Dichanthelium linearifolium
Dichanthelium boscii
linear-leaf panicgrass, linear-leaf rosette-panicgrass, panic à feuilles linéaires, slim-leaf rosette grass, slimleaf panicgrass, slimleaf panicum
Bosc's panic grass, Bosc's rosette-panicgrass, panic de Bosc
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.
25-75 cm, initially erect, often sprawling in the fall, nodes densely retrorsely bearded;
internodes glabrous, or pilose with papillose-based hairs;
fall phase branching from the midculm nodes, branches nearly erect, sparsely rebranching, blades and secondary panicles only slightly reduced.
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.
4-6, often with a transitional leaf above the basal rosette;
sheaths not overlapping, bases puberulent to retrorsely pilose, margins ciliate, collars pubescent;
ligules 0.4-0.9 mm, membranous, ciliate, cilia longer than the membranous portion;
blades 3-6 times longer than wide, 15-40 mm wide, ovate-lanceolate, glabrous, puberulent, or pilose, with 11-15 major veins and 40-120 minor veins, bases cordate, margins with papillose-based cilia.
4-12 cm long, 4-12 cm wide, about as long as wide when fully expanded, partially included to tardily exserted, with 16-60 spikelets.
2-3.2 mm long, 0.8-1.4 mm wide, ellipsoid, not turgid, sparsely pubescent.
3.8-5.2 mm long, 1.7-2.2 mm wide, narrowly ellipsoid, pubescent or puberulent.
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.
1/3 – 1/2 as long as the spikelets, narrowly triangular;
upper glumes shorter than the spikelets;
lower florets usually staminate;
upper florets pointed, with a minute tuft of hairs.
rosettes poorly differentiated;
blades similar in shape to the lower cauline blades, narrow, ascending.
rosettes well-differentiated;
sheaths pubescent;
blades ovate to lanceolate, dark green.
panicles 4-10 cm long, 2-6 cm wide, long-exserted, with 12-70 spikelets;
branches and pedicels spreading.
= 18.
= 18,36.
Dichanthelium linearifolium
Dichanthelium boscii
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 boscii usually grows in semi-open areas in dry oak-hickory woods of the eastern United States. The primary panicles are open-pollinated and are produced from late April through June (and sometimes again in the fall); the secondary panicles are partly open-pollinated, and are produced from July through September.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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