Isachne langkawiensis

HABIT Perennial; caespitose. Culms geniculately ascending, or decumbent; slender; 15–40 cm long. Leaf-sheaths 1 cm long; pilose; with tubercle-based hairs; outer margin hairy. Ligule a fringe of hairs. Leaf-blades lanceolate; 2–8 cm long; 2–9 mm wide. Leaf-blade surface pilose; hairy on both sides; with tubercle-based hairs. Leaf-blade margins cartilaginous; scabrous; ciliate; hairy at base. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle; comprising 30 fertile spikelets.

Panicle open; ovate; 5–12 cm long; 4 cm wide.

Spikelets solitary. Fertile spikelets pedicelled; heteromorphic (distal hairy).

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets orbicular; dorsally compressed; 2 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes deciduous; similar; shorter than spikelet; thinner than fertile lemma. Lower glume ovate; 1.6 mm long; 1 length of upper glume; 1 length of spikelet; membranous; without keels; 3(–5) -veined. Lower glume surface glabrous. Lower glume apex obtuse. Upper glume ovate; 1.4 mm long; 1 length of adjacent fertile lemma; membranous; purple; without keels; 5 -veined. Upper glume surface glabrous, or pilose; with tubercle-based hairs. Upper glume apex obtuse.

FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret elliptic; 1.8 mm long; membranous; glabrous; obtuse. Fertile lemma orbicular; 1.4 mm long; coriaceous; without keel. Lemma surface pubescent. Lemma margins involute. Lemma apex obtuse. Palea coriaceous; 2 -veined.

FLOWER Anthers 1.2 mm long.

DISTRIBUTION Asia-tropical: Malesia.

NOTES Isachneae. Gilliland 1997.

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