Isachne brassii

HABIT Perennial. Culms decumbent; weak; 8–50 cm long; rooting from lower nodes. Culm-internodes distally glabrous. Lateral branches sparse. Leaf-sheaths glabrous on surface to pubescent; outer margin hairy. Ligule a fringe of hairs; 1–2 mm long. Leaf-blades lanceolate, or oblong; 1.5–7 cm long; 3–8 mm wide. Leaf-blade surface scabrous; rough on both sides; glabrous, or pilose; sparsely hairy.

INFLORESCENCE Inflorescence a panicle.

Panicle open; elliptic; 3–10 cm long; contracted about primary branches. Primary panicle branches ascending.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 2 fertile florets; without rhachilla extension. Spikelets orbicular; tilted on the pedicel; dorsally compressed; 1.5–1.7 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes flattened.

GLUMES Glumes deciduous; similar; reaching apex of florets; thinner than fertile lemma. Lower glume obovate; 1.5–1.7 mm long; 1 length of upper glume; 1 length of spikelet; membranous; without keels. Lower glume surface glabrous, or hispidulous. Lower glume apex obtuse. Upper glume obovate; 1.5–1.7 mm long; 1 length of adjacent fertile lemma; membranous; without keels. Upper glume surface glabrous, or hispidulous. Upper glume apex obtuse.

FLORETS Fertile florets with the lowest dissimilar. Lowest fertile lemma 1.05 length of adjacent lemma; thinner than adjacent lemma (slightly). Fertile lemma elliptic, or orbicular; 1.5–1.7 mm long; coriaceous; shiny; without keel. Lemma surface glabrous. Lemma margins involute. Lemma apex obtuse. Palea coriaceous; 2 -veined.

DISTRIBUTION Asia-tropical: Malesia and Papuasia.

NOTES Isachneae. Reeder 1997.

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