ROSACEZ. | . . 379 
| Tribe ROSE. 
Restricted to the genus Rosa. 
22. ROSA. 
Rosa, Linn. Gen. Plant. n. 631; Benth. et Hook. Gen. Plant. i. p. 625. 
This genus presents an immense variety of slightly different forms, which some 
botanists regard as species, hundreds of which have been described ; but there are pro- 
bably not more than fifty distinct types. They are generally dispersed in the temperate 
and subalpine regions of the northern hemisphere, reaching their southern limits in 
Mexico, Abyssinia, and the eastern peninsula of India. Several double-flowered varieties 
are more or less naturalized in some parts of Mexico. 
1. Rosa blanda, Ait. Hort. Kew. ed. 1, ii. p. 202. 
Widely spread in North America from CaNnapDa and the extreme Nortu-west south- 
wards to the Mexican boundary, and probably in Norta Mexico. 
2. Rosa montezume, Red. Roses, p. 55, t. 16. 
South Mexico, Zimapan (Coulter, 96), San Angel (Bourgeau, 49), Real del Monte 
(Hartweg), around Toluca (Andriewx, 394), Mineral del Monte (Ehrenberg), in oak-woods 
between the city of Mexico and Moran, near the mine of San Pedro, at 8760 feet (Hum- 
boldt & Bonpland), Real del Monte, 7500 feet (Galeotti, 3108). Hb. Kew. 
Schlechtendal refers this to R. canina, Linn. 
Tribe POMEZ. 
Trees and shrubs. Upwards of 150 species, belonging to nine genera. With the 
exception of the genus Osteomeles, which is represented in the Andes of South America, 
from Colombia to Peru, by about eight or ten species, this tribe is restricted to the 
northern hemisphere, and chiefly to temperate regions. 
23. CRATZGUS. 
Crategus, Linn. Gen. Plant. n. 622; Benth. et Hook. Gen. Plant. i. p. 626. 
About thirty species, dispersed all round the north temperate zone. 
1. Crategus crus-galli, Linn. Sp. Pl. p. 632; DC. Prodr. ii. p. 626. 
CanapDa southwards.—Sovutn Mexico, Santa Fé (Bourgeau, 50). Hb. Kew. 
9. Crategus mexicana, DC. Prodr. ii. p. 629; Calques des Dess. Fl. Mex. 
299. | | 
Nort Mexico, San Luis Potosi, 6000 to 8000 feet (Parry & Palmer, 228) ; Sovtx 
Mexico, Teocote (Graham), Vera Cruz (Linden, 656), Jalapa (Galeotti), Orizaba (Bot- 
teri, 831), without locality (Gregg, Christy). Hb. Kew. 
8e2 
