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Taiwan Gramineae | Family List | Poaceae

Isachne R. Br., Prodr. 196. 1810.


Isachne kunthiana

Credit: CC Hsu, 1975 Taiwan Grasses

Annuals or perennials; culms hollow, ribbed, glabrous. Leaves often with tubercle-based hairs; ligule a fringe of hairs or obsolete; blades lanceolate or linear-lanceolate, acute, often prominently nerved. Inflorescence an open or contracted panicle, sometimes very small, branched on all sides, the apex rigid. Spikelets globose, always muticous, 2-flowered; rachilla articulated above glumes; glumes tardily deciduous, often separate, herbaceous, nearly equal, as long as spikelet or slightly shorter; lemmas differing in texture or equal in texture, distinctly spaced; lower lemma as firm as upper lemma, and convex, or less firm and scarcely convex, reaching as far as upper lemma or distinctly farther; upper lemma shorter, strongly convex, firm; stamens in staminate or bisexual florets 3, the anther linear; ovary glabrous; the styles 2, free, the stigma plumose, exserted apically, purple. Caryopsis plano-convex, free, enclosed between palea and lemma.

About 60 species distributed in the tropical and subtropical regions of the world.

Eight species, mainly growing at medium elevations in moist place, are found in Taiwan.


1 Florets dissimilar in shape and texture, the lower glabrous and papery, the upper pubescent and indurate; florets articulated with a small rachilla joint.   (2)
+ Florets more or less of the same shape and texture, both indurate and usually pubescent; florets almost continuous.   (3)
2 (1) Blades 1 cm wide, margins cartilaginously thickened   Isachne dispar
+ Blades 3-5 mm wide, margins slightly thickened   Isachne miliaceae
3 (1) Florets distinctly different in size, glabrous except on margins; glumes not bristled; pedicels usually with glandular bands   Isachne globosa
+ Both florets nearly the same in size and pubescence; glumes bristled at leaat on upper part.   (4)
4 (3) Panicle more than 10 cm long; medium sized grasses; culms tufted; blades linear.   (5)
+ Panicle up to 10 cm long; small grasses with prostrate culms; leaves broadly lanceolate to ovate.   (6)
5 (4) Spikelets pale; leaves 7-14 cm long, 6-11 mm wide   Isachne albens
+ Spikelets usually purplish or gseenish; leaves 3-7 cm long, 5 mm wide   Isachne beneckei
6 (4) Spikelets about 2 mm long; glumes scabrous and densely covered with bristles along nerves; panicle branches stout; blades margins hard and thickened   Isachne kunthiana
+ Spikelets less than 1.5 mm Iong; glumes glabrous on lower part, upper part bristled; panicle branches not stout.   (7)
7 (6) Panicle ovate, spikelets densely crowded on the branches; peducels smooth; blades 3-5 mm wide, usually hairy and without distintly thickened margins   Isachne myosotis
+ Panicle deltoid in form; pedicels scabrous; spikelets few on the branches; blades 7-15 mm wide, sparingly pilose with distinctly white, , thickened margins   Isachne nipponensis

Lower Taxa


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Flora of China  
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