Cactacee of Baja California. 19 
MAMILLARIA GoopripGi Scheer. is abundant at the southern 
extremity of the peninsula about San José del Cabo. The scarlet 
fruit, though small, has a pleasant acid taste. 
MAMILLARIA ROSEANA. Stems numerous from the root, 
spreading, curved, ascending, %-2 m. long, 4 cm. thick; mamil- 
le arranged in quincunxial order, 15 mm. apart, cylindrical, 12 
mm. long, white-woolly in the upper axils; pulvinze finely pubes- 
cent; radial spines 7-9 in number, 9-12 mm. long, brown or straw 
colored, the single central spine, 25 mm. long, curved, hooked at 
the tip; flowers from the axils of the upper mamilla, 3 cm. long; 
sepals and petals bright scarlet, joined into a tube, spreading at 
their tips, in several series; stamens and style scarlet; style branches 
5-7; fruit scarlet, pyriform 6-8 mm. long; seeds black, pitted; 
cotyledons united, only a depressed line at their tips; albumen 
none.—Throughout the lower elevations of the Cape Region and 
_ northward to Calmalli. 
This cactus is one of the most showy of Lower California. Dr. 
Palmer collected it at La Paz and it is No. 139 of the list from that 
place in Contr. U. S. Herb. No. 3, catalogued by Mr. Rose for whom 
it is appropriately named. The stems pendent from rocks at Com- 
ondu are sometimes six feet long. This species and JZ. Halez of 
Magdalena and Santa Margarita Islands have similar flowers, fruit 
and seeds. The seeds of JZ Halei were wrongly described as 
smooth; they are pitted in the same manner as those of this species. 
CEREUS PECTEN-ABORIGINUM ENGELM. This giant cereus is 
common at San José del Cabo, La Paz, Todos Santos. 
CEREUS PRINGLE! Watson is also abundant. 
CEREUS STRIATUS. Stems 4-angled, becoming terete, 1 m. high, 
2-6 mm. in diameter, very sparingly branched above, ash-colored, 
weak, 9-ribbed or striate, the ribs flat and slightly raised above the 
flat, greener depressions, areolze small, about 6 mm. distant verti- 
cally, slightly lanate when young; spines about 9, soft, closely 
appressed, either light-colored or brown, 2 mm. long; flowers few, 
10-12 cm. long, tube elongated, bearing bristles 8-g mm. long, 
similar to the spines of the stem; fruit sessile, obpyriform, 2-214 
em. in diameter, 3-4 cm. long, bright scarlet when mature and 
: bearing the persistent spines; seeds angular black, finely pitted, 
embryo slightly hamate.—San José del Cabo in fruit and with 
remnants of dried flowers. Found also on Magdalena and Santa 
_ Margarita Islands and northward beyond San Ignacio, 
