Home Flora of Pakistan
Home
Name Search
Families
Genera
Species
District Map
Grid Map
Inventory Project
Ischaemum L. Search in The Plant ListSearch in IPNISearch in Australian Plant Name IndexSearch in Index Nominum Genericorum (ING)Search in NYBG Virtual HerbariumSearch in JSTOR Plant ScienceSearch in SEINetSearch in African Plants Database at Geneva Botanical Garden Decrease font Increase font Restore font
 

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.


 

Export To PDF Export To Word
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.
 

Export To PDF Export To Word Export To SDD
Switch to indented key format
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
 
 
© 2014 Missouri Botanical Garden - 4344 Shaw Boulevard - Saint Louis, Missouri 63110