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FOC | Family List | FOC Vol. 22 | Poaceae | Isachne

15. Isachne confusa Ohwi, Bull. Tokyo Sci. Mus. 18: 14. 1947.

紊乱柳叶箬 wen luan liu ye ruo

Perennial. Culms stiffly erect, 35–45 cm tall, unbranched, nodes widely spaced, glabrous. Leaf sheaths very short, much shorter than internodes and shorter than blade, slightly inflated, glabrous or setose; leaf blades lanceolate-ovate, thick, tough, 1–2.5 × 0.3–0.7 cm, veins many, riblike, abaxial surface minutely papillose, adaxial surface scabrid or hispidulous on veins, margins pectinate-setose, apex acuminate; ligule absent. Panicle broadly pyramidal, 1.5–4 cm, glandular; branches stiff, horizontally spreading, close-set, smooth; pedicels stout, shorter than or equaling spikelets. Spikelets globose, 1.2–1.3 mm, brownish green; florets similar; glumes shorter than florets, thickly membranous with broad scarious margins, lower glume 3-veined, upper glume 5-veined, densely hispid with thick hairs, apex rounded; lemmas strongly plano-convex, leathery, back minutely white-granular, margins scurfy-pubescent, lower lemma very slightly longer and narrower.

Shallow soil over rocks, swampy grasslands, lake and stream margins, sometimes in shallow water. Hong Kong [India (Nicobar Islands), Indonesia, Malaysia, Myanmar, New Guinea, Thailand, Vietnam; Australia].

This is a distinctive species with remarkably short leaf sheaths, exposing long lengths of internode, and a small, stiff panicle of horizontally tiered branches.


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