Isachne albomarginata

HABIT Perennial; caespitose; clumped loosely. Culms erect, or geniculately ascending; slender; 15–30 cm long. Culm-internodes 2–4 cm long; distally glabrous. Culm-nodes bearded. Leaf-sheaths 1–2 cm long; glabrous on surface, or pubescent; outer margin hairy. Ligule a fringe of hairs. Leaf-blades linear, or lanceolate; 3–5 cm long; 4–5 mm wide. Leaf-blade surface puberulous; hairy abaxially, or on both sides. Leaf-blade margins cartilaginous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; effuse; 3–5 cm long. Primary panicle branches ascending; 2–3 cm long. Panicle branches capillary; flexuous; smooth.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 2–3 mm long; tip rectangular.

FERTILE SPIKELETS Spikelets comprising 2 fertile florets; without rhachilla extension. Spikelets obovate; dorsally compressed; obtuse; 1–1.2 mm long; breaking up at maturity; disarticulating above glumes but not between florets.

GLUMES Glumes deciduous; similar; reaching apex of florets; thinner than fertile lemma. Lower glume ovate; 1–1.2 mm long; 1 length of spikelet; membranous; purple; without keels; 5 -veined. Lower glume lateral veins obscure. Lower glume surface glabrous. Lower glume apex obtuse. Upper glume ovate; 1.5 mm long; 0.9 length of spikelet; membranous; purple; without keels; 5 -veined. Upper glume lateral veins obscure. Upper glume surface glabrous. Upper glume apex obtuse.

FLORETS Fertile lemma ovate; 1–1.2 mm long; cartilaginous; without keel. Lemma surface puberulous. Lemma margins involute. Lemma apex obtuse. Palea cartilaginous.

FLOWER Anthers 3.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-tropical: Malesia and Papuasia.

NOTES Isachneae. Jansen 2001.

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