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Published In: Species Plantarum 2: 1049. 1753. (1 May 1753) (Sp. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 6/2/2011)
Acceptance : Accepted
Project Data     (Last Modified On 6/3/2011)
General/Distribution: A genus of about 60 species in the Old World tropics, mainly in Asia, but a few species in tropical America; 2 species occur in Pakistan.
Comment/Acknowledgements: The male lower floret, though awkward to use, provides the best distinction between Ischaemum and Andropogon. A helpful additional character in many species is the U-shaped appearance of the intemode and pedicel seen from the back of the raceme. Ischaemum is a difficult genus reaching its greatest complexity in Southeast Asia where some serious biosystematic work badly needs doing.

Ischaemum timorense Kunth has been reported from Pakistan (see Grasses W. Pak. 1:133) but no herbarium specimens are available for confirmation. In this species the margins of the lower glume of the sessile spikelet are expanded below the middle, not inturned; the glume is perfectly smooth on the back and 2.5-3 mm long.


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Perennials, often decumbent, sometimes annuals. Leaf-blades linear; ligule membranous. Inflorescence of paired or digitate racemes, the former often inter-locked back to back, terminal or axillary, internodes and pedicels clavate to inflated. Sessile spikelet dorsally compressed, the callus obtuse and inserted into the concave tip of the internode; lower glume chartaceous to coriaceous, convex to concave, laterally 2-keeled, sometimes winged; upper glume awned or not; lower floret male with a palea; upper lemma bifid, passing between the teeth into a glabrous awn (rarely awnless). Caryopsis oblong to lanceolate, dorsally compressed. Pedicelled spikelet as large as the sessile or much smaller, often asymmetrical.

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1 Lower glume of sessile spikelet with deep ridges across the back in the lower part Ischaemum rugosum
+ Lower glume of sessile spikelet smooth across the back or faintly rugose, usually nodular on the margins Ischaemum molle
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