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Coleataenia rigidula (Bosc ex Nees) LeBlond  

No occurrences found

Family: Poaceae
redtop panicgrass, more...redtop panicgrass
[Panicum agrostoides var. condensum (Nash) Fernald, morePanicum agrostoides var. ramosius (C.Mohr) Fernald, Panicum condensum Nash, Panicum elongatum var. ramosius C.Mohr, Panicum rigidulum Bosc ex Nees, Panicum rigidulum var. condensum (Nash) Mohlenbr., Panicum rigidulum var. rigidulum]
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  • vPlants
  • Gleason & Cronquist
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The Morton Arboretum
Perennial herb, tufted 35 cm - 1.5 m tall Leaves: alternate, two-ranked. Sheaths keeled or compressed. Ligules to 3 mm long, membranous, erose (appearing unevenly cut or incised) along the margins or fringed with hairs. Blades 8 cm - 0.5 m long, 2 - 12 mm wide, folded or flat, parallel-veined, smooth or minutely rough, sometimes sparsely softly hairy basally. Inflorescence: a dense, branched arrangement of spikelets (panicle), terminal and axillary, 9 - 40 cm long, one-third to three-fourths as wide as long. Fruit: a caryopsis, indehiscent, enclosed within the persistent lemma and palea. Culm: stout, 35 cm - 1.5 m long, compressed. Spikelets: nearly stalkless, green and tinged purple or purple, 1.5 - 4 mm long, lance-shaped. Glumes: unequal, herbaceous. Lower glumes to three-fourths as long as spikelets, three-veined, midveins keeled. Upper glumes nearly equal to or slightly longer than lower lemmas, often spreading slightly apart at the apex, minutely rough at the apex, five-veined, midvein keeled. Lemmas:: Lower lemmas similar to and nearly equal to or slightly shorter than upper glumes, often spreading slightly apart at the apex, minutely rough at the apex, five-veined, midvein keeled. Upper lemmas clasping upper paleas for all their length, stiff, thick, shiny, with rolled-up margins on the upper surface. Paleas:: Lower paleas small, to two-thirds as long as lower lemmas, transparent. Upper paleas longitudinally lined. Florets:: Lower florets sterile. Upper florets bisexual, sometimes stalked, 1.5 - 2 mm long, 0.5 - 1 mm wide, to three-fourths as long as spikelets, pointed at the apex, shiny, with a tuft of minute hairs at the apex. Anthers three. Stigmas red.

Similar species: No information at this time.

Flowering: June to October

Habitat and ecology: Moist to wet areas.

Occurence in the Chicago region: native

Etymology: Panicum comes from the Latin word panis, meaning bread, or panus, meaning "ear of millet." Rigidulum means "somewhat rigid."

Author: The Morton Arboretum

Vascular plants of NE US and adjacent Canada
Coarse, densely tufted perennial to 1.5 m; lvs mostly crowded toward the base; sheaths glabrous, strongly compressed; ligule short, membranous, erose; blades narrow, 2-4 dm, sometimes exceeding the panicle, scaberulous on the margin; panicle 1-3 dm, pyramidal or narrow, its branches scabrous; spikelets lance-ovoid, green to purple, 1.8-3 mm, on pedicels half to twice as long; glumes and sterile lemma shortly to long-acuminate, sharply veined and somewhat keeled; first glume half to two-thirds as long as the spikelet; second glume and sterile lemma subequal, conspicuously longer than the often shortly stipitate fr; 2n=18. Wet soil; Me. to Mich., s. to Fla. and Tex. (P. agrostoides; P. condensum; P. stipitatum)

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
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