614 GRAMINEZA. 
23. LEERSIA. 
Leersia, Swartz, Nov. Gen. et Sp. Pl. p. 21; Benth. et Hook. Gen. Plant. iii. p. 1117. 
Five species are known, all of which are indigenous in America ; one of them (L. ory- 
zoides) is also frequent in Temperate Europe and Asia; and ZL. hexandra, Swartz, is 
widely spread in the tropical regions of the Old World. We have only seen two speci- 
mens of this genus from Mexico, and one single culm from Nicaragua, therefore we 
can merely extract from Fournier without making any comparisons. 
1. Leersia gouini, Fourn. Mex. Pl. Enum., Gram. p. 2. 
Leersia mexicana, Rupr. in Bull. Acad. Brux. ix. (reprint, p. 19), non H. B. K. 
Sout Mexico, sand dunes on the coast of Vera Cruz (Galeotti, 5700; Gouin). 
2. Leersia hexandra, Swartz, Prodr. Fl. Ind. Occ. p. 21; Griseb. Fl. Brit. W. 
Ind. p. 5385; Fourn. Mex. Pl. Enum., Gram. p. 2. 
Leersia mexicana, H. B. K. Nov. Gen. et. Sp. i. p. 195; Kunth, Gram. i. p. 179, t. 1. 
Oryza hexandra et O. mexicana, Doll in Mart. Fl. Bras. ii. 2, p. 10. 
Fioripa to TExas.— Mexico, valley of Mexico, between Chalco and Jochimilco, at 
10,500 feet (Humboldt & Bonpland), near Tacubaya (Schaffner), Orizaba (Schaffner ; 
Miller, 2107, 2178), Mirador (iebmann); Nicaxagua, Greytown (Tate, 60).—SoutH 
AMERICA; West Inpies; ArFrica; Asia; AustrauiaA. Hb. Kew. 
3. Leersia ligularis, Trin. in Mém. Acad. Sc. St. Pétersb. 6 série, iii. Botanique, 
p. 168; Steud. Gram. p. 1; Fourn. Mex. Pl. Enum., Gram. p. 2. 
SoutH Mexico, near Jalapa, in woods of Macultepec (Schiede), without locality. 
(Jurgensen, 688). 
4, Leersia monandra, Swartz, Prodr. Fl. Ind. Occ. p- 21; Kunth, Enum. Pl. 
1. p. 6; Griseb. Fl. Brit. W. Ind. p. 535; Rupr. in Bull. Acad. Brux. ix. (reprint, 
p. 20); Fourn. Mex. Pl. Enum., Gram. p. 2. 
Oryza monandra, Doll in Mart. FI. Bras. ii. 2, p. 9. 
Fioripa ; TExas.—SoutH Mexico, Zacuapan, Vera Cruz at 1500 to 3000 feet ( Galeotti, 
5724), Cordova (Schaffner ; Bourgeau), Mirador (Liebmann).—West InpiEs to Braziu. 
5. Leersia ovata, Poir. in Lam. Encycl., Suppl. iii. p. 329; Steud. Gram. p. 2; 
Fourn. Mex. Pl. Enum., Gram. p. 2. 
KasteRN Norra AMeERIcA.—Sovuta Mexico, Potrero de Cazadero (Liebmann), Colipa 
{ Karwinski). 
Fournier retains this as a distinct species; Sprengel (Syst. Veg. i. p. 264) reduces it 
to L. lenticularis, Michx., the most marked species, whilst Munro (MSS. in Steud. 
Gram. in Bibl. Kew) states that he believed it to be a variety of the very different 
LL. virginica. The North-American botanists do not appear to have dealt with it. 
