Aristida

(from the article `Africa`) ...and abundantly. The stony and rocky expanses give more hold for plants than do the vast areas of shifting sands. In some areas with slightly more ... ...of tropical grassland. For millennia human populations have put many demands on the region, so that its present condition is quite unlike its ... [2 re...
Found on http://www.britannica.com/eb/a-z/a/100

Aristida

The grass genus Aristida is distinguished by having three awns (bristles) on each lemma of each floret. The genus includes about 300 species found worldwide, often in arid warm regions. This genus is among those colloquially called three-awns `wiregrasses`, `speargrasses` and `needlegrasses`. Aristida stems are ascending to erect, with both ...
Found on http://en.wikipedia.org/wiki/Aristida
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