Isachne petelotii

HABIT Perennial. Culms decumbent; 70–90 cm long. Culm-internodes distally glabrous. Leaf-sheaths pilose; with tubercle-based hairs. Ligule a fringe of hairs. Leaf-blade base broadly rounded. Leaf-blades lanceolate; 8–10 cm long; 8–10 mm wide. Leaf-blade surface pubescent; hairy abaxially. Leaf-blade margins scaberulous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate; dense; 12–18 cm long; 4–6 cm wide; contracted about primary branches. Primary panicle branches appressed; 1.5–6 cm long. Panicle axis angular. Panicle branches scabrous; bearded in axils.

Spikelets appressed; in pairs. Fertile spikelets pedicelled. Pedicels unequal; 1–1.5 mm long, or 5–6 mm long; scaberulous.

FERTILE SPIKELETS Spikelets comprising 2 fertile florets; without rhachilla extension. Spikelets oblong; dorsally compressed; 2.5 mm long; breaking up at maturity; disarticulating above glumes but not between florets.

GLUMES Glumes deciduous; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume ovate; 2.5 mm long; 1.4 length of spikelet; membranous; without keels; 3 -veined. Lower glume apex acute. Upper glume ovate; 2.4 mm long; 1.4 length of spikelet; membranous; without keels; 5 -veined. Upper glume surface puberulous; hairy at apex. Upper glume apex acute.

FLORETS Fertile lemma oblong; 1.7 mm long; coriaceous; without keel. Lemma surface puberulous. Lemma margins involute. Lemma apex obtuse. Palea coriaceous; 2 -veined. Palea surface puberulous.

FLOWER Anthers 3.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-tropical: Indo-China.

NOTES Isachneae. Camus 1997.

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