Tristachya] XXVIII. GRAMINEA, 217 
44, TRISTACHYA Nees ; Benth. & Hook. f. Gen. PI. iii. p. 1161. 
1. T. biseriata Stapf in Kew Bull. 1897, p. 295. 
Pungo Anponco.—Thicket-grown meadows near Sansamanda ; 
Feb. 1857, No. 2792. Open sandy woods between Caghuy and San- 
sumanda ; April 1857. No, 7387. 
2, T, Welwitschii Rendle sp. nov. 
Perennial, culms robust, erect, sheathed at the base, cauline 
internodes 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 linear-tapering, 
apex long drawn out, acute, faces roughly striate; 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. L, 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 # as long as the glume; gl. IV. on a short truncately 
conical white-haired callus, oblong, 7-nerved, awn 21 in., kneed 
below the middle, column twisted, pale linear, nerves strong, 
closely parallel. 
Plants 23 to 3 ft. high, the lower part of the basal sheaths and 
the lowest cauline node sparsely pubescent, otherwise glabrous. 
Leaves 5 to 14 in. long by 2 to 3 lines broad, ligule 3 line long. 
Panicle 6 to 84 in. long by 2 in. greatest width, branches 1 to 
3} 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 
82 lines long, gl. IT. 10 to 11 lines, gl. III. 9 lines, pale with 
conspicuous green nerves and notched apex, anthers 3 lines; 
gl. IV. on a short glabrous stalk 3 line long, callus 1 line, blade 
4 lines to point of divergence of awns, the median and alternate 
lateral nerves strong, the other four weak, lateral sete } in. 
long; pale 3+ line, the strong nerves diverging below the rounded 
emarginate tip, lodicules rather narrowly cuneate, } line long, 
ovary hairy on the top, style-arms hairy. 
Near 7. biseriata Stapf, but distinguished by its habit and 
glabrous outermost glume. 
Hvitia.—Thicket-grown sandy meadows in the Lopollo district ; 
April 1860. No. 2677. 
3. T.inamoena K. Schum. in Engl. Pfl. Ost-Afr. C., p. 109 (1895). 
Punco ANDONGO.—A ceespitose erect grass 4 to5 feet high. Plenti- 
ful in Panda forests, near Condo ; 3 March 1857. No. 7400. 
Hv1Ltia.—Wooded meadows of Monino but plentiful in only one 
locality, very rare elsewhere ; April, May, 1860. No. 2692. 
4, T. huillensis Rendle sp. nov. 
Perennial with a slender ascending rhizome; glabrous; culms 
densely cespitose, shortly stoloniferous at the base, erect, clothed 
below with the withered leaf-sheaths, cauline leaves 2, sheaths 
