GRAMINEA, . 513. 
20. ZEA. 
Zea, Linn. Gen. Plant. n. 1042; Benth. et Hook. Gen. Plant. iii. p. 1114. 
A monotypic genus. 
1. Zea mays, Linn. Sp. Pl.ed.1, p. 971; Fourn. Mex. Pl. Enum.,.Gram. p. 70. 
Maize or Indian corn is cultivated in Mexico and Central America. It is almost 
certainly of American origin, though the wild condition is unknown. 
Tribe IIT. ORYZEA. 
Oryzee, Benth. et Hook. Gen. Plant. iii. pp. 1075 et 1079. 
This small tribe, which is sparsely represented in Europe, Asia, Africa, America, and 
Australia, consists of aquatic or subaquatic grasses. Nine genera are admitted by 
Bentham and Hooker and about thirty species. 
21. LUZIOLA. 
Luziola, Juss. Gen. Plant. p. 33; Benth. et Hook. Gen. Plant. iii. p. 1115. 
An exclusively American genus of about six species, ranging from the southern United 
States to Brazil. 
1. Luziola peruviana, Pers. Syn. Pl. ii. p. 575; Kunth, Enum. Pl. i. Suppl. 
p.9; Déll in Mart. Fl. Bras. ii. 2, p.17, t.5; Fourn. Mex. PI. Enum., Gram. p. 1; 
Griseb. Fl. Brit. W. Ind. p. 535. | 
Luziola mexicana, H. B. K. Nov. Gen. et Sp. i. p. 199. 
' SovutH Mexico, between Tula and Queretaro, at 6000 feet (Humboldt & Bonpland),. 
Orizaba (Schaffner).—Prrv, Gutana, Brazii, and TRINIDAD. 
We have seen no Mexican specimens; but in the ‘ Genera Plantarum’ a distinction 
is drawn between L. peruviana proper, L. peruviana, Mey. Prim. Fl. Esseq. t. 2, and some: 
others ; the former having, it is stated, both the male and the female flowers in terminal 
panicles, whilst the females in the latter are lateral. This distinction may possibly hold 
good with regard to L. alabamensis and an undescribed specimen from Guiana; but, as. 
Doll observes, in L. peruviana it is only when the culms are wholly female that the ter- 
minal panicle is female—“ Panicule feminee in culmis moneccis axillares, ambitu sub- 
ovate, plerumque duz vel tres, in culmis mere femineis terminales tumque plerumque. 
majores, ambitu oblong atque elongate.” 
22. ORYZA. 
Oryza, Linn. Gen. Plant. n. 1042; Benth. et Hook. Gen. Plant. iii. p. 1116. 
An Asiatic genus of about five distinct species, according to Bentham, though nearly 
twenty have been described. 0. sativa is now cultivated in all warm countries, and is. 
also more or less established in a wild state. 
BIOL. CENTR.-AMER., Bot. Vol. III., November 1885. 3 u 
