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Pakistan | Family List | Poaceae

Sporobolus R. Br., Prodr. 169. 1810. Boiss., Fl. Or. 5:511. 1884; Hook.f., Fl. Brit. Ind. 7:247. 1896; Blatter & McCann, Bombay Grasses 221. 1935 ; Bor, Fl. Assam 5:116. 1940; Sultan & Stewart, Grasses W. Pak: 2:259. 1959; Bor, Grasses Burma Ceyl. Ind. Pak. 623. 1960; Bor in Rech.f., Fl. Iran. 70:456. 1970; Tzvelev, Poaceae URSS 645. 1976; Hansen in Tutin et al., Fl. Fur. 5:257. 1980.

Annuals or perennials. Culms usually erect. Inflorescence a panicle, open or contracted, rarely spiciform, exserted from the uppermost sheath, the branches whorled or not. Spikelets small, fusiform, nearly always glabrous, awnless; palea 2-nerved. Fruit rounded or truncate at the tip, not beaked, the pericarp commonly swelling when wetted and ejecting the seed.

A genus of about 150 species mainly in the tropics and subtropics, with some species extending to warm temperate regions; 10 species occur in Pakistan.

A large genus not divisible into well defined sections, although clusters of closely allied species are readily apparent. Within the clusters, and to a lesser extent between them, the boundaries between species are seldom clear-cut, and the occurrence of intermediates appears to be the rule rather than the exception.


1 Panicle branches in whorls; panicle open or sometimes loosely contracted   (2)
+ Panicle branches not whorled, or with a single whorl at the base   (5)
       
2 (1) Annual   Sporobolus coromandelianus
+ Perennial   (3)
       
3 (2) Harsh tussocky desert grass; leaves glaucous, involute, stiff and pungent   Sporobolus arabicus
+ Not or rarely a desert grass; leaves glaucous or green, flat or loosely inrolled, stiff or soft, attenuate but not pungent   (4)
       
4 (3) Coastal grass; leaves glaucous, stiff, flat or loosely inrolled; spikelets 2.2-2.6(3) mm long   Sporobolus kentrophyllus
+ Grass of dryish or seasonally wet soils in the plains; leaves green, soft, flat; spikelets 1.5-2.2 mm long   Sporobolus ioclados
       
5 (1) Panicle dense, spike-like or with the spikelets clustered about the whole length of the primary branches; lateral pedicels 0.1-0.5 mm long, stout, appressed   (6)
+ Panicle loose and diffuse, or if with the spikelets clustered then the base of the primary branches bare   (8)
       
6 (5) Leaf-blades often involute, pungent; lower glume 3/5- 4/5 as long as the spikelet   (7)
+ Leaf-blades flat, not pungent; lower glume as long as the spikelet   Sporobolus helvolus
       
7 (6) Spikelets 1.9-2.5 mm long; leaf-blades up to 10 cm long and 4 mm wide; grain subglobose   Sporobolus virginicus
+ Spikelets 1.4-2.1 mm long; leaf-blades up to 3 cm long (rarely as long as 5 cm) and 0.4-1.7 mm wide; grain broadly oblong   Sporobolus tremulus
       
8 (5) Panicle diffuse, at least at maturity   (9)
+ Panicle contracted, subspiciform, interrupted   Sporobolus tourneuxii
       
9 (8) Spikelets 1.7-2.1 mm long, scattered; glumes acute; grain ellipsoid   Sporobolus nervosus
+ Spikelets 1.2-1.6 mm long, rather crowded; glumes obtuse; grain oblong, truncate at the tip   Sporobolus diander

Lower Taxa

Related Synonym(s):


 

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