229 
Andropogon.] clvii. gramineje (Stapf). 
12. A. leucostachyus, H. B. & K. Nov. Gen. et Sp. i. 187. 
Perennial, densely tufted. Culms 1-3 ft. high, slightly compressed 
below, glabrous, few- to 5- or more-noded, simple to one-third or more 
usually to or beyond the middle. Leaf-sheaths glabrous, firm, 
those of the innovations and at the base of the culms much compressed 
and keeled, the remainder more or less terete or keeled only upwards 
and usually at length shorter than the internodes ; ligules 
membranous, very short, truncate, minutely ciliolate ; blades linear, 
shortly acute, very gradually passing into the sheath, tightly folded 
or sometimes flat, glabrous, rarely hairy to villous, pale or dull 
green, usually also smooth along the margin, midrib slender, lateral 
nerves fine and close. Inflorescence a subfastigiate or elongated 
and interrupted spatheate panicle ; tiers few, rarely more than 4, 
usually 2-rayed, the lower often mixed ; spathes lanceolate to linear- 
lanceolate, acuminate, with or without small rudimentary blades, 
greenish or tinged with purple, glabrous, at length tightly inrolled : 
rays filiform, strict, erect, glabrous, if compound their lower inter- 
node up to over 6 in. long. Spatheoles similar to the spathes, up 
to 2 in. long ; peduncle at length usually exserted from the spatheole, 
or of the outermost rays permanently shorter. Bacemes in sub- 
digitate corymbs of 2-5, slender, 1-2 in. long, densely silky-plumose, 
erect ; joints finely filiform, shorter than the spikelets, silky with soft 
long (about 4-5 lin.) hairs ; pedicels similar, more or less curved. Sessile 
spikelet very narrow, almost linear, when seen from the back, 1 1 lin. 
long, pale green or slightly tinged with purple ; callus very short, 
long-bearded. Glumes unequal, membranous, acute; the lower 
nerveless and sunk between the scaberulous somewhat stout keels ; 
upper glume equalling two-thirds or three-quarters of the upper, 
broadly boat-shaped, mucronulate, 1 -nerved, scabrid on the keel, 
ciliate upwards. Lower floret reduced to an oblong subacute 
hyaline obscurely 2-nerved reversedly ciliate valve about £ lin. 
long. Upper floret ^ : valve similar to the lower but narrower 
and 1-nerved, awnless or with a minute hair-like bristle ; valvule very 
narrow, oblong, ciliate at the tips, up to J lin. long. Anthers -J—f lin. 
long. Grain fusiform, over j lin. long. Pedicelled spikelet reduced 
to a subulate scaberulous glume, up to \ lin. long. — Hitchcock in 
Contrib. U.S. Nat. Herb. xii. 193 and xvii. 205 ; Nash in North 
Amer. FI. xvii. 118. A. leucostachyus , subsp. genuinus, subvar. 
typicus, Hack, in DC. Monogr. Phan. vi. 420 ; Durand & Schinz, 
Consp.Fl. Afr. v. 717. A.lanuginosus , H. B. & K. l.c. A. virginicus , 
Trin. in Mem. Acad. Petersb. 6 me scr., ii. 269 ; Hack, in Mart. FI. 
Bras. ii. iii. 285 ; not of Linn. Sp. PI. ed. i. 1046. A. Diana, Steud. 
Syn. PI. Glum. i. 371 ? A. domingensis, Fourn. Mex. PL Gram. 61. 
Anatherum virginicum , Spreng. Pug. ii. 16, partly ; Nees, Agrost. 
Bras. 322. A. domingense, Boem. & Schult. Syst. ii. 809. Euh- 
lastaxon tenuifolius, Steud. Syn. PL Glum. i. 412. 
