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, ovate-lanceolate, 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.

... more about "Dichanthelium boscii"
Mary E. Barkworth +
(Poir.) Gould & C.A. Clark +
Bosc's panicgrass +  and Panic de bosc +
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. +
Panicum boscii var. molle +  and Panicum boscii +
Dichanthelium boscii +
Dichanthelium sect. Macrocarpa +
species +