lhteraniliera\ xii. PONTEDERiACEyE. 67 



2. HETERANTHERA liuiz k Pavou ; Benth. & Hook. f. 

 Gen. PI. iii. p. 838. 



1. H. sp. 



CAZi;\(io. — A lacustrine plant with habit of Alhma or S,(iqittaria 

 laxly rooting in watery mud, acaulescent, scapigerous. with swimming 

 subpeltate leaves, petioles very long, septate. Margins of Lagoa de 

 Moambege near Dalatando. Flowers almost over, June 1855. No. 3015. 



Perhaps a new species of the genus ; but in the absence of flowers it 

 is impossible to say. The leaves are more or less orbicular with a 

 cordate base. 



3. MONOCHORIA Presl ; Benth. & nook. f. Gen. PI. iii. 

 p. 839. 



1. M. vaginalis Presl, Reliq. Ifenk. i. p. 128 (1827) ; Solms- 

 Laub. in DC. Men. Phan. iv. p. 524 (1883). 



PuN'Go Anpongo. — A perennial herb growing in marshes, with 

 membranous, green, swimming leaves. Ponds near Banza de Quitage. 

 Without fl. March 1857. No. 3013. 



Indistinguishable from the type, which has hitherto not been recorded 

 from Africa. 



XIII. XYRIDEiE. 

 1. XYRIS L. ; Benth. & Hook. f. Gen. PI. iii. p. 842. 



1. X. Unibilonis Nilss. in K. Svensk. Vet. Akad. Handb. xxiv. 

 No. 14, p. 30 (1892) ; Durand & Schinz, Consp. Fl. Afr. v. p. 421. 



PuNGo AxDOXGo. — A perennial widely csespitose herb, 2 to 2h ft. 

 high : stem and leaves glaucous, rigidulous ; flower-spikes ovoid- 

 cylindrical, dark-brown, flowers yellow. Damp meadows by the 

 banks of the Cuanza near Bumba. In fl. and fr. March 1857. No. 2460. 



Huii.LA. — Spongy marshes at the foot of Serra de Oiahoia, Humpata. 

 Towards the end of April 1860. No. 2475. 



The Angolan specimens differ from the South African in their 

 slightly narrower sepals and the greater extent of the non-polished 

 area in the upper half of the bract, but the differences are insufficient 

 for specific distinction. 



2. X. rigidescens Welw. ms. in herb. 



Glabrous, leaves rigid, flattened, linear, taj^ering rapidly above 

 to the shortly pungent apex, sheath very broad and reddish-brown 

 below, narrowing upwai'ds ; peduncles far exceeding the leaves, com- 

 pressed, sheath broadly linear, reddish-brown to the middle, leafless, 

 ending abruptly in a sharp stiff apiculus ; spikes subglobose ; lower 

 bracts very tough and leathery, orbicular to very broadly oblong, 

 concave, becoming keeled below the strongly apiculate apex, dirty 

 brown with thinner straw-coloured entire edges, upper half with a 

 circular submuriculate area ; becoming broadly ovate, less rigid 

 and less deeply coloured above ; shorter than the lateral sepals 

 which are suboblong when opened out, with sides of a pale 

 straw-colour passing into the dark brown keel which is shortly 

 ciUate up to the base of the strong apiculus ; flowers withered, 

 corolla-segments apparently oblong, staminodes 2armed den.sely 

 pilose, shorter than the stamens, anthers broadly linear ; unripe 

 fruit compressed, broadly oval. 



