Dichanthelium linearifolium
Dichanthelium depauperatum
linear-leaf panicgrass, linear-leaf rosette-panicgrass, panic à feuilles linéaires, slim-leaf rosette grass, slimleaf panicgrass, slimleaf panicum
panic appauvri, starved panic grass, starved rosette-panicgrass
10-50 cm, very slender, erect to drooping, lower 3-8 internodes telescoped together, less than 2 cm, upper 2 internodes elongated;
nodes bearded;
internodes pubescent to almost glabrous;
fall phase developing a dense mass of erect blades and foreshortened branches arising from the basal nodes, terminating in small, narrow secondary panicles that are enclosed within the sheaths, with 6-15 spikelets.
10-45 cm, erect to spreading, lower 4-10 internodes telescoped together, less than 2 cm, upper 2 internodes elongated;
nodes bearded;
internodes pubescent to subglabrous;
fall phase a dense mass of erect blades and foreshortened branches that arise from the basal culm nodes, about 54 of the branches sterile, others with small, narrow, secondary panicles of 3-7 spikelets that remain enclosed within the sheaths.
2-4;
sheaths longer than the internodes, glabrous or pilose with dense, fine, papillose-based hairs;
ligules about 0.5 mm;
blades 5-20 cm long, 2-5 mm wide, stiffly ascending to erect, green to grayish-green, glabrous or densely pilose, apices long-tapering, lower blades shorter than the upper 2 or 3 blades.
2-4;
sheaths longer than the internodes, glabrous or densely ascending-pilose;
ligules about 0.5 mm;
blades 6-15 cm long, 1-4 mm wide, green to grayish-green, sometimes involute, glabrous or densely pilose, apices long-tapering, lower blades small to vestigial, upper 2 or 3 blades longer and stiffly erect.
2-3.2 mm long, 0.8-1.4 mm wide, ellipsoid, not turgid, sparsely pubescent.
3.2-4.3 mm long, 1-1.7 mm wide, ellipsoid-pointed, glabrous or finely pubescent.
0.6-1.1 mm, ovate-triangular;
upper glumes and lower lemmas exceeding the upper florets by about 0.2 mm before flowering, subequal in fruit, slightly pointed at maturity, upper florets 1.7-2.3 mm, ovoid-ellipsoid, minutely umbonate.
1.2-1.6 mm, narrowly triangular;
upper glumes and lower lemmas exceeding the upper florets by 0.2-1 mm, forming a pointed beak, upper florets 1.9-3.1 mm, obovoid, minutely umbonate.
rosettes poorly differentiated;
blades similar in shape to the lower cauline blades, narrow, ascending.
rosettes poorly differentiated;
blades similar in shape to the lower cauline blades, narrow, ascending.
panicles 4-10 cm long, 2-6 cm wide, long-exserted, with 12-70 spikelets;
branches and pedicels spreading.
panicles 3-6 cm long, 1.5-3 cm wide, usually long-exserted (sometimes contracted and remaining basal), with 7-25 spikelets.
= 18.
= 18.
Dichanthelium linearifolium
Dichanthelium depauperatum
Dichanthelium linearifolium grows in dry, open woodlands, rock outcroppings, and sandy areas. It is restricted to the Flora region. The primary panicles are briefly open-pollinated, produced from May to early June; the secondary panicles are cleistogamous, produced from late June through July (rarely in fall). Plants in the northern United States and Canada tend to be shorter and more spreading, subglabrous, and to have spikelets 2-2.6 mm long; they have been called Panicum werneri Scribn., but do not merit taxonomic recognition. In the southwestern part of its range, especially in the Ozarks, most plants of D. linearifolium are tall, erect, densely pilose, with very elongated blades and spikelets often 2.6-3 mm long; they may hybridize with D. perlongum.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Dichanthelium depauperatum grows in dry, open woodlands and open, disturbed areas, especially on sand. It is restricted to the Flora region. The primary panicles, which are rarely open-pollinated, are produced from May to early June; the secondary, cleistogamous panicles are produced from late June through July (rarely in fall). The species is linked with D. perlongum and D. linearifolium by occasional hybrids and hybrid derivatives. In the northern United States and Canada, 80-90% of the plants are glabrous and have been called Panicum depauperatum var. psilophyllum Fernald, P. depauperatum var. involutum (Torr.) Alph. Wood, or, if the primary panicles remain near the base, P. depauperatum forma cryptostachys Fernald; in this treatment, none of these is recognized as a distinct taxonomic entity. The frequency of pilose plants increases southward, where some populations are entirely pilose.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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