GrassBase - The Online World Grass Flora


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

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

Panicum luzonense

HABIT Annual. Culms geniculately ascending; 10–120 cm long; without nodal roots, or rooting from lower nodes. Culm-nodes pubescent. Leaf-sheaths without keel; hispid; with tubercle-based hairs; outer margin hairy. Ligule a fringe of hairs; 1.5–2 mm long. Collar pubescent. Leaf-blades linear, or lanceolate; 18–25 cm long; 6–15 mm wide. Leaf-blade surface glabrous to hirsute; hairy on both sides. Leaf-blade margins smooth, or scaberulous; tuberculate-ciliate; hairy at base. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; 15–50 cm long. Primary panicle branches ascending, or spreading. Panicle branches smooth, or scaberulous; with scattered hairs, or glabrous; glabrous in axils, or pubescent in axils.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic, or oblong; dorsally compressed; 1.5–2.6 mm long; falling entire.

GLUMES Glumes dissimilar; shorter than spikelet, or reaching apex of florets; thinner than fertile lemma. Lower glume ovate; clasping; 0.5–1.1 mm long; 0.33–0.5 length of spikelet; membranous; without keels; 3–9 -veined. Lower glume apex obtuse, or acute. Upper glume ovate; 1.3–1.8 mm long; 0.8–1 length of spikelet; membranous; without keels; 7–9 -veined. Upper glume apex obtuse, or acute.

FLORETS Basal sterile florets male, or barren; with palea. Lemma of lower sterile floret similar to upper glume; ovate; 1.5–2.6 mm long; 1 length of spikelet; membranous; 5–9 -veined; obtuse, or acute. Palea of lower sterile floret 1 length of lemma. Fertile lemma elliptic; dorsally compressed; 1.3–2.2 mm long; indurate; shiny; without keel; 5 -veined. Lemma margins involute. Lemma apex obtuse. Palea involute; indurate.

FLOWER Anthers 3; 1 mm long.

FRUIT Caryopsis with adherent pericarp; obovoid; 1.4 mm long.

DISTRIBUTION Asia-temperate: China and eastern Asia. Asia-tropical: India, Indo-China, Malesia, and Papuasia. Australasia: Australia. Pacific: northwestern.

NOTES Paniceae. Fl Ceyl 1996.

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