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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 lutchuensis

HABIT Annual, or perennial; short-lived; caespitose; clumped loosely. Culms geniculately ascending; slender; 10–25 cm long; 0.5–0.8 mm diam.; rooting from lower nodes. Culm-internodes smooth; distally glabrous. Lateral branches sparse. Leaf-sheaths 1.5–3 cm long; mostly shorter than adjacent culm internode; glabrous on surface; outer margin glabrous. Leaf-sheath oral hairs scanty. Ligule a fringe of hairs. Leaf-blades lanceolate; 15–40 cm long; 3–7 mm wide; light green. Leaf-blade venation with 5–7 secondary veins. Leaf-blade surface glabrous. Leaf-blade margins unthickened; entire, or undulate. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; 2–5 cm long; 2–5 cm wide. Primary panicle branches ascending, or spreading; 1 -nate; 1–4.5 cm long; bearing 4–12 fertile spikelets on each lower branch. Panicle axis 4–7 noded.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform.

FERTILE SPIKELETS Spikelets comprising 2 fertile florets; without rhachilla extension. Spikelets orbicular, or obovate; dorsally compressed; 1–1.3 mm long; 0.8–1 mm wide; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes deciduous; similar; shorter than spikelet; thinner than fertile lemma. Lower glume lanceolate, or ovate; 0.8–0.9 length of spikelet; membranous; much thinner on margins; without keels; 5–9 -veined. Lower glume surface hispid; hairy above. Lower glume apex obtuse, or acute. Upper glume lanceolate, or ovate; 0.8–0.9 length of spikelet; membranous; with hyaline margins; without keels; 5–9 -veined. Upper glume surface hispid; hairy above. Upper glume apex obtuse, or acute.

FLORETS Fertile lemma elliptic, or ovate; 1–1.3 mm long; indurate; light green; without keel. Lemma lateral veins obscure. Lemma surface glabrous, or puberulous. Lemma margins involute. Lemma apex obtuse. Palea indurate; 2 -veined.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-temperate: eastern Asia.

NOTES Isachneae. Gr Japan 1997.

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