898 CONTRIBUTIONS FEOM THE NATIONAL HERBAEIUM. 



Ribs 6 to 12. 



Areoles borne on ribs, when these are crenate borne on elevations. 



Joints green, not glaucous 1. L. hollianus. 



Joints glaucous when young, the bloom persistent as whitish 



streaks 2. L. pruinosus, 



Areoles borne in depressions of the crenate ribs. 

 Plants bright green. 



Ribs 9 to 12; flowers greenish yellow 3. L. chichipe. 



Ribs 7 to 9; flowers rose-colored 4. L. chende. 



Plants glaucous 5. L. stellatus. 



Areoles with dark brown or black felt, glandular. 

 Ribs 6 to 8. 



Scales of the ovary 2 mm. long or less 8. L. queretaroensis. 



Scales of the ovary 4 to 6 mm. long 9. L. montanus. 



Ribs 12 to 17 10. L. thurberi. 



1. Lem^aireocereus hollianus (Weber) Britt. & Rose, Contr. U. S. Nat. Herb. 



12: 425. 1909. 



Cereus hollianus Weber; Coulter, Contr. U. S. Nat. Herb. 3: 411. 1896. 



Cereus bavosus Weber ; Schum. Gesamtb. Kakt. 84. 1897. 



Puebla, the type from Tehuac5,n. 



Stem simple or branching only at base, 4 to 5 meters high ; ribs 8 to 12, 

 acute ; areoles 1 to 3 cm. apart ; spines at first bright red, but soon gray ; 

 radial spines about 12, very unequal, 1 to 3 cm. long, mostly spreading; cen- 

 trals 3 to 5, swollen at base, unequal, the lower much longer than the others, 

 sometimes 10 cm. long, strongly deflexed ; flowers borne at the upper areoles, 

 10 cm. long, white; scales on ovary and flower tube with lanate and bristly 

 axils ; fruit " as large as a goose egg," dark purple to red, covered with clusters 

 of spines and bristles ; seeds black, shining. 



Cereus brachiatus Galeotti (Salm-Dyck, Cact. Hort. Dyck. 1849. ]95. 1850) 

 must be very close to L. hoUianns if not identical. 



2. Lemaireocereus pruinosus (Otto) Britt. & Rose, Cactaceae 2: 88. 1920. 

 Echinocactus pruinosus Otto ; Pfeiff. Enum. Cact. 54. 1837. 



Cereus pruinosus Otto ; Forst. Handb. Cact. 398. 1846. 



Cereus laevigatus Salm-Dyck, Cact. Hort. Dyck. 1849. 204. 1850. 



Oaxaca and elsewhere in south-central Mexico. 



Plant usually tall, with a more or less definite trunk ; ribs 5 or 6, very high, 

 separated by broad intervals ; spines few, the radial ones 5 to 7, brownish ; 

 central spine solitary, 3 cm. long; flowering areoles large, brown-felted; flowers 

 about 9 cm. long; upper scales and outer perianth segments 1 cm. long or 

 less, rounded at apex; inner perianth segments longer and thinner than the 

 outer ones ; ovary with numerous brown-felted areoles ; fruit ovoid, spiny, 6 

 to 7 cm. long. 



3. Lemaireocereus chichipe (Goss.) Britt. & Rose, Cactaceae 2: 89. 1920. 

 Cereus chichipe Goss. Bull. Mus. Hist. Nat. 11: 507. 1905. 



Cei-eus mixtecensis Purpus, Monatsschr. Kakteenk. 19: 52. 1909. 



Puebla and Oaxaca ; type from Cerro Colorado, near TehuacS.n, Puebla. 



Treelike, up to 5 meters high, with a short trunk 80 to 100 cm. in diameter 

 and a large, much branched top ; branches 9 to 12-ribbed, the ribs undulate, 

 acutish, 2 cm. high ; areoles 1 to 1.5 cm. apart ; radial spines or 7, 5 to 10 

 cm. long, grayish ; central spine 1 ; flowers small, yellowish green ; fruit spiny, 

 globose, 2 to 2.5 cm. in diameter, red both within and without; seeds small, 

 black. "Chichipe," " chichibe " ; " chichituna " (fruit). 



The fruit is edible, and is sold in the markets. 



