Isachne vulcanica

HABIT Perennial. Culms decumbent; 10–20 cm long; rooting from lower nodes. Leaves distichous. Leaf-sheaths pilose. Ligule absent. Leaf-blade base broadly rounded. Leaf-blades lanceolate; 1.5–3.5 cm long; 4–8 mm wide; stiff. Leaf-blade surface glabrous, or pilose; sparsely hairy; hairy abaxially. Leaf-blade margins scabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; 3–4 cm long; bearing few spikelets. Primary panicle branches spreading; 1 -nate; simple; 0.5–1 cm long; bearing 2–3 fertile spikelets on each lower branch; bearing spikelets almost to the base.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1.5 mm long.

FERTILE SPIKELETS Spikelets comprising 2 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 3 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes deciduous; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume oblong; 3 mm long; 1 length of spikelet; membranous; without keels; 5 -veined. Lower glume surface puberulous; hairy above. Lower glume apex obtuse. Upper glume oblong; 3 mm long; 1 length of spikelet; membranous; without keels; 5 -veined. Upper glume surface puberulous; hairy above. Upper glume apex obtuse.

FLORETS Fertile lemma elliptic, or oblong; 2 mm long; coriaceous; without keel. Lemma surface pubescent. Lemma margins involute. Lemma apex obtuse. Palea coriaceous; 2 -veined.

FLOWER Anthers 3.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-tropical: Malesia.

NOTES Isachneae. Merrill 1994.

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