Cyperus. | CLVI. CYPERACE (CLARKE). 369 
form tenuiflora, Roxb., very slender). Spikelets linear. Glumes in 
fruit obliquely spreading; otherwise as C. rotwndus, Linn.—Kunth, 
Enum. ii. 50 (only in small part); Boeck. in Linnea, xxxvi. 285 
partly; C. B. Clarke in Hook. f. Fl. Brit. Ind. vi. 616, and in 
Durand & Schinz, Conspect. Fl. Afr. v. 580; Durand & Schinz, Etudes 
Fl. Congo, i. 294. 
Upper Guinea. Senegal, Adanson, 164A! 
Lower Guinea. Lower Congo: in the Manioc fields at Stanley Pool, 950 ft., 
Hens, B, 21! 
South Central. Congo Free State, Demeuse / 
Also in the Mascarene Islands, India, Formosa and Australia. In the large 
forms of C. rotundus the plant ‘is usually rigid, the primary rays of the umbel 
stout, 
108. C. ibeensis, XK. Schum. in Engl. Pf. Ost-Afr. C. 120. 
Glabrous. Stems 7, densely tufted, 2 ft. high, very slender, thickened 
at the base by long dusky withered leaf-sheaths; a thick mass of roots, 
but no stolon present. Leaves 2 the length of the stem, 5}, in. broad. 
Umbel simple ; rays 3-5, up to 1-14 in. long; bracts 3-4, similar to 
the leaves, lowest up.to 8in. long. Spikes of 5-17 spikelets. Spikelets 
3 by 1, in., compressed, a fine red, 20-40-flowered ; rhachilla quad- 
rangular, wings narrow oblong. Glumes densely packed, ovate, obtuse, 
S-nerved, 1-coloured, i.e. red, hardly greenish on the keel, regularly 
deciduous from the lowest upwards. Stamens 3; anthers linear-oblong, 
muticous. Style rather shorter'than the nut; branches 3, long. Nut 
} the length of the glume, obovoid, trigonous, smooth, brown. 
Wile Land. British East Africa: Uganda, Wilson, 751! Ukamba; Kitui, 
Hildebrandt, 2657 ! Shimba Mountains, near Mombasa, Taylor / 
This species is very unlike any other, nor can I guess its true affinity. I 
formerly arranged it with the Section Tunicate ; but, if it should prove to have 
evanescent stolons producing bulbils, the spikelets will be different from those in 
any of the Tunicate. 
109. C. radiatus, Vahl, Hnwm. ii. 369. Glabrous. Rhizome 0; 
lateral shoots are sometimes formed at the base of the stem, flowering the 
Second year. Stem, when fairly developed, 1-2 ft. long, but small 
examples 6—8 in. are frequent, examples only 1 in. long have occurred. 
Leaves 2 the length of the stem, up to 2 in. broad. Umbel in well- 
‘developed examples 6-10 in, in diam., but in African examples often 
contracted, sometimes into one dense head ; bracts similar to the leaves, 
much overtopping the inflorescence. Spikes digitate, their pedicels 
hardly exceeding } in. in length, dense, cylindric, with suberect or 
Spreading spikelets, 1 by 4-% in. Spikelets 3-3 by 3/5 in., 10-36- 
Owered, strongly compressed, pallid or finally brownish, not or rarely 
highly coloured red or yellow; wings of the rhachilla oblong, per- 
Sistent, hyaline. Glumes ovate, usually apiculate, very closely placed 
on the rhachilla and (even in fruit) tightly imbricate. Stamens 3; 
anthers small, muticous. Nut 2-} the length of the glume, ovoid or 
Wide-ellipsoid, acutely trigonous, pyramidal at the base and = finally 
VOL. VIII, 2 
