Isachne bourneorum

HABIT Perennial. Rhizomes elongated. Culms erect, or geniculately ascending; 10–80 cm long. Culm-nodes glabrous, or pubescent. Leaf-sheaths pilose; with tubercle-based hairs. Ligule a fringe of hairs. Leaf-blades lanceolate, or elliptic, or ovate; 1–6 cm long; 2–12 mm wide. Leaf-blade surface glabrous, or pubescent. Leaf-blade margins cartilaginous. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; 2–12 cm long. Primary panicle branches spreading.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels eglandular.

FERTILE SPIKELETS Spikelets comprising 2 fertile florets; without rhachilla extension. Spikelets ovate, or obovate; dorsally compressed; 3–4 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 ovate; 3–4 mm long; 1 length of spikelet; membranous; without keels; 7–9 -veined. Lower glume apex acuminate. Upper glume ovate; 3–4 mm long; 1 length of spikelet; membranous; without keels; 5–7 -veined. Upper glume surface pilose; with tubercle-based hairs. Upper glume apex acuminate.

FLORETS Fertile florets with the lowest dissimilar. Lowest fertile lemma oblong; 2–2.5 mm long; 1.5–1.8 length of adjacent lemma; lobed. Fertile lemma ovate, or orbicular; 1–1.5 mm long; coriaceous; without keel. Lemma surface puberulous. Lemma margins involute. Lemma apex obtuse. Palea coriaceous; 2 -veined. Palea surface puberulous.

FLOWER Anthers 3; 1–2 mm long.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-tropical: India.

NOTES Isachneae. Nair 1993.

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