411 
20 mm.), sometimes wanting above; centrals 3 to 6, larger and longer 
(2 to5 em.): flowers greenish-white, 6.5 to 7.5 em. long: fruit globose, 
3.5 to 7.5 em. in diameter, spiny at length naked, olive-color with crim- 
son pulp (‘like a large orange and of delicious taste” ): seeds obliquely 
obovate, keeled on back, shining and minutely tuberculate, 1.8 to 2 mm. 
long. (Jll.Cact. Mex. Bound. t. 74, f. 15)—Type, Thurber 2 and 367 in 
Herb. Mo. Bot. Gard. 
From southwestern Arizona southward throughout Sonora and Lower 
California (especially in the Cape region). 
Specimens examined: ARIZONA (Vasey of 1875; Evans of 1891, at 
Casa Grande): SONORA (Thurber 2 and 367; Schott 2; Palmer ot 1869; 
Pringle of 1884): LOWER CALIFORNIA (Gabb 3 of 1867; Brandegee of 
1889, Purissima and San [Estaban), 
The “ pitahaya dulce” of the natives. 
76. Cereus hollianus Weber, MSS. 
Branching from base, 4 to 5 m. high and stout, dark-green: ribs 10 
to 12, acute, often oblique, with areolw 2 to 3 em. apart: radial spines 
about 12, irregular, 1 to 1.5 em. long; centrals 3, the lower one 5 to 10 . 
cm. long and deflexed: flowers near the summit, white, 10 em. long: 
fruit ‘tas large as a goose egg,” dark purplish-red, bearing wool and 
spines.—Type, Weber specimens in Herb. Mo. Bot. Gard. 
Common about Tehuacan, Puebla. 
Specimens examined: PUEBLA ( Weber of 1864). 
fmportant for its wood, which forms long straight rods used for poles in hedges 
and vineyards. ; 
77. Cereus flexuosus Engelm. MSS, 
Rather large, branched at base and straggling, the branches elongate 
(12 to 24 dm. and 7.5 to 10 cm, in diameter), flexuous (often detlexed), 
and diffusely branched: ribs 6 to 8, with deep intervals and remote 
areole: spines stout and angular, black at length ashy, annulate; 
radials usually 8 to 10 and radiant, 1 to 2 em, long, the lowest slenderer ; 
centrals 1 to 4, much stouter and erect, 2.5 to 4.5 cm. long: flower 
unknown: fruit globose: 2.5 to 5 em. in diameter, dark-red and spinose, 
acid.—Type, Gabb 5 in Herb. Mo. Bot. Gard. 
Rocky or Sandy ground, from Cape San Lucas to near Rosario, Lower 
California. 
Specimens examined: LOWER CALIFORNIA (Gabb 5 of 1867), 
The plant is large, dark-green, and very straggling, the elongated branches arising 
from the base and afterward sending off lateral branchlets, often forming impene- 
trable thickets. The local name is *‘ pitahaya agre.” 
++ ++ Spines on fertile branches long-setaceous or hair-like. 
78. Cereus schottii Engelm. Syn. Cact. 288 (1856). 
‘Erect or ascending, with numerous stems from the same base, often 
forming dense thickets, yellowish-green, 24 to 30 dm. high, with 2 to 
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