164 CLXXIII. GRAMINEJE. (J. D. Hooker.) \_Coelarthron. 



a solitary erect spike ; lowest pair on the spike imperfect ; joints of 

 rachis shorter than the sessile spikelet, clavate, tubular, tip truncate 

 open, mouth entire compressed. Sessile spikelets dorsally flattened ; callus 

 very short, bearded ; gl. I ovate-oblong, tip narrowly truncate, dorsally 

 glabrous with a deep median channel, margins narrowly indexed above 

 broadly incurved below, keels subpectinately ciliate above the middle ; II 

 cymbit'orm, 1-nerved, awned ; III oblong, 1-nerved ; IV very small, 2-fid, 

 3-nerved, awn slender, twisted; palea minute. Lodicules 2, cuneate- 

 quadrate. Stamens 3. Styles 2. Grain fusiform. Pedicelled spikelets = \ 

 the sessile or less, male or neuter gls. 2-3, not awned ; pedicel linear, flat. 



A remarkable grass, differing from Andropogon in the secund spikelets, hollow 

 joints of 'the rachis, deeply channelled gl. I of the sessile spikelet (as in Sect. Sehima 

 oflschamum), and the reduced pediceiled spikelets. 



C. Brandisii, Hook.f. in Hook. Ic. Plant, ined. 



BURMA ; high ground, generally with Teak, Brandis. 



Stems very weak, branching, struggling, rooting -at the node?, white ; with 

 ascending filiform 1 2-leaved flowering branches. Leaves 12 by ^ in., inserted 

 on the sheath by a mere point j acute or acuminate at both ends, membranous, 

 flaccid, surfaces and margins quite smooth, midrib and nerves very slender ; sheath 

 glabrous ; ligule oblong, obtuse. Spike 1-1 in., strict or incurved, quite white. 

 Senile spikelets % in. ; gl. I with a strong median keel on the ventral surface; IE 

 notched at the tip, awn as long as the gl. or shorter, very slender, recurved ; III 

 flat, ciliate; awn of IV f in., very slender, geniculate, column brown twisted, upper 

 half very pale. 



53. ANDROPOGON, Linn. 



Grasses of various habit. Leaves usually narrow, bise rarely rounded 

 or cordate. Inflorescence of solitary binate digitate fascicled or panicled 

 spikes (which are sometimes reduced to 3 spikelets), rachis articulate, 

 nsnally fragile. Spikelets binate, ,a sessile fern, or bisexual, and a pedi- 

 ceiled male or neuter. Sessile spikelet 1-fld., glumes 4, I dorsally rarely 

 laterally more or less compressed, margins inflexed or incurved, usually 

 keeled ; II as long as I, usually laterally compressed, awned or not; III 

 hyaline, empty, 2-nerved or nerveless, epaleate ; IV hyaline, broad or 

 narrow, 2-fid and awned in the cleft or reduced to an awn more or less 

 dilated at the base, paleateor not. Lodicules cuneate-quadrate. Stamens 

 3. Stigmas laterally exserted. Grain free. Pedicelled spikelets various, 

 gls. 3-4, IV awnless. Species about 200, chiefly tropical. 



In this most difficult genus I have followed H-ackel as closely as I could, not 

 venturing to depart far from his grouping of the Indian species, to attempt which 

 with any prospect of success would demand a revision of the whole genus. Hackel's 

 two principal groups (Series), Isozygi and Heterozygi, unfortunately separate widely 

 subgenera of clo^e affinity in habit and in all other characters, except that adopted 

 to distinguish between these groups. Thus the first two or even 4 subgenera of 

 Isozt/gi are closely related to Cgmbopogon amongst Heterozygi, ;md not to those 

 that immediately follow thorn in the series. Added to this, on the one hand the 

 characters drawn from the form, sexuality, &c., of the lower sessile spikelets of the 

 Heternzygi as distinguishing them from those of Isozygi are often variable and very 

 difficult of detection ; and on the other hand the same characters do occur here and 

 there in several subgeuera of the latter group. With regai^l to Hackel's subgenera, 

 they appear to me to be on the whole well constructed and natural, though often 

 depending on characters', some inconstant, others difficult of detection or appreciation. 

 Of the best defined I should, following older authors, have preferred to have treated 



