STANDLEY TKEES AND SHRUBS OF MEXICO. 333 



24. Rubus oligospermus Thornber; Rydb. N. Amer. PI. 22: 470. 1913. 

 Rubus scolocaulon T. S. Brandeg. Univ. Calif. Publ. Bot. 6: 498. 1919. 



Baja California and Sonora to San Luis PotosI and Jalisco. Southern Ari- 

 zino ; type from Santa Catalina Mountains. 



Stems trailing, glabrous, 1 to 6 meters long; leaflets 3 or 5, 5 cm. long or 

 shorter; flowers white. 



This has been reported from Mexico as R. trivialis Michx. 



25. Rubus humistratus Steud. Norn. Bot. ed. 2. 2: 478. 1841. 



Rubus humifusus Schlecht. Linnaea 13: 270. 1839. Not R. humifusus Weihe 



& Nees, 1821. 

 Southern Mexico ; type from Jalapa, Veracruz. 



Stems prostrate, 1 to 2 meters long ; leaflets 3, ovate, 3 to 6 cm. long ; flowers 

 white. 



26. Rubus parviflorus Nutt. Gen. PI. 1 : 308. 1818. 

 Rubacer parviflorum Rydb. Bull. Torrey Club 30: 274. 1903. 



Mountains of Chihuahua. Northward to Alaska and Ontario ; type from 

 Lake Huron. 



Shrub, a meter high or less, unarmed, glandular-pubescent ; leaves petiolate, 

 reniform, 5 to 10 cm. wide, 3 or 5-lobed ; flowers paniculate, the petals white, 

 1.5 to 3 cm. long; fruit thimble-shaped, red, 1.5 to 2 cm. wide, juicy, edible. 



Known in the United States as " thimbleberry." The fruit is often gathered, 

 but is of rather poor quality. It collapses when picked. The flowers are very 

 showy and handsome. 



27. Rubus neomexicanus A. Gray, PI. Wright. 2: 55. 1853. 

 Oreobatus neomexicanus Rydb. Bull. Torrey Club 30: 275. 1903. 



Northern Sonora. Arizona and New Mexico; type from Santa Rita, New 

 Mexico. 



Shrub, 1 to 3 meters high, with flaky bark; leaves cordate-reniform, 3 to 9 

 cm. wide, pubescent, long-petiolate ; flowers white, the petals 2 to 2.5 cm. long ; 

 fruit 1.5 cm. broad, red. 



28. Rubus trilobus Seringe in DC. Prodr. 2: 566. 1825. 

 Rubus mexicanus Kuntze, Meth. Sp. 102. 1879. 

 Oreobatus trilobus Rydb. N. Amer. Fl. 22: 428. 1913. 

 Veracruz, Puebla, Oaxaca, and Chiapas. Guatemala. 



Shrub ; leaves cordate, 3-lobed ; petals white, 2 cm. long ; fruit purple, 1.5 cm. 

 broad. 



DOUBTFUL SPECIES. 



Rubus madbensis Jones, Contr. West. Bot. 12: 14. 1908. Described from 

 Chihuahua. 



12. ROSA L. Sp. PI. 491. 1753. 



Erect shrubs, armed with prickles ; leaves pinnate ; flowers solitary or 

 corymbose, large and showy ; hypanthium enlarged and fleshy in fruit, bearing 

 numerous achenes on the inner surface. 



Many species of roses (" rosas ") of European or Asiatic origin are cultivated 

 in Mexico for their beautiful flowers. The fruits of some of the North 

 American species are sweet and palatable when frosted, and they were eaten 

 by the Indians, especially in winter, when food was scarce. Among the Tewa 

 Indians of New Mexico a salve made from the petals is used for sore mouth, 

 and a decoction of the fruit was employed by the Omaha as a wash for sore 

 eyes. Some of the tribes smoked the inner bark, either alone or mixed with 

 tobacco. 



Leaflets mostly 5 to 10 mm. long; fruit densely spiny 1. R. minutifolia. 



