Aristida] XXVIII, GRAMINEA. 205 
MossamEpEs.—Annual, denselyand widely ceespitose, with a Bromoid 
habit, culms very lax, decumbent, awns generally purplish. On the 
sterile heights around the presidium where Porto de Pinda stands ; 
30 August 1859. No. 2612. 
8. A. papposa Trin. & Rupr., /.c., p. 173; Steud., dc.; Durand 
& Schinz, J.c., p. 805. 
Loaxpa.—The appearance of this grass when moved by the wind is 
that of undulating liquid silver. Plentiful on grassy hills, in rather 
dry coarse sandy soil, near Quicuxe and Mutollo, tinging wide areas 
with a shining silver colour (also found near Maianga do Povo) ; May 
1854. No. 7456. Nos. 7356, 73562, v, d. 
9. A. prodigiosa Welw. in Trans. Linn. Soc, xxvii. p. 80, t. 25 
(1869); Durand & Schinz, ic., p. 807. 
MossaMEvDEs.—1 to 3 ft. high, perennial by a fleshy rhizome, some- 
times annual, root-fibres numerous, white, villous, succulent, radical 
leaves slightly cespitose, glaucous, filiform, striate, rigidulous, variously 
falcate, culms unbranched, ascending, glaucous, tinged with dark- 
purple at the nodes, awns elongated, plumose. Very plentiful in 
coarse sandy places by the sea to five to six miles from the ocean from 
Giratil as far as Bahia dos Tigres below Cabo Negro; in fl. and fr. 
almost the whole year. Affords excellent fodder for antelopes, hares, 
and cattle. Typical form with hirsute glumes, Praia da Amelia ; 
June 1859. No. 2000u. Form with glabrous glumes. Plentiful in 
sandy valleys between Cazimba and Mossamedes, 4 Sept. ; between 
Mossamedes and Praia da Amelia, July ; in the sandy, now almost dry, 
bed of the river Caroca (commonly called Eroque), Cabo Negro, 
beginning of Sept. 1859. No. 20000. Conu. Carp. 1107 (no notes). 
Subtribe IT. Agrostew. 
33. CALAMAGROSTIS Adans. ; Benth. & Hook. f. Gen. PI. iii. 
p. 1150. 
1. C. Welwitschii Rendle sp. nov. 
Perennial (%), culms cespitose, erect, or base ascending, un- - 
branched, elongated cauline internodes 4, glabrous, subcompressed, 
the lowest shorter than the loose membranous scabrous sheath, 
the upper exceeding their sheaths; nodes glabrous, well-marked ; 
ligule large, scarious, truncate; blade flat, linear-tapering, acute, 
ascending, scabridulous-striate, glabrous; panicle elongated, 
narrow, lax,rhachis and branches scabridulous, branches verticillate 
or fascicled, flexuosely ascending to suberect, filiform, the lower 
part bare, the upper bearing several shorter densely flowered 
branchlets; spikelets on short pedicels; barren glumes lanceolate, 
acute, l-nerved, with scabridulous keel, the lower slightly the 
longer ; fertile gl. a little less than the upper barren gl., ovate, 
truncate, 4-nerved, glabrous, unawned, enveloped by a tuft of 
hairs almost equal to it in length borne by the callus, enclosing a 
similar but narrower pale ; anthers 3, pale brown, apiculate. 
Plants 2 ft. or a little more in height; elongated internodes 
increasing upwards 13 to 5 in., reaching 1 line in width, with 
leaf-sheaths a little over 1 to 3} in.; ligule 2 to 22 lines; 
blades 24 to 43 in. long by 1} line or less in width. Panicle 
