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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 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.