Tristachyci] xxvtii. gramine.e. 217 



44. TRISTACHYA Nees ; Benth. & Hook. f. Gen. PI. iii. p. 1 161 . 



1. T. biseriata 8tapf in Kew Bull. 1897, p. 295. 



PiNGo Andonco. — Thicket-grown meadows near Sanaamanda : 

 Feb. 1857. No. 2792. Open sandy woods between Caghuy and San- 

 samanda ; April 1857. No. 7387. 



2. T. Welwitschii Rendle sp. nov. 



Perennial, culms robust, erect, sheathed at the base, cauline 

 iiiternodes 3, including a short lower one, 2 to 3 times as long as 

 the closely enveloping cylindrical sheaths ; ligule a dense row of 

 white hairs ; blades narrowly linear-lanceolate or linoar-tapering, 

 apex long drawn out, acute, faces roughly sti'iate; panicle 

 narrowly obovoid. branches ascending, purplish, each with one 

 triplet 10 to 11 lines long ; spikelets glabrous, gl. I. rigidly coria- 

 ceous, golden-yellow, narrowly triangular acute, 3-nerved, flat 

 with narrowly incurved membranous edges; gl. II. longer than 

 gl. I., narrowly lanceolate, acuminate, 3-nerved, margin incurved 

 at the lateral nerves, involute above ; gl. III. similar but shorter, 

 5-nerved above the middle, marginal nerve double, pale lanceolate, 

 about H as long as the glume ; gl. IV. on a short truncately 

 conical white-haired callus, oblong, 7-nerved, awn 2] in., kneed 

 below the middle, column twisted, pale linear, nerves strong, 

 closely i^arallel. 



Plants 2|- to 3 ft. high, the lower part of the basal sheaths and 

 the lowest caulir^e node sparsely jjubescent, otherwise glabrous. 

 Leaves 5 to 14 in. long by 2 to 3 lines broad, ligule H line long. 

 Panicle 6 to 8^ in. long by 2 in. greatest width, branches 1 to 

 3f in. long, 3 to 7 at the lowest node, in pairs or solitary at the 

 next, solitary at the remaining two ; triplets 7 to 12. Gl. I. 8 to 

 8§ lines long, gl. II. 10 to 1 1 lines, gl. III. 9 lines, pale with 

 c^onspicuous green nerves and notched apex, anthers 3 lines; 

 gl, IV. on a short glabrous stalk ^ line long, callus 1 line, blade 

 4 lines to point of divergence of awns, the median itnd alternate 

 lateral nerves strong, the other four weak, lateral seta? }. in. 

 long; pale 3^ line, the strong nerves divei-ging below the rounded 

 emarginate tip, lodicules rather narrowly cuneate, .V line long, 

 ovary hairy on the top, style-arms hairy. 



Near T. biseriata Stapf, but distinguished by its habit and 

 glabrous outermost glume. 



HuiLi.A. — Thicket-grown sandy meadows in the Lopollo district : 

 April 1860. No. 2677. 



3. T. inamoena K. 8chum. in Engl. Pfl. Ost-Afr. C, p. 109 (1895). 

 PuN(;() And<)N(;<^ — Aca;spitose erect grass 4 to .5 feet high. Plenti- 

 ful in Panda forests, near Condo : 3 March 1857. No. 7400- 



Hrii.i.A. — Wooded meadows of Monino but plentiful in only one 

 locality, very rare elsewhere : April, May, 18()0. No. 2692. 



4. T. huillensis Ptendle sp. nov. 



Perennial with a slender ascending rhizome ; glabrous ; culms 

 densely csespitose, shortly stoloniferous at the ba.se, erect, clothed 

 below with the withered leaf-sheaths, cauline leaves 2, sheaths 



