290 CLVI, CYPERACEE (CLARKE), [ Pycreus. 
Umbel compound. Margins of glumes con- 
spicuously scarious. 
Spikelets 4 in. wide, glistening . ; . 33. P. albomarginatus. 
Spikelets 5), in. wide, hardly glistening . 34. P. tremulus. 
1. P. flavescens, Reichb. Fl. Germ. Excurs. 72. Annual. Stems 
1-12 in. long. Leaves % as long as the stem, 4-4 in. broad. Spikes 
loosely umbellate (or I); bracts 2—4, overtopping the umbel. Spikes 
of 3-12 clustered spikelets, ebracteolate. Spikelets 3 by 1, in. (in the 
form abyssinica, } by 4 in.), compressed, parallel-sided, straw-coloured 
more or less red-tinged, each perfecting 8-36 nuts. Glumes close- 
placed, ovate, obtuse, boat-shaped, inflated. . Nut hardly 4 the length 
of the glume, transversely white-muriculate by reason of the sub- 
persistent ends of the small longitudinally-oblong superficial cells.— 
C. B. Clarke in Hook.f. Fl. Brit. Ind. vi. 589, in Durand & Schinz, 
Conspect. Fl. Afr. v. 537, and in Dyer, Fl. Cap. vii. 156; Durand 
& Schinz, Etudes Fl. Congo, i. 281; Urban, Symb. Antill.ii.16. Cyperus 
fluvescens, Linn. Sp. Pl. ed. 2, 68, not Linn. Herb. ; Kunth, Enum. ii. 
5; A. Rich. Tent. Fl. Abyss. ii. 474; Boeck. in Linnea, xxxv. 438; 
C. B. Clarke in Journ. Linn. Soc. xx. 279 ; Ridley in Trans, Linn. Soc. 
ser. 2, Bot. ii. 125; Zarb in Cat. Spéc. Bot. Pfund, 39; K. Schum. in 
Engl. Pfl. Ost-Afr.C. 117. P. flavescens, var. abyssinica, CO. B. Clarke 
in Journ. Linn. Soc. xx. 279; Rendle in Cat. Afr. Pl. Welw. ii. 106. 
C. abyssinicus, Hochst. ex A. Rich. Tent. Fl. Abyss. ii. 474; Steud. 
Syn. Pl. Glum. ii. 4; Boeck. in Tinnea, xxxv. 440, and in Flora, 1879, 
545 incl. var. monocephala.; Schweinf. Beitr. FI. Aethiop. 214; Eng]. 
Hochgebirgsfl. Trop. Afr. 137; not of Oliver. 
Upper Guinea. Senegal, Perrottet! Sierra Leone; near Freetown, Wel- 
witsch, 7055 | Niger Territory : Nupe, in rice fields, Barter, 1567 ! 
Wile Zand. Kordofan: Er Rahad, Pfund, 604. Galabat: region of 
Matamma, Schweinfurth, 2011! Abyssinia: Tigre; near Adowa, Schimper, 122! 
Mai Kabi, Schimper, 297! Dehli-Dikeno, Schimper, 253! Shireh; in inundated 
places, Quartin-Dillon! British East Africa : by the River Tigirish, Gregory! 
by the Babr el Ghazal, near the ‘Nuer’ Villages, Schweinfurth, 1173! 1251! Bongo; 
Addai, Schweinfurth, 1433! ° y 
Lower Guinea. Lower Congo: at the mouth of the River Kwa, 1000 ft., 
Hens, C, 117! Angola: Pungo Andongo, 3500 ft., in and near the Prasidium, 
Welwitsch, 6907! 6911! banks of the River Cuanza, near Sansamanda, Welwitsch, 
6922! marshes near Quitage, Welwitsch, 6923! Ambaca; marshes near Lake 
Canguele Canganga, Welwitsch 7087! 7096! Golungo Alto; boggy places near 
Sange, Welwitsch, 7072 ! 71011 near Ponte de Luiz Somoes, Welwitsch, 7088! 
Mozamb. Dist. Zanzibar, Taylor! British Central Africa : Tanganyika 
paler at Fort Hill, 350Q-4000 ft., Whyte ! margins of ponds by the Nsessi River, 
coll: 
. ree in Europe, West Asia, North Africa, and America from Canada to South 
razil. : 
2. P. intermedius, C. B. Clarke. Annual. Stems 4-8 in. long. 
Leaves % as long as the stem, ys—i'p in. broad. Spikes loosely umbellate 
(or 1); bracts 2-3, suberect, lowest up to 4 in. long, similar to the leaves. 
Spikes of 3-8 clustered spikelets, ebracteolate, Spikelets 4-4 by vo 
i., Compressed, narrower at cach end, reddish-brown, each perfecting 
