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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 bisulcatum

HABIT Annual. Basal innovations extravaginal. Culms decumbent; 30–50 cm long; compressible, or firm; 3–6 -noded; rooting from lower nodes. Culm-nodes glabrous. Lateral branches ample. Leaf-sheaths glabrous on surface; outer margin hairy. Ligule a ciliolate membrane; 0.5–0.75 mm long. Leaf-blades 2–15 cm long; 4–13 mm wide; light green. Leaf-blade midrib prominent beneath. Leaf-blade surface smooth, or scaberulous. Leaf-blade apex acute, or acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; 10–20 cm long; with spikelets clustered towards branch tips. Primary panicle branches spreading; 1–2 -nate; profusely divided. Panicle branches capillary.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.4–3 mm long.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate, or elliptic; dorsally compressed; compressed slightly; acute; 2.4–3 mm long; falling entire.

GLUMES Glumes reaching apex of florets; thinner than fertile lemma. Lower glume ovate; 0.5 length of spikelet; membranous; without keels; 3–5 -veined. Lower glume apex acute. Upper glume elliptic; 1 length of spikelet; membranous; without keels; 5 -veined. Upper glume apex acute.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret similar to upper glume; elliptic; 1 length of spikelet; membranous; 3–5 -veined; smooth, or scaberulous; acute. Fertile lemma elliptic; dorsally compressed; 2 mm long; indurate; pallid, or light brown; without keel. Lemma surface striate. Lemma margins involute. Lemma apex obtuse, or acute. Palea involute; indurate.

FLOWER Anthers 3.

FRUIT Caryopsis with adherent pericarp; oblong; black. Embryo 0.4 length of caryopsis.

DISTRIBUTION Asia-temperate: Soviet far east, China, and eastern Asia. Asia-tropical: India, Indo-China, and Malesia. Australasia: Australia.

NOTES Paniceae. Fl NSW 1993.

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