^18 XXVIII. GRAMiNE.K. [Tvistachya 



membranous, several times shorter than the much elongated 

 slender terete internodes ; ligule a dense row of veiy short whitish 

 hairs ; blades convolute, setaceous, erect, shorter than the inter- 

 nodes ; panicle subnutant, often subumbellate, branches slender, 

 wiry, flexuose, bearing 2 or 3 golden-brown spikelets Avhich are 5 

 lines long without the awn ; outer glumes equal, the length of the 

 spikelet, membranous and acuminate in the upper third, the 

 lower lanceolate, tuberculate and bi-istly on the lateral nerves, 

 the upper elliptical, glabrous; gl. III. elliptic-oblong, tapering 

 above to the minutely apiculate apex, 3-nerved, one or both lateral 

 nerves with a few small bi'istle-tubercles about the middle, fertile 

 gl. on a slender long-haired callus, involute, when flattened oblong 

 from a truncate base narrowing at the apex, 7-nerved, awn short, 

 geniculate at the base, springing between two short, triangular, 

 acute, membranous auricles ; pale narrow-linear, lodicules mem- 

 branous, subspathulate with triangular, dentate apex ; ovary 

 densely hairy above. 



Specimen 2^ ft. high ; lower cauline leaf 5 to 7 lines long, 

 ^ line in (Uameter. Panicle cai-ried fai- above the leaves, 2 to 

 2^ in. long, with 6 to 9 flower-heads, common pedicels 5 to 9 

 lines long, with clavate apex ; outer glumes 5 lines ; gl. III. 

 4i line long ; callus hairs below gl. IV. half the length of the 

 glume, which is scarcely 3^ lines long, colourless below, becoming 

 golden-yellow at the apex, the three parallel median nerves 

 passing into the awn-base, the lateral pairs into the auricles, 

 awn greenish-yellow, ?r in. long ; pale scarcely 3 lines. 



A very distinct little species nearest to T. inamoena K. Schum., 

 hut distinguished by habit, congested panicle, glabrous pedicels, 

 and shorter awns. 



HuiLLA.— Damp meadows at Lake Ivantala ; Feb. 1860. No. 7501. 



Tribe viii. ARUNDINEjE. 



45. TRICHOON Roth in Roem. Arch. Botan. i. 3, p. 37 (1798). 



Phragmites Trin. Fund. Agrost. p. 134 (1820), pro parte; 

 Benth. & Hook. f. Gen. PI. iii. p. 1179. 



1. T. Phragmites. 



Arundo Phragmites L. Sp. PI. 81 (1753). Phragmites commuv,- 

 tsTrin., I.e.; Steud. Svn. PI. Gram. p. 195 (1854). P. vulgaris 

 Crep. Man. Fl. Belg.'ed. ii. p. 345 (186G); Durand & Schinz, 

 Consp. Fl. Afr. v. p. 876. 



Ami'.aca.— A grass tl to 10 feet high, with the habit of Arundo 

 D(i/Hfx, densely csespitose, glaucous green, with a woody tuberculed 

 rhizome. Flowers were sought in vain. Very plentiful near streams. 

 (Pamba, etc.) round Ngomba ; in fl. Oct. 1856. No. 7318- 



PuN'Go Andongo.— Muta Lucala ; March 1857. No. 2802 (in part). 

 In gravel on dried-up rivers. Cuanza ; Nov. 1850. No. 2802c. The 

 following numbers with immature spikelets should probably be 

 included. A grass 8 to 15 ft. high, culms bristling below with spiny 

 sheaths. Plentiful near the banks of the river Cuanza ; Sansamanda, 

 Feb. 1857. No. 2802 (in part). A very high grass, 20 ft. and more. 



