PLANTS FROM BAJA CALIFORNIA. 161 



Mamillakia, sp. Karely proliferous, globular, 4-6 inches 

 in diameter. Flowers pinkish-white, blooming in May. — 

 San Jorge to El Campo Aleman. 



Mamillaria, sp. Growing in densely ca3spitose, flattened 

 masses, 2-4 feet in diameter. — San Julio Canon, San Pablo. 



Mamillaria Halei. (Plate VI.) C?espitose, stems 8-10, 

 about a foot high, 2-3 inches in diameter, straight, covered 

 Avith dark -colored straight spines: tubercles short, rounded, 

 woolly in the axils: spines 15-25, one-half inch long, with 

 3-4 of theinterior ones stouter and an inch long: flowers an 

 inch long, vertical from the axils of young tubercles, scarlet: 

 sepals all scarlet, petaloid: anthers scarlet, filaments ex- 

 serted yellowish, stigma scarlet: fruit red, clavate, one-half 

 inch long: seeds smooth. — A handsome species, seen only 

 upon Magdalena and Santa Margarita Islands, where it is 

 very abundant. 



EcHiNOCACTUS WiSLiZENi Engelm . "Biznaga." This spe- 

 cies is common and variable in Lower California. It some- 

 times becomes eight feet high. The^ lateral spines of the 

 specimens collected vary in number from 7 to 12, the flow- 

 ers are greenish yellow, with a narrow or broad reddish 

 central line upon each petal, or sometimes entirely dull red. 

 The spines are from two to six inches long, and in some 

 localities are all perfectly straight. The fruit is hard and 

 yellow when ripe, acid to the taste, and though not unpleas- 

 ant, is not eaten by the sugar-loving inhabitants. It blooms 

 in May, while at the same time fruit of different ages may 

 be found on other plants. — San Gregorio and northward. 



Cereus (Echinocereus), sp. Flowers purple. The plants 

 somewhat resemble C. gonacanihus. — San Gregorio to El 

 Campo Aleman. 



Cereus phceniceus var. Pacificus Engelm. West Am. 

 Scientist ii, 46. Probably this species, but without flowers 



2d Ser., Vol. U. ( 12 ) November 25, 1889. 



