546 CACTACEAE 



Refs. — Cereus giganteus Engelm.; Emory, Mil. Reconn. 159, ill. opp. p. 72 (1848), type 

 loc. along the Gila River; Bot. Mex. Bound, frontisp. (1859) ; Bot. Wheeler, frontisp. (1878) ; 

 Parish in Jepson, Man. 658 (1925). Pilocereus giganteus Riimpl. ; Forst. Handb. Cact. ed. 2, 

 662 (1885) . Carnegiea gigantea Britt. & Rose, Jour. N. Y. Bot. Gard. 9 : 188 (1908) . 



3. C. engelmannii Parry. Saints Cactus. Stems few, oblong, erect, 6 to 12 

 inches high; ribs 11 to 13; spines in clusters of 10 to 12, straight, or somewhat 

 decurved, white or yellow, becoming brown in age, divergent, the central 3 or 4 

 .subulate, 1 to l^A inches long, radials 8 to 15, unequal, short, acicular; flowers 

 purple, 2 to 3 inches long; fruit orbicular to obovate, covered with clusters of 

 acicular spines from felted or pubescent areoles, I/2 to % inch long; seeds punc- 

 ticulous. 



Stony or gravelly hills or dry washes, 1200 to 4000 feet : Inyo Co.; eastern Mo- 

 have Desert; Colorado Desert. East to Utah and Arizona, south to Sonora and 

 northern Lower California. Frequent, but scattered. Individuals exhibit con- 

 siderable variation in the color, length and curvature of the spines. Apr.-May. 



Locs. — Ilanaupah Canon, Panamint Range, Jepson 7100; Ivanpah Mts., Parish; Providence 

 Mts., Mum 4297 ; Ord Mt., Jepson 5927 ; Chocolate Mts., Mum 4- Keck 5013 ; Pinon Wells, Mum 

 4486 ; Whitewater, Hall 452 ; Wagon Wash, near Sentenac Canon, e. San Diego Co., Jepson 

 12,537; Jacumba, McGregor 1011. 



Rcfs. — Cereus engelmannii Parry; Engelm. Am. Jour. Sci. ser, 2, 14:338 (1852), type loc. 

 "mountains about San Felipe, on the eastern declivities of the Cordilleras", e. San Diego Co., 

 Parry; Parish in Jepson, Man. 658 (1925). Echinocereus engelmannii Riimpl.; Forst. Handb. 

 Cact. ed. 2, 805 (1885). 



4. C. mohavensis Engelm. & Bigel. Cliff Cactus. Stems numerous, 4 to 8 

 inches long, densely compacted in rounded clumps; ribs 10 to 12, tuberculately 

 irregular; spines 3 to 8, whitish or gray, straight or curved, the centrals 1 to 3, 

 subulate, 1 to l^/o inches long, the others similar but shorter, radiate and inter- 

 locking ; flowers scarlet, 2 to 2% inches long ; ovary and fruit covered with short 

 slender spines. 



Crevices of cliffs in desert ranges or on valley floors or mesas, 4000 to 5000 feet : 

 mountains on north side of Colorado Desert; Mohave Desert; Inyo Co. East to 

 adjacent Nevada and Arizona. The clumps consist of about 20 to 150 stems but 

 as many as 600 have been counted, all from a single root. May. 



Locs. — Piiion Wells, n. of Indio, Mum 4484; Cushenbury Canon, Parish 1243; Ord Mt., 

 Jepson 5873; Providence Mts., T. Brandegee; New York Mts., Jepson 5444; Ivanpah Mts., 

 Parish; Hanaupah Canon, Panamint Range, Jepson 7087 ; Silver Canon, White Mts., Jepson 7413, 



Refs. — Cereus hohavensis Engelm. & Bigel. Proc. Am. Acad. 3:281 (1856), type loc. on 

 the Mohave River, Bigelow; Parish in Jepson, Man. 658 (1925). Echinocereus mohavensis 

 Riimpl.; Forst. Handb. Cact. ed. 2, 803 (1885). 



5. C. munzii Parish. Stems oblong, stout, erect, in compact clumps of 8 to 

 20; ribs rather low; central spines 2 to 4, subulate, unequal, 1 to 2 inches long, 

 stouter than the 10 to 12 inch-long radials, all ashy-gray or whitish ; flowers cerise, 

 tubular-campanulate, the spiny tube short and the spreading limb 2 to 21/2 inches 

 broad, scales of the ovary subulate, early deciduous; fruit rose-red, obovoid, 1 inch 

 high, crowned by the withered corolla, covered with clusters of about 10 unequal 

 acicular spines i/g to Y2 inch long, which are readily deciduous, filled with a white 

 pulp, edible, but insipid, in which the numerous minute black seeds are imbedded. 



Dry rocky hillsides, 4500 to 7000 feet : San Bernardino and San Jacinto moun- 

 tains. Apparently infrequent. Both this and the two preceding species are 

 diurnal. 



Locs. — Big Bear Valley (e. end), San Bernardino Mts., Mum 5759; Kenworthy, Thomas 

 Valley, San Jacinto Mts. 



Ref.— Cereus munzii Parish, Bull. S. Cal. Acad. 25:48 (1926), type loc. Kenworthy (2 

 miles below), Thomas Valley, San Jacinto Mts., Mum 4- Johnston 5570. 



