosettes well-differentiated;
blades ovate to lanceolate.
panicles 2.5-5.5 cm, 1/3 – 2/3 as wide as long, well-exserted;
rachises and branches glabrous or sparsely puberulent (at least basally); ultimate branchlets and pedicels glabrous, somewhat viscid.
= 18.
= 18.
Dichanthelium leibergii
Dichanthelium wrightianum
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 wrightianum grows in moist, sandy or peaty areas, low pine savannahs, bogs, the margins of ponds, and cypress swamps, in the coastal plain from Massachusetts to Texas and Florida, extending to Cuba, Mexico, Central America, and northern South America. Occasional specimens of Dichanthelium wrightianum, particularly those with subglabrous spikelets, closely resemble D. chamaelonche. Others suggest D. ensifolium, and a few unusually robust specimens closely approach D. acuminatum subsp. longiligulatum. All of these taxa often grow together in the same habitats.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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