Isachne dioica

HABIT Annual. Culms decumbent; weak; 10–20 cm long. Lateral branches sparse, or ample. Leaf-sheaths mostly shorter than adjacent culm internode; glabrous on surface, or pubescent. Ligule a fringe of hairs; 0.5 mm long. Leaf-blades ovate; 0.7–1.6 cm long; 3–7 mm wide; stiff. Leaf-blade surface pilose. Leaf-blade margins scabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; oblong; 2–4 cm long. Primary panicle branches ascending, or spreading, or reflexed; 0.5–1 cm long.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 1.8–2 mm long; breaking up at maturity; disarticulating above glumes but not between florets. Rhachilla internodes elongated below proximal fertile floret.

GLUMES Glumes deciduous; similar; shorter than spikelet; thinner than fertile lemma; gaping. Lower glume ovate; 1.3–1.5 mm long; 0.75 length of spikelet; membranous; without keels; 5 -veined. Lower glume surface hispidulous. Lower glume apex obtuse. Upper glume ovate; 1.3–1.5 mm long; 0.75 length of spikelet; membranous; without keels; 5 -veined. Upper glume surface hispidulous. Upper glume apex obtuse.

FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret elliptic; 1.8 mm long; membranous. Fertile lemma orbicular; 0.8 mm long; indurate; without keel. Lemma surface puberulous. Lemma margins involute. Lemma apex obtuse. Palea indurate; 2 -veined.

FLOWER Anthers 3; 1.5 mm long.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-tropical: Indo-China.

NOTES Isachneae. Swallen 1997.

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