82 CLARKE. 
2. Cyperus leucocephalus Retz. Ob;;. 5 (1789) 11. 
Stem with one dense globose head, 8 to 14 mm. in diameter. 
Hook. f. Fl. Brit. Ind. 6: G02; Vidal, Rev. PI. Vase. Filip. 283;, Phaner. 
Cuming Philip. 155. Cyperus Borostachys Boeck. in Linna^a 35 (1867-68) 588. 
Sorostachys Kyllingioides Steud. Cyp. 71; Miq. Fl. Xoderl. Ind. 3: 296. 
Philippines, (1417 Cuming). 
Old World, in warm countries, from Senegal to Coehin-China and north 
Australia; also in Brazil, but less frequent. 
3. Cyperus uncinatus Poiret in Lam. Encycl. 7 (1800) 247. 
Annual, 5 to 15 cm. high; heads nmbelled; ghimes with a hooked 
mucro. " • 
IluiiJdl. in Joum. Linn. Soe. 36 (1903) 219. Cyperiis ctispidaius H. B. K. 
Nov. Gen. et Spec. 1 (1815) 204; Vidal, Rev. PI. Vase. Filip. 282; Phaner. 
Cuming Philip. 155. 0. solutus Steud. Cyp. 14; Miq. Fl. Nederl. Ind. 3: 263. . 
Philippines, (676 Cuming), Luzon, (713 Loher). Mindanao, Lake Lanao, 
( Clemens ) . 
In the warmer parts of both hemispheres; a common species. 
4. Cyperus difformis Linn. Amoen. Acad, 4 (1759) 302. 
Annual, 30 to 65 cm. high; spikelets very small, closely agglomerated, 
umbel compound (or simple). 
Miq. Fl. Nederl. Ind. 3: 309; Hook f. Fl. Brit. Ind. 6: 599; Vidul Rev. PI. 
Vase. Filip. 283; Phaner. Cuming. Philip. 155; Hemsl. in Journ. Linn. Soc. 36 
(1903) 210. Cyperus suhrotundus Llanos Fragm. PI. Filip. 14, fide Naves et 
Villar. 
Luzon, (549 Owmint?) ; (726 Lo7ter) ; (3G50 MerWZ/) ; (5680, 6298 i/imcr). 
Warmer Europe, Africa, warmer Asia, Australia, Polynesia; an abundant 
species. From America I have but two examples, one from New Mexico and one 
from Michoacan (Mexico). 
5. Cyperus Haspan Linn. Sp. PI. ed. I, 45, ed. 2, 66 partim. 
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Root in the second year creeping ; plant 3 to 6 dm. high, scantily leaved ; 
umbel usually compound. 
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Hook. f. Fl. Brit. Ind. 6: 600; Miq. Fl. Nederl. Ind. 3: 267; Hemsl. in Journ. 
Linn. Soc. 36 (1903) 213. 
Luzon, (724, 725 Loher)-, (54 Merrill); (5845 Elmer)-, Mindanao, (1999 
Wichura)-, {Clemens); {5S2 CopeJand) . 
Tropical and suhtropical countries throughout the World; an abundant species. 
The type specimen in lib. Linn, propr., marked by him C. Haspan, is not this 
species, while among the pieces of C. Easpan sciUtcrcd through his Herbarium, 
Linnceu^ has named no one '%\ Haspan." 
6. Cyperus flavidus Retz. Obs. 15 (1789) 13. 
An erect, short-lived annual, becoming, in three months, yellow or 
blackish. 
Hook, f, Fl. Brit. Ind. 6: 600. 
Philippines, {Llanos). Luzon, (718 Loher); (3657 Merrill). 
Tropical and subtropical Asia and Africa; abundant. Also in North Australia. 
This is the common small Cyperus of dibbled rice. It rapidly withers as the 
rice field dries. It is difficult to draw a line between it and Cyperus Haspan. 
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