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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Isachne jayachandranii

HABIT Annual; caespitose. Culms erect, or geniculately ascending; 25–50 cm long. Culm-internodes distally glabrous. Culm-nodes bearded. Leaf-sheaths 1–2.5 cm long; mostly shorter than adjacent culm internode; hispid. Ligule a fringe of hairs. Leaf-blades ovate; 1–3 cm long; 4–10 mm wide. Leaf-blade venation prominent (above); with 10–36 secondary veins. Leaf-blade surface hispid; densely hairy; hairy abaxially; with tubercle-based hairs. Leaf-blade margins scabrous. Leaf-blade apex acute, or acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; 2–4 cm long. Panicle axis hirsute.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1–3 mm long.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; 2.5–3.4 mm long; 2–2.5 mm wide; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes deciduous; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume ovate; 2.5–3.4 mm long; 1 length of spikelet; membranous; much thinner on margins; without keels; 7 -veined. Lower glume surface setose; hairy above. Lower glume margins ciliate. Lower glume apex acuminate. Upper glume obovate; 2.5–3 mm long; 1 length of spikelet; membranous; with hyaline margins; without keels; 7 -veined. Upper glume surface setose; hairy above and in lines. Upper glume apex caudate.

FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret elliptic, or ovate; 2.5 mm long; 1.6–1.7 length of fertile lemma; 5 -veined; obscurely veined; acute. Palea of lower sterile floret 2.5 mm long. Fertile lemma elliptic, or ovate; 1.5 mm long; 1 mm wide; coriaceous; without keel. Lemma surface puberulous. Lemma margins involute. Lemma apex acute. Palea ovate; 1 mm long; coriaceous.

FLOWER Lodicules 2; 0.2 mm long. Anthers 3; 1.5 mm long.

FRUIT Caryopsis with adherent pericarp; ovoid; plano-convex; 1 mm long; light brown.

DISTRIBUTION Asia-tropical: India.

NOTES Isachneae. Gopal & Chandras 2005).

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