454 CLVI. CYPERACEE (CLARKE). [ Scirpus. 
The African material divides easily into two groups: 
(a) Stems slender 4, in. thick. Spikelets }—} in. long, very obtuse, greenish- 
‘yellow. Glumes very obtuse, concave, somewhat inflated, scarious, Nut small, 
pallid, with wavy horizontal lines.—This is called Isolepis senegalensis by Hoch- 
stetter, I, prelongata by Nees. 
(2) Stems 3-1 in. thick. Spikelets } in. long and upwards, acute, marked red 
and brown. Glumes at the tip triangular, subacute. Nut large, dark-brown, with- 
out wavy horizontal lines. 
These two forms appear separate in Africa; but the great quantity of Indian 
material has not been divided satisfactorily between the two. All modern authorities, 
from Boeckeler to Schumann, unite the two African forms as one species. 
13. S. quinquefarius, Boeck. in Linnea, xxxvi.701, Spikelets in 
fruit 4 by 1-1 in., the glumes Jaxly spreading ; otherwise as S. articulatus, 
Linn., form a.—C. B. Clarke in Hook. f. Fl. Brit. Ind. vi. 657, m 
Durand & Schinz, Conspect. Fl. Afr. v. 629, and in Dyer, Fl. Cap. vi. 
228. Isolepis lupulina, Nees in Wight, Contrib. 107 ; Kunth, Knum. 
Hm. 298. 
Nile Land. British East Africa: Athi, Gregory, 102! 
Frequent in India, also once collected in the Transvaal. 
The stems are with or without false transverse septa. 
This species might be reduced to S. articulatus ; owing to the yellow-brown 
wuch-inflated spreading glumes, the specific name “ lupulina”’ (like hop-heads) was 
ay plied by Nees. 
14. S. mucronatus, Linn. Sp. Pl. ed. 2, 73 mainly. Glabrous. 
Rots fibrous, or rarely a horizontal rhizome 4—6 in. long. —_ 
tvfied, 4-24 ft. long, stout, triquetrous, bearing 1 apparently lateral 
head ; lowest bract trigonous, appearing as a continuation of the stem, 
4-3} in. long. Leaves0. Spikelets few or numerous, }—} in. long, 
ellipsoid, subacute. Glumes ovate, subacute, nearly entire at the tip. 
Hypogynous bristles usually 5 (or 6), unequal, some nearly as long as 
the nut, brown, retrorse-scabrid (but the bristles are sometimes 54 
and occasionally 0). Style linear ; branches 3. Nut less than 3 the 
length of the glume, obovoid, trigonous, shining black-chestnut, smooth 
or obscurely transversely wavy.—Delile, F). Egypt, 14, +. 1, Be 33 
Kunth, Enum. ii. 161; Boeck. in Linnea, xxxvi, 703; C. B. Clarke Ip 
Hook. f. Fl. Brit, Ind. vi. 657, in Durand & Schinz, Conspect. Fl. Afr. 
v. 628; K. Schum. in Engl. Pf. Ost-Afr. C. 126 partly. 
Upper Guinea. Cameroons: Yaunde, Zenker, 677 ! : 
Also in Europe, Western Asia to Japan, Australia, and Polynesia.—This speci® 
abundant in Europe and India, appears to avoid Africa, as it is not recorded even e 
Algeria by Cosson and Durieu, nor have I ever seen any example from Africa a 
Zenker’s. It is, however, a weed that might appear anywhere in a rice-field, 2» 
may have been carried to the Cameroons, 
15. S. lacustris, Linn. Sp. Pl. ed. 2,72. Glabrous, except the 
glumes. Rhizome horizontal. Stem 2-6 ft. long, stout, cere or 
somewhat trigonous at the top. Leaves usually 0; occasionally eee gr 
long. Umbel simple or compound, rarely contracted into a head 0 
