409 
Northwestern Sonora and Lower California (especially abundant in 
the Cape region) and adjacent islands, 
Specimens examined: SONORA (Pringle of 1884): LOWER CALIFOR- 
NIA (Palmer 418, on San Pedro Island; Brandegee of 1889, San Grego- 
rio, San Luis, Santa Margarita Island), 
Stouter, but not so high as giganteus, with numerous branches starting within 6 to 
dm. of the ground. The flowers are not clustered at summit, but are scattered 
along the ribs for 6 to 9 dm. below the top, The average height is about 7.5 
m., with a circumference of 18 to 21 dm. below the branches. This species and C. 
pecten-aboriginum form the great “cardon” forests of Lower California. Brandegee 
describes one of these forests, made up chiefly of C. pringlei, that ‘‘eovered the 
ground almost entirely for miles, so that when looking down upon it not even a bush 
is visible.” The dead wood is much used for fuel and other purposes, and the seedy 
fruit is an article of food, 
70. Cereus tetazo Weber, MSS. 
Stout, branching, 10 to 15 m. high: flowers greenish-white, 6 em. 
long, in clusters of 10 to 20 from the youngest areole and without any 
wool: fruit irregularly dehiscent, exposing the ripe pulp.—Type, Weber 
specimens in Herb. Mo. Bot. Gard. 
At Zapatalan, Jalisco. 
Specimens examined: JALISCO ( Weber of 1864 and 1869), 
Dr. Weber’s manuscript notes are among those of Dr. Engelmann, but neither they 
nor the material are sufiicient for any fuller diagnosis than that given above. Both 
Weber and Engelmann indicated their belief that this was a new species. Weber 
further remarks that the flowers are eaten as a salad, and the fruit is cried in large 
quantities. The specific name probably represents the local name. The species is 
closely related to if not identical with C. pectén-aboriginum. 
71. Cereus calvus Engelm. MSS. 
Erect and spreading, simple or more or less branched, the branches 
ascending or erect: ribs 20 or more (younger ones obtuse and almost 
naked), with areolie acute at both ends, densely woolly, about 10 mm. 
apart and connected by a broad woolly groove: spines all ereet, short 
(2 to 12 mm.) and sharp, irregularly arranged and numerous; radials 
12 to 15, especially the upper ones weak; centrals 5 to 6, somewhat 
stouter and longer; all at length deciduous: flowers short, lateral near 
the apex: fruit globose, 2.5 em. in diameter, loosely covered with light 
yellowish-red spines.—Type, Gabb 2 in Herb. Mo. Bot. Gard. 
Sandy soil, from Cape San Lucas, Lower California, northward. 
Specimens examined: LOWER CALIFORNIA (Gabb 2 of 1867). 
The spines are very soon deciduous, never persisting longer than the second year, 
whence the popular name “cardon pelon” or ‘‘bald cereus.” It may be a form of 
pringlei, and at any rate, with the next species, it forms a part of the “cardon” flora 
so characteristic of the Cape region of Lower California. 
72. Cereus titan Engelm. MSS. 
Erect, simple or more or less branched, branches ascending or erect, 
6 to 15 m. high, and sometimes 6 din. in diameter: ribs 20 or more, the 
younger acute, with approximate areole connected by a woolly groove: 
spines Sharp and rigid, bulbous at base; radials about 12 and radiant; 
