162 
clyii. GKAMiNEiE (Stapf). [ Chryso'pogon . 
branches rarely much over £ in. long, their tips elegantly fulvously bearded ; 
pedicels up to 2 lin. long, conspicuously ciliate, cilia fulvous, up to over 1 lin. 
long. Sessile spikelets pale or purplish, excluding the callus 2-2\ lin. long ; 
callus fulvously bearded. Glumes rather thinner and relatively wider than in 
the preceding form. Plumose awns 2-3^ lin. long ; perfect awn over 1 lin. long. 
Pedicelled spikelets mostly purplish, 2 lin. long. — C. Aucheri, var. quinqueplumis, 
Stapf in Kew Bulletin, 1907, 211 (the Somaliland specimens). Andropogon 
Aucheri, var. quinqueplumis, Chiov. in Ann. Istit. Bot. Roma, vi. 164, not of 
Hackel. 
Nileland. British Somaliland : Habr Awed, Bobecchi ; between Peres Sogairand 
Berbera, Bobecchi ; Little Bohotle and from Gararo to Upper Sheikh, Appleton !! 
Golis Range, Drake- Brockman, 153 ! Upper Sheikh, Drake- Brockman, 558 ! 
According to Appleton and Drake -Brockman an excellent fodder (vern. 
Daremo), requiring very little water. A barren specimen from Sokotra 
(8 'chweinfurth, 560 !) has the same habit but longer leaves (up to 1^ in.) and 
also appears to belong to this variety. 
C. Aucheri seems to comprise several geographical races, the one from which 
the species was originally described extending from Arabia (S chweinfurth > 
Exped. Risbeck, 203 !) through Southern Persia and Beluchistan to Scind. It 
is characterised by the lower glume of the pedicelled spikelet being usually 
awnless or in any case much more shortly awned than the upper, by the glume - 
awns not being ciliate or ciliate only at the base, and by the longer beards of the 
pedicels. Hackel says that part of Schimper’s 726 from Jelajeranne represents- 
the type ; what I have seen of it is distinctly the variety quinqueplumis. 
32. ARTHRAXON, Beauv. Agrost. 111. 
Spikelets 2-nate, one sessile, the other pedicelled, similar or dis- 
similar (mainly owing to reduction), different in sex, or the spikelets 
solitary, sessile, with or without an accompanying often very rudi- 
mentary pedicel, on the fragile rhachis of digitate or racemosely digi- 
tate spike-like racemes or spikes, the sessile spikelets falling with the 
adjacent joint and pedicel ; disarticulation sometimes tardy, trans- 
verse ; joints filiform ; pedicels similar or more or less reduced. 
Florets 2, lower reduced to an empty valve, upper $ in the sessile,. 
$ or neuter in the pedicelled spikelets. Sessile spikelet laterally 
more or less compressed, usually awned. Glumes equal ; lower 
rounded on the back and the sides, ecarinate or apparently 2-carinate 
owing to the presence of seriate lateral rows of tubercles or spines, 
usually chart aceous to coriaceous, very rarely membranous, many- 
(5- to more-) nerved with the nerves percurrent and more or less 
equally distributed, very rarely approximately 2-nerved, usually 
scabrid to coarsely muricate ; upper glume much compressed, keeled 
upwards, thinner than the lower, 3-1- (rarely 5-) nerved. Valves 
hyaline, of lower floret 2-ner‘ved or nerveless, of upper subentire, 1- 
nerved, with a dorsal or sub-basal perfect or more or less reduced awn, 
very rarely muticous. Valvule minute, hyaline, nerveless, or more 
often 0. Stamens 2 or 3. Stigmas plumose, exserted laterally near 
the base. Grain narrowly linear, terete ; embryo half the length of 
the grain. Pedicelled spikelet, if fully developed, more or less like 
the sessile, but less rough, $ and always awnless, usually reduced in 
varying degrees or quite suppressed. — Usually slender, short grasses.. 
