292 CLVI, CYPERACEZ (CLARKE). [ Pycreus, 
transversely muriculate.—Rendle in Cat. Afr. Pl. Welw. ii. 107, 
Cyperus pauper, A. Rich. Tent. Fl. Abyss. ii. 478 (but erroneously 
placed in Zu-Cyperus); Boeck. in Linnea, xxxv. 451; Ridley in Trans. 
Liun. Soc. ser. 2, Bot. ii. 126; K. Schum. in Engl. Hochgebirgsfl, 
Trop. Afr. 138. C. intermedius, var. tenuis, Boeck. in Linnea, xxXxv, 
451. 
Nile Land, Abyssinia: Sana; in marshes on the mountain plain of Walcha, 
Schimper, 1602! Shireh province, Petit! Begemeder, Schimper, 1311 ! 
Lower Guinea. Angola: Ambaca ; borders of flooded fields between the River 
Caringa and Lake Canguele Canganga, Welwitsch, 7069 ! 
A species of Fimbristylis is mixed with Schimper, 1602, and it is partly from the 
mixture of plants that this species has been so strangely described ; Steudel (Syn. Pl, 
Glum. ii. 5) says that the stems when young are patently hairy, when old, glabrous. 
6. P. nigricans, C. B. Clarke in Durand & Schinz, Conspect. Fl, 
Afr, v. 539. Rhizome seen oblique, woody, short; stolons sometimes 
present (fide Boeckeler). Stems 8-24 in, long, slender ; basal sheaths 
long, brown, stout, apparently thickening the stems. Leaves often 
4 the length of the stem, =,-} in. broad. Head 1, of 3-11 black 
(rarely dark-brown) sessile spikelets; bracts 2-3, lowest 3-4 in. long, 
similar to the leaves. Spikelets attaining } by 1 in. (sometimes only 3 
these dimensions), compressed, narrowed at each end, 10—20-flowered, 
Glumes close-packed, ovate, obtuse, inflated; keel green. Nut 2 the 
length of the glume, oblong or somewhat obovoid, black ; outermost 
cells (on the shoulders of the nut) elliptic—C. B. Clarke in Trans, 
Linn. Soe. ser. 2, Bot. iv. 53. Cyperus nigricans, Steud. in Flora, 1842, 
584, and Syn. Pl. Glum. ii. 12; A. Rich. Tent. Fl. Abyss. il. 476; 
Boeck. in Linnza, xxxv. 462; CO. B. Clarke in Journ. Linn. Soc. xxl 
42; K. Schum. in Engl. Pf. Ost-Afr. C. 117; Engl. Hochgebirgsfl. 
Trop. Afr. 139. 
Mile Land. Abyssinia: Samen; swamps near Enjedcap, Schimper, 1373! 
Begemeder; Gafat, Schimper, 1286! British East Africa; Nandi, by streams, 
7000-8000 ft., Scott-Elliott, 6963! 
_Mozamb. Dist. German East Africa : Kilimanjaro, 10500 ft., Volkens, 2014! 
British Central Africa; Nyasaland; Mount Malosa, 4000-6000 ft., Whyte ! Mount 
Zomba, 4000-6000 ft., Whyte! Mount Mlanji, 6000 ft., Whyte! Shire Highlands, 
Buchanan, 28! and without precise locality, Buchanan, 990! 1454! 
The nut is reticulated rather than muricated ; the species is near P. umbrosus; 
ees. 
7. P. subtrigonus, (. B. Clarke in Durand & Schinz, Conspect. Fl, 
Afr, v. 542, Rhizome descending, seen 14 in. long, 75 i. thick. 
Stems 6-14 in. long. Leaves 2 the length of the stem, 4 in. broad. 
Spike solitary, of 12-30 spikelets; bracts 3, lowest 3 in. long, similar 
to the leaves. Spikelets 4-2 by } in., compressed, yellow-brown, 
20-36-flowered, with parallel sides. Glumes ovate, obtuse, keel 
Nut 4 the length of the glume, obovoid, with a protuberance on ©a¢ 
side so that it is almost trigonous; style-branches 2, linear, in @ gph 
passing through the axis of the spikelet ; outermost cells loosely elliptic, 
