Dichanthelium boreale |
Dichanthelium scoparium |
|
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northern panicgrass, northern rosette-panicgrass, panic boreal |
velvet panicum, velvety panicgrass, velvety rosette-panicgrass |
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Habit | Plants cespitose. | Plants in small clumps, with rhizomes 3-5 mm thick. |
Culms | 18-75 cm, usually more than 1 mm thick, occasionally delicate, erect or ascending; nodes glabrous; internodes glabrous; fall phase with decumbent culms, branches arising from the lower and midculm nodes, rebranching 2-3 times, with small blades and secondary panicles compared to those on the culms, secondary panicles with 8-10 spikelets, partially included at maturity. |
50-150 cm, usually robust, erect; nodes often swollen, densely bearded with thin retrorse hairs above a constricted, glabrous, viscid ring; internodes grayish-purple, velvety-pubescent; fall phase branching from the mid- and upper culm nodes, with long, repeatedly forking and often recurving branches, ultimately with fascicles of reduced blades and included secondary panicles. |
Cauline leaves | 3-5; sheaths shorter than the internodes, lower sheaths pubescent, upper sheaths glabrous, margins of all sheaths sparsely ciliate; ligules about 0.5 mm, of hairs; blades 5-11 cm long, 5-13 mm wide, thin, spreading to erect, usually glabrous, rarely pubescent abaxially, always glabrous adaxially, bases truncate to cordate, ciliate on the margins, blades of the flag leaves erect or ascending. |
7-11; sheaths not overlapping, narrowing distally, lustrous, bases sparsely to densely retrorsely villous, hairs papillose-based, summits purplish, with yellowish spots; collars densely villous; ligules 0.5-2 mm, of hairs; blades 9-20 cm long, 9-20 mm wide, thick, densely soft pubescent, bases rounded to subcordate, margins ciliate basally. |
Spikelets | 2-2.2 mm long, 0.8-1.3 mm wide, ellipsoid, usually reddish, shortly pubescent, subacute. |
2.2-2.8 mm long, 1.3-1.5 mm wide, ovoid-ellipsoid, often purplish basally, prominently veined, margins and apices sparsely to densely pubescent, hairs papillose-based. |
Lower glumes | 0.5-1 mm, triangular-ovate; lower florets sterile; upper florets slightly exceeding the upper glumes and lower lemmas, subacute. |
0.6-1.3 mm, subtruncate to acuminate; lower florets sterile; upper florets minutely apiculate. |
Basal | rosettes well-differentiated; blades 2-4 cm, pubescent, reddish. |
rosettes well-differentiated; blades sometimes more than 10 cm, lanceolate. |
Primary | panicles 5-11 cm long, 3-8 cm wide, ovoid, long-exserted, with 40-220 spikelets. |
panicles 6-16 cm long, 5-12 cm wide, well-exserted, dense; rachises softly pubescent basally; branches often mottled with purplish viscid spots, glabrous. |
2n | = 18. |
= 18. |
Dichanthelium boreale |
Dichanthelium scoparium |
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Distribution |
CT; DC; GA; IA; IL; IN; KY; MA; MD; ME; MI; MN; MO; NC; NH; NJ; NY; OH; PA; RI; TN; VA; VT; WI; WV; LB; NB; NS; ON; PE; QC
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AL; AR; CT; DC; DE; FL; GA; IL; IN; KS; KY; LA; MA; MD; MI; MO; MS; NC; NJ; NY; OK; PA; RI; SC; TN; TX; VA; PR
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Discussion | Dichanthelium boreale grows in open woodlands and thickets, wet meadows, and fields. It is restricted to the Flora region. The primary panicles are mostly open-pollinated and are produced in May and June; the secondary panicles are predominantly cleistogamous and are produced from mid-June into October. Dichanthelium boreale occasionally hybridizes with D. acuminatum and D. xanthophysum, producing a sterile triploid sometimes called Panicum calliphyllum Ashe. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Dichanthelium scoparium grows in moist, sandy, open, often disturbed areas of the southeastern United States. It is also present in the West Indies. The primary panicles are open-pollinated, produced from May to early August; the secondary panicles are cleistogamous and are produced from July through October. Panicum glutinoscabrum Fernald may represent rare putative hybrids of Dichanthelium scoparium with D. acuminatum, and P. mundum Fernald, rare hybrids with D. dichotomum. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 25, p. 434. | FNA vol. 25, p. 419. |
Parent taxa | Poaceae > subfam. Panicoideae > tribe Paniceae > Dichanthelium > sect. Dichanthelium | Poaceae > subfam. Panicoideae > tribe Paniceae > Dichanthelium > sect. Clandestina |
Sibling taxa | ||
Synonyms | Panicum boreale var. michiganense, Panicum boreale | Panicum scoparium |
Name authority | (Nash) Freckmann | (Lam.) Gould |
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