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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Panicum antidotale

HABIT Perennial. Rootstock evident. Rhizomes short. Culms erect, or geniculately ascending; 30–180 cm long; woody. Culm-internodes distally pruinose. Culm-nodes swollen; glabrous, or pubescent. Lateral branches sparse. Ligule a fringe of hairs. Leaf-blades 6–30 cm long; 2.5–14 mm wide. Leaf-blade midrib conspicuous. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; oblong, or ovate, or pyramidal; 13–32 cm long; contracted about primary branches. Primary panicle branches not whorled, or whorled at most nodes; 5–15 cm long.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.5–2 mm long; scaberulous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; acute; 2.4–3.2 mm long; falling entire.

GLUMES Glumes reaching apex of florets; thinner than fertile lemma. Lower glume ovate; 0.6–0.66 length of spikelet; membranous; much thinner on margins; without keels; 3–5 -veined. Lower glume apex acute. Upper glume ovate; 1 length of spikelet; membranous; with hyaline margins; without keels; 7–9 -veined. Upper glume apex acute.

FLORETS Basal sterile florets barren; with palea. Lemma of lower sterile floret similar to upper glume; ovate; 1 length of spikelet; membranous; 7–9 -veined; acute. Palea of lower sterile floret 1 length of lemma. Fertile lemma oblong; dorsally compressed; 1.5–1.75 mm long; indurate; pallid; shiny; without keel. Lemma margins involute. Lemma apex acute. Palea involute; indurate.

FLOWER Anthers 3; 1–2 mm long.

FRUIT Caryopsis with adherent pericarp; oblong, or ovoid; 0.25 mm long.

DISTRIBUTION Africa: north and west-central tropical. Asia-temperate: western Asia and Arabia. Asia-tropical: India, Indo-China, Malesia, and Papuasia. Australasia: Australia. Pacific: southwestern, northwestern, and north-central. North America: Mexico. South America: Mesoamericana, western South America, and southern South America.

NOTES Paniceae. Fl Pak 1993.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.