46 
CLYII. GRAMINE^ (Stapf). 
[ Urelytrum . 
the outer glume passing into a rough, more or less squarrose awn, up 
to 8-10 lin. long . — Rottbcellia agropyroides, Hack, in Bolet. Soc. Brot. 
iii. 135, t. 2, fig. 1, not. l.c. xvii. 47. 
Lower Guinea. Angola : Lobango ; near Humpata and Huilla, Newton ! 
4. U. coronulatum, Stapf. Perennial. Culms erect, rather 
robust, terete, smooth, glabrous. Leaf-sheaths somewhat loose, 
terete, keeled above, smooth, glabrous, striate’ (only the upper 
known) ; ligules membranous, truncate, sparingly ciliate, 1 lin. 
long ; blades linear, over 6 lin. long, 3 lin. wide, flat, sparingly hairy 
above, very rough along the edges, midrib whitish on both sides. 
Racemes in pairs, on peduncles which are about J lin. long, erect, 
rather stiff, glabrous, with the exception of the calli ; joints 3-3J lin. 
long., linear, slightly clavate above, with the back more or less 
rounded and prominently nerved, slightly concave on the inner face, 
quite smooth, disarticulating obliquely, scar with a scarious ciliate 
irregularly toothed coronulate appendage ; pedicels linear, much 
compressed, without an apical appendage, otherwise similar to the 
joints, subcontiguous with them, few-nerved. Sessile spikelets with 
slightly bearded obovate calli, with a deep transverse groove above 
it, including the callus 5 lin. long, linear-lanceolate, subacuminate, 
reddish straw-coloured or dull purplish-brown. Glumes equal, lower 
subcoriaceous, obscurely 2-toothed, rather flat on the back, keels 
spinulously ciliolate above the middle, intracarinal nerves 4-5, some 
of them more or less raised on the back, quite distinct on the inner 
side ; upper glume thinly chartaceous, narrowly boat-shaped, acute, 
3-nerved, keel rigidly ciliolate above, lateral nerve close to the 
glabrous margin. Lower floret : valve hyaline, lanceolate-linear, 
acute, 34 lin. long, ciliolate, finely 3-nerved with a similar 2-nerved 
valvule. Upper floret : valve and valvule very like those of the 
lower floret. Anthers 2 lin. long. Stigmas 2 lin. long. Pedicelled 
spikelets more or less reduced, sometimes containing 2 florets, with 
rudimentary £ flowers or rudimentary valves only, the outer glume 
similar to that of the sessile spikelet but smaller and tapering into a 
scabrid squarrose awn, about 1 in. long. 
Nile Land. Uganda : Buddu, in dry alluvial sands, Scott Elliot, 7459 ! 
5. U. giganteum, Pilger in Engl. Jahrb. xxxiv. 125 (1904). 
Perennial. Culms very stout, up to nearly 3 lin. thick. Leaf- 
sheaths tight, slightly rough, finely striate, glabrous ; ligules mem- 
branous, truncate, over 1 lin. long, glabrous ; blades linear, tapering 
almost from the base, up to 1 J ft. long, about 5 lin. wide at the base, 
very firm, more or less rough above, less so below, very scabrid 
along the edges. Racemes about 10 on a common axis, which is 
about 3 in. long and more or less angular above and slightly rough, 
