333 CLVI. CYPERACEE (CLARKE). | Cyperus. 
Schinz, Conspect. Fl. Afr. v. 547; K. Schum. in Engl. Pfl. Ost-Afr. 
1s. 
Mozamb. Dist. (German East Africa : Usambara (ex Schumann). 
Mascarene Islands, 
This plant has been much cultivated for more than a century, It is so exceed- 
ingly near C. flabelliformis that I have doubted whether it may not be a cultivated 
state; the only wild plants which I sort with C. alternifolius are trom the Mascarene 
Islands. The Usambara example cited by K. Schumann may be exactly my 
Mascarene C. alternifolius, or may be one of the forms which I sort with C. flabelli- 
formis, The leaves described by Kunth and others are an error. 
43. C. sexangularis, Nees in Linnea, ix. 284, and x. 135. Stem 
at the top trigonous or triquetrous, each plane face with 3-1 striz, of 
which the central one is strongest, so that in the typical form the stem 
is subequally hexagonal at the top; otherwise as C. flabelliformis.— 
Kunth, Enum. ii. 32; Boeck. in Linnea, xxxv. 568; C. B. Clarke in 
Durand & Schinz, Conspect. Fl. Afr. v. 577, in Bull. Herb. Boiss. 1v. 
Append. iii. 31, and in Dyer, FI. Cap. vii. 175. 
Mozamb. Dist. British Central Africa: Boruma, on the Zambesi, Meny- 
harth, 1055! 
Frequent in South Africa. 
The typical subequally hexagonal-stemmed plant seems distinct enough from the 
exactly cylindric-stemmed (finely striated) C. flabelliformis. But Bolus has 
supplied intermediate states, till I find it hard to distinguish the species. So far as 
my experience goes, this is the result throughout the Order Cyperacee where the 
discrimination of two species hangs on the roundness or 3-4-angularity of the stem 
alone. 
44. C, denudatus, Linn. f. Suppl.102. Glabrous. Rhizome hort 
zontal, thick. Stems 12—32 in. long, at the top triquetrous or trigonous, 
sometimes triquetrous their whole length and almost 3-winged. Leaves 
hardly any ; the highest sometimes }—1} in. long, green, bayonet-shaped, 
but usually a mere prolongation of the sheath. Umbel, bracts, spikelets 
and nuts as of C. spherospermus, Schrad.—Kunth, Enum. ii. 36 ; 
Boeck. in Linnea, xxxv. 576 partly; C. B. Clarke in Durand & Schinz, 
Conspect. Fl. Afr. v. 555, in Bull. Herb. Boiss. iv. Append. iii. 29, and 
in Dyer, Fl. Cap. vii. 173; K. Schum. in Engl. Pfl. Ost-Afr. C. 119; 
Rendle in Cat. Afr. Pl. Welw. ii. 115. 
Nile Land. British East Africa: Mombasa, Hildebrandt, 2045! Ndoro, on 
Mount Kenia, Gregory, 78! 
Lower Guinea. Angola: Huilla; ponds near Nene, Welwitsch, 6861! 
Mozamb. Dist. Zanzibar, Taylor ! German East Africa : Karagwe ; Bukoba, 
Stuhlmann, 1001! Unyamwezi; Gonda (Igonda), Boehm, 64! Niansa, Stuhlmann, 
872! British Central Africa : on an island at Victoria Falls, Kirk ! 
Also in South Africa and Madagascar. ot 
Var, delicatulus, C, B. Clarke in Durand & Schinz, Conspect. Fl. Afr. v._ 556. 
Rhizome stout. Stems 2 ft. long, stout, triquetrous, almost 3-winged. Umbel 
dense. Spikelets numerous, about ;4; in. broad, Glumes obtuse, chestnut-red.— 
C. denudatus, T. Thoms, in Speke, Nile, Append. 654; Oliver in Trans. Linn, Soc- 
xxix. 165. 
