Dichanthelium boscii

(Poir.) Gould & C.A. Clark
Common names: Bosc's panicgrass Panic de bosc
Endemic
Synonyms: Panicum boscii var. molle Panicum boscii
Treatment appears in FNA Volume 25. Treatment on page 412.

Plants forming small clumps, with knotty rhizomes less than 2 mm thick. Basal rosettes well-differentiated; sheaths pubescent; blades ovate to lanceolate, dark green. Culms 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. Cauline leaves 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, ovatelanceolate, glabrous, puberulent, or pilose, with 11-15 major veins and 40-120 minor veins, bases cordate, margins with papillose-based cilia. Panicles 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. Spikelets 3.8-5.2 mm long, 1.7-2.2 mm wide, narrowly ellipsoid, pubescent or puberulent. Lower glumes 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. 2n = 18,36.

Distribution

Conn., N.J., N.Y., Del., W.Va., Fla., Tex., La., Tenn., N.C., S.C., Pa., Va., D.C., Ala., Ark., Ill., Ga., Ind., Md., Kans., Okla., Ohio, Mo., Miss., Ky., Mass., R.I.

Discussion

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 some¬times again in the fall); the secondary panicles are partly open-pollinated, and are produced from July through September.

Selected References

None.

Lower Taxa

None.

"usually distinctly longer and narrower" is not a number."decumbent" is not a number.No values specified.

... more about "Dichanthelium boscii"
rounded +  and attenuate +
anatomy +  and kranz +
Mary E. Barkworth +
(Poir.) Gould & C.A. Clark +
1 (?) +  and 3 (?) +
keeled +  and rounded +
well-differentiated +
pseudopetiolate +  and branching +
divergent +  and parallel +
intravaginal +, extravaginal +, branching +  and basal +
puberulent +  and retrorsely pilose +
cordate +
swelling +
disarticulating +  and pseudopetiolate +
non-radiate +  and radiate +
distinct +
pilose +, puberulent +  and glabrous +
ovatelanceolate +, ovate +  and lanceolate +
reduced +
1.5 cm15 mm <br />0.015 m <br /> (4 cm40 mm <br />0.04 m <br />) +
spikelike +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
not developed +
terete +  and compressed +
papillose-based +
Bosc's panicgrass +  and Panic de bosc +
rebranching +
not dense +
25 cm250 mm <br />0.25 m <br /> (75 cm750 mm <br />0.75 m <br />) +
Conn. +, N.J. +, N.Y. +, Del. +, W.Va. +, Fla. +, Tex. +, La. +, Tenn. +, N.C. +, S.C. +, Pa. +, Va. +, D.C. +, Ala. +, Ark. +, Ill. +, Ga. +, Ind. +, Md. +, Kans. +, Okla. +, Ohio +, Mo. +, Miss. +, Ky. +, Mass. +  and R.I. +
capillary +
germination +
pistillate +  and staminate +
sometimes longer +
compressed +  and terete +
shorter or longer +
subtending +
unequal +
membranous +
papillose-based +
uncinate +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Oval (?) +  and Round (?) +
bracteate +  and ebracteate +
pilose +  and glabrous +
transitional +
cauline +  and basal +
coriaceous +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
membranous +
inconspicuous +
1/3 +  and 1/2 +
complex +  and simple +
concealed +  and prominent +
2 +  and 1 +
4cm +  and 12cm +
subterranean +
partially included +  and tardily exserted +
dry +  and fleshy +
membranous +
0 cm0 mm <br />0 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
not overlapping +
not viscid +
in triplets +  and paired +
0.38 cm3.8 mm <br />0.0038 m <br /> (0.52 cm5.2 mm <br />0.0052 m <br />) +
puberulent +  and pubescent +
16 +  and 60 +
unisexual +  and bisexual +
ellipsoid +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.52 cm5.2 mm <br />0.0052 m <br />) +
1.7mm +  and 2.2mm +
1 +  and 3 +
fused +  and free +
2 +  and 3 +
dome--shaped +  and triangular +
Panicum boscii var. molle +  and Panicum boscii +
Dichanthelium boscii +
Dichanthelium sect. Macrocarpa +
species +
membranous +
chartaceous-indurate +
11 (?) +  and 15 (?) +
aquatic +  and terrestrial +
dioecious +, monoecious +  and synoecious +