Isachne clarkei

HABIT Annual. Culms erect, or geniculately ascending; 20–40 cm long; without nodal roots, or rooting from lower nodes. Leaf-sheaths smooth; glabrous on surface. Ligule a fringe of hairs. Leaf-blades lanceolate, or ovate; 2.5–9 cm long; 3–6 mm wide; membranous. Leaf-blade surface pubescent; sparsely hairy; hairy on both sides. Leaf-blade margins cartilaginous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; pyramidal; 5–7.5 cm long; 3–5 cm wide. Primary panicle branches 1–2.5 cm long. Panicle branches capillary.

Spikelets solitary. Fertile spikelets pedicelled.

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

GLUMES Glumes deciduous; similar; reaching apex of florets; thinner than fertile lemma. Lower glume ovate; 1 mm long; 1 length of spikelet; membranous; without keels; 5 -veined. Lower glume apex obtuse. Upper glume ovate; 1 mm long; 1 length of spikelet; membranous; without keels. Upper glume apex obtuse.

FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret ovate; 1 mm long; cartilaginous; scabrous. Fertile florets bisexual. Fertile lemma ovate; 1 mm long; cartilaginous; without keel. Lemma surface scabrous. Lemma margins involute. Lemma apex obtuse. Palea cartilaginous; 2 -veined.

FLOWER Anthers 3.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-temperate: China and eastern Asia. Asia-tropical: India, Indo-China, and Malesia.

NOTES Isachneae. Fl Assam 1993.

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