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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Panicum oligosanthes
HABIT Perennial; caespitose. Culms 15–85 cm long. Culm-internodes distally glabrous, or pubescent, or hirsute. Culm-nodes glabrous. Lateral branches ample. Leaves heterophyllous with a basal winter rosette. Leaf-sheaths glabrous on surface, or hispid; with tubercle-based hairs; outer margin hairy. Ligule a fringe of hairs; 1–4.2 mm long. Leaf-blades lanceolate; 3–14 cm long; 3–12 mm wide. Leaf-blade surface glabrous, or pubescent.
INFLORESCENCE Inflorescence a panicle; terminal and axillary (vernal and autumnal respectively). Axillary inflorescences different from terminal (linear, 1–9 spikelets); enclosed.
Panicle open; ovate; 4–13 cm long. Panicle axis glabrous, or puberulous.
Spikelets solitary. Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic, or obovate; dorsally compressed; obtuse, or subacute; 2.9–4 mm long; 1.2–2.2 mm wide; falling entire.
GLUMES Glumes reaching apex of florets; thinner than fertile lemma. Lower glume ovate; 0.8–2.2 mm long; 0.25–0.5 length of spikelet; membranous; without keels; 1–3 -veined. Lower glume lateral veins absent, or obscure. Lower glume apex obtuse, or acute. Upper glume ovate; 1 length of spikelet; membranous; without keels; 5 -veined. Upper glume surface glabrous, or pubescent. Upper glume apex obtuse.
FLORETS Basal sterile florets barren; with palea. Lemma of lower sterile floret similar to upper glume; elliptic; 1 length of spikelet; membranous; 5 -veined; glabrous, or pubescent; obtuse. Palea of lower sterile floret 0.5 length of lemma. Fertile lemma ovate; dorsally compressed; 2.9–4 mm long; indurate; without keel. Lemma margins involute. Lemma apex obtuse. Palea involute; indurate.
FLOWER Anthers 3.
FRUIT Caryopsis with adherent pericarp.
DISTRIBUTION North America: western Canada, eastern Canada, northwest USA, north-central USA, northeast USA, southwest USA, south-central USA, southeast USA, and Mexico.
NOTES Paniceae. Gr Texas 1993.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
