106 
Tribe v.—StTREPTATOER®. 
Sub-tribe 1.—Stipaceex. 
48. Aristida. | 49. Stipa. 
48, ARISTIDA. 
Spikelets one-flowered on filiform pedicels, or nearly sessile in a 
terminal panicle, the rhachis of the spikelet articulate above the two 
outer glumes. 
Glumes three, narrow; two outer usually persistent, keeled, empty, 
and unawned ; terminal or flowering glume narrow, rigid, rolled round 
the flower, entire: with a terminal trifid awn. 
Palea small, enclosed in the flowering glume. 
Styles distinct. 
Grain narrow, enclosed in the hard upper glume but free from it, 
the whole falling off with the stipes and awn as in Stipa. 
All Australian species glabrous, with convolute more or less subulate 
leaves. . 
Fungus found on Aristida sp.—Ustilago segetum, Bull. 
Section I.—Arthratherum.—Awn articulate on the glume, entire 
and spirally twisted below the branches ; flowering glume much shorter 
than the outer ones. 
Awn about 14 inches below the branches, which vary from 13 to 23 
inches 2. A, stipoides 
Awn } to 3-inch below the branches, which vary from 1 to 3inches 3. A. arenaria 
Section II.—Chextaria.—Awn not articulate, and divided to the 
glume into three branches, the glume itself when barren sometimes 
twisted, but not the awn ; flowering glume about as long or longer than 
the outer ones. 
Panicle short, broad and dense ; glumes 3 inch long; awnslong... 4. A. Behrianu 
Panicle branches very long, at length spreading, with few spikelets 
on long pedicels ; glumes at least 4 Finch long, 2c» Ac-dwerleeeee 5. A. leptopoda 
Panicle loose, at length pyramidal ; nlieks short ; outer glumes 
2 to 3 lines long ; flowering glume much longer; awns short... 6. A. vagans 
Panicle narrow, rather loose; outer glumes as long as the flower- 
ing one. 
Glumes scarcely 3 lines; awns under 3 inch long ............se0068 7. A. ramosa 
Glumes 4 to 5 lines long; awns ? to 1 inch long ... ........e.eeeee 8. A. calycina 
Panicle narrow, dense ; spikelets sessile and crowded on the short 
branches; glumes 3 lines, or the flowering one rather longer ; 
RMS: 47ROUG PUNE 525s. 4000» oa coisale's sees od dedas cab ee ark apace seshiee eee eeen Eee 9. A. depressa 
2. Aristida stipoides, R. Br. 
Botanical name.—Aristida, from the Latin arista, the beard of an 
ear of corn; stipoides, from two words, stipa, oidos (Greek for like, 
or similar to), signifying resembling the genus Stipa. 
