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Paspalum setaceum var. rigidifolium

Paspalum setaceum var. rigidifolium (Nash) D. Banks  
Family: Poaceae
Stiff Paspalum
[Paspalum rigidifolium Nash]
Paspalum setaceum var. rigidifolium image
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Charles M. Allen, David W. Hall. Flora of North America

Plants erect to spreading. Leaves mostly cauline; blades to 30 cm long, 2.4-6.1 mm wide, conspicuously rigid, stiff, pubescent adaxially, glabrous or sparsely pubescent abaxially, margins sometimes ciliate. Panicle branches 4.8-11.3 cm; branch axes 0.7-1.1 mm wide. Spikelets 2-2.6 mm long, 1.6-1.8 mm wide, obovate to ovate, pubescent, sometimes sparsely so; lower lemmas with or without an evident midvein; upper florets 2-2.4 mm.

Paspalum setaceum var. rigidifolium grows on hammocks, sand barrens, high pinelands, and flatwoods of Georgia, Florida, and Cuba.

The Morton Arboretum
Perennial herb with short rhizomes or forming tufts 25 cm - 1 m tall Leaves: mostly consisting of stem leaves, alternate, two-ranked. Sheaths open, sometimes hairy. Ligules to 0.5 mm long, membranous. Blades rigid, to 30 cm long, 2.5 - 6 mm wide, lance-shaped, flat, parallel-veined, hairy above, sometimes sparsely hairy beneath, sometimes fringed with hairs. Inflorescence: a branched arrangement of spikelets (panicle), terminal and axillary, bearing one to six spike-like branches. Axillary panicles completely or partially enclosed by a subtending leaf sheath. Branches ascending to spreading, often bowed, 5 - 11 cm long, with spikelets mostly arranged in two rows along one side of the branch. Branch axes 0.5 - 1 mm wide, sometimes rough. Fruit: a caryopsis, indehiscent, enclosed within the persistent lemma and palea, white, elliptic to nearly orbicular. Culm: upright or spreading, 25 cm - 1 m long, round in cross-section, hollow. Nodes sometimes hairy. Spikelets: paired, overlapping, arranged along one side of the inflorescence branch, appressed to the branch axis, bearing two florets, straw-colored or brown, 2 - 2.5 mm long, 1.5 - 2 mm wide, plano-convex (one side flat, the other convex), egg-shaped to reverse egg-shaped, and hairy. Glumes:: Lower glumes absent. Upper glumes nearly equal to lower lemmas, rounded at the apex, three-veined, sometimes shortly glandular-hairy, membranous. Lemmas:: Lower lemmas nearly equal to upper glumes, rounded at the apex, sometimes shortly glandular-hairy, membranous, three-veined, with or without an evident midvein. Upper lemmas clasping the paleas, straw-colored to brown, convex, smooth to slightly wrinkled, with rolled-up margins on the upper surface. Paleas:: Lower paleas rudimentary or absent. Upper paleas straw-colored to brown, smooth to slightly wrinkled. Florets:: Lower florets sterile. Upper florets bisexual, straw-colored, 2 - 2.5 mm long. Anthers three. Stigmas red.

Similar species: No information at this time.

Flowering: June to September

Habitat and ecology: Sandy areas.

Occurence in the Chicago region: native

Etymology: Paspalum comes from the Greek word paspalos, a type of millet. Setaceum means bristle-like. Rigidifolium means "having rigid leaves."

Author: The Morton Arboretum

Paspalum setaceum var. rigidifolium
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Paspalum setaceum var. rigidifolium image
Paspalum setaceum var. rigidifolium image
Paspalum setaceum var. rigidifolium image
Paspalum setaceum var. rigidifolium image
Paspalum setaceum var. rigidifolium image
University of Florida Herbarium
Paspalum setaceum var. rigidifolium image
Paspalum setaceum var. rigidifolium image
University of Florida Herbarium
Paspalum setaceum var. rigidifolium image
Paspalum setaceum var. rigidifolium image
Paspalum setaceum var. rigidifolium image
Paspalum setaceum var. rigidifolium image
Paspalum setaceum var. rigidifolium image
Paspalum setaceum var. rigidifolium image
Paspalum setaceum var. rigidifolium image
Paspalum setaceum var. rigidifolium image
Paspalum setaceum var. rigidifolium image
Paspalum setaceum var. rigidifolium image
Paspalum setaceum var. rigidifolium image
Paspalum setaceum var. rigidifolium image
Paspalum setaceum var. rigidifolium image
University of Florida Herbarium
Paspalum setaceum var. rigidifolium image
Paspalum setaceum var. rigidifolium image
Paspalum setaceum var. rigidifolium image
Paspalum setaceum var. rigidifolium image
Paspalum setaceum var. rigidifolium image
Paspalum setaceum var. rigidifolium image
Paspalum setaceum var. rigidifolium image
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