LEMAIREOCERCUS. 



85 



mixed 



make 



back a flower and cluster of spines, which are now preserved in the United States National 

 Herbarium in Washington. From 1 862 to 1914 there is no record that this species has been 

 seen by botanists. Dr. Rose, while exploring in Chile, after several efforts was finally 

 successful in obtaining Uving, herbarium, and formalin material (No. 

 fairly good photograph. 



19393). and also a 



pe 



LEMAIREOCEREUS Britten and Rose, Contr. U. S. 



Stenocereus Riccobono, Boll. R. Ort. Bot. Palmcro 8: 253. 1909. 



12: 424. 1909. 



f 



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r 



s 



Plants usually large, tall, and branching, but rarely low, nearly prostrate, snni)Ie, forming 

 thickets; areoles rather large, felted; spines usually stout and numerous; flowers diurnal or in some 

 species nocturnal, one at an areole, tubular-funnelform or campanulate, the short iwhv tardily 

 separating with the style from top of the ovary; stamens numerous, borne in many rows all along 

 the inner surface of the throat; ovary more or less tubercled, bearing scales felted in the axils, the 

 areoles at first spineless or nearly so, soon developing a cluster of spines; fruit globular to oval, often 

 edible, irregularly bursting when old, exposing the seeds, at first very spiny, but when ripe the 

 spines are often deciduous; seeds many, black. 



The genus commemorates Charles Lemaire (1801-1871), a distinguished French 

 cactologist and horticulturist; it consists of about 21 species, distributed from southern 

 Arizona and Cuba to Peru and Venezuela. 



Type species: Cereus holUanus Weber. 



Key to Species. 



A. Ribs 6 to 20, separated by deep intervals. 



B. Areoles with white, brown, or gray felt, not glandular. 



Spines slender, acicular to subulate. 



Spines not appressed to the joints, a central one usually evident. 



Ribs 6 to 12. 



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



Joints green, not glaucous. 



Flowers lo cm. long; central spine long, reflexcd i. L. hoUianus 



Flowers 7 to 9 cm. long; central spine spreading or 



ascending 2. L. hysln'x 



Young growth glaucous, the bloom persistent as curved, 



whitish streaks. 

 Spines subulate; plants relatively light green. 



Ribs 8 to 10; young growth slightly glaucous 3. L, griseus 



Ribs 6 or 7; young growth definitely glaucous. 



Spines terete, 5 cm. long or less 4. L. pruinosus 



Spines flattened above, up to 8 cm. long 5. L. longispinus 



Spines acicular; plants dark green 6. L. eichlamii 



Areoles borne in depressions of the crenate ribs. 

 Plants bright green. 



Flowers greenish yellow to rose. 



Ribs 9 to 12; flowers greenish yellow 7. L. chichi pe 



Ribs 7 to 9; flowers rose-colored 8. L, cliende 



Flowers white 9 I-^ godingianus 



Plants glaucous, the Lloom persistent as whitish streaks. 



Ribs 6 to 8, bluntly acute 10. 1. aragonii 



Ribs 8 to 12, rounded 1 1. L. stcllatus 



Ribs about 20 '2. L. ireleasci 



Spines usually all radial, appressed to the joints \2». U (kfinens 



Spines very stout, at first reddish l^rown or nearly black 14- i- "UToeri 



BB. Areoles with dark brown or black felt, glandular. 



Ribs 6 to 8. r , . 



vScales of the ovary 2 mm. long or less i.S. /- qucrclarocnsis 



Scales of the ovary 4 to 6 nun. long '<">■ f • ntonUinus 



Ribs 12 to 17 ' '7- ^' ^^'''^''' 



^ A. Ribs 3 to 7, separated by broad and shallow intervals. 



% 



Areoles large, widely separated. 



Stems very stout, erect. o t 1 i 



Stems bluish gray; spines of fruit brown i». l.. taetus 



Stems green; spines of fruit yellow W- Z-. cartujjghtianus 



Stems slender, weak, usually 3 or 4-ribbeu 20. /.. humihs 



Areoles small, nearly contiguous ^'^ L, dunwrhcn 



