Dichanthelium leibergii |
Dichanthelium boreale |
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Leiberg's panicum, Leiberg's rosette grass, leibergs panicgrass |
northern panicgrass, northern rosette-panicgrass, panic boreal |
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Habit | Plants cespitose, with knotty rhizomes no more than 2 mm thick. | Plants cespitose. |
Culms | 24-80 cm, glabrous or puberulent; nodes sparsely, spreading-pilose; internodes mostly elongated, glabrous or puberulent; fall phase with a few suberect branches from the lower and midculm nodes, blades slightly reduced, secondary panicles partially exserted. |
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. |
Cauline leaves | 3-4; sheaths not overlapping, with ascending papillose-based hairs; ligules 0.3-0.5 mm, membranous, ciliate, cilia longer than the membranous portion; blades 5-15 cm long, 7-13 mm wide, ascending to erect, sparsely to densely pubescent with papillose-based hairs, with 9-11 prominent major veins and 25-50 minor veins, bases truncate to cordate, margins with papillose-based cilia. |
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. |
Panicles | 6-10 cm long, 3-5 cm wide, their length usually less than twice their width, eventually well-exserted, with 20-40 spikelets; branches spreading to ascending. |
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Spikelets | 3.3-3.8 mm long, 1.6-2 mm wide, ellipsoid-obovoid, turgid, pubescent, hairs papillose-based, apices rounded. |
2-2.2 mm long, 0.8-1.3 mm wide, ellipsoid, usually reddish, shortly pubescent, subacute. |
Lower glumes | about 1.8 mm, narrowly triangular; lower florets staminate; upper florets mucronate. |
0.5-1 mm, triangular-ovate; lower florets sterile; upper florets slightly exceeding the upper glumes and lower lemmas, subacute. |
Basal | rosettes well-differentiated; blades few, small, ovate to lanceolate. |
rosettes well-differentiated; blades 2-4 cm, pubescent, reddish. |
Primary | panicles 5-11 cm long, 3-8 cm wide, ovoid, long-exserted, with 40-220 spikelets. |
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2n | = 18. |
= 18. |
Dichanthelium leibergii |
Dichanthelium boreale |
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Distribution |
IA; IL; IN; KS; MI; MN; MO; ND; NE; NY; OH; PA; SD; WI; AB; MB; ON; SK
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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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Discussion | Dichanthelium leibergii grows primarily on prairie relics, but is occasionally found in sandy woodlands. It is restricted to the Flora region. The primary panicles are produced from mid-May through July, the secondary panicles from late June to September. Sterile putative hybrids with D. acuminatum and D. xantho-physum are occasionally found. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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.) |
Source | FNA vol. 25, p. 416. | FNA vol. 25, p. 434. |
Parent taxa | Poaceae > subfam. Panicoideae > tribe Paniceae > Dichanthelium > sect. Macrocarpa | Poaceae > subfam. Panicoideae > tribe Paniceae > Dichanthelium > sect. Dichanthelium |
Sibling taxa | ||
Synonyms | Panicum leibergii | Panicum boreale var. michiganense, Panicum boreale |
Name authority | (Vasey) Freckmann | (Nash) Freckmann |
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