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62 MISSOURI BOTANICAL GARDEN. 



C. (Cephalocereus) columna-Trajani Karw. 1. c. 198. — Mexico. 

 G ( Cephalocereus) macrocephalus (Web.) A. Berg. 1. c. 197. 



Mexico. 



C. (Cephalocereus) melocactus (Veil.) A. Berg. 1. c. 199. — Brazil. 

 C. (Cephalocereus) senilis DC. 1. c. 201. —Mexico. 



II. LOPHOCEREUS A. Ben?. 



Areoles of the flowering part of the branches differing from the rest, 

 more closely set, with short white wool and long stiff setulose bristles. 

 Flowers small. {£ gnAg seyaral.frojn.onp ^d the same areole; ovary 

 roundish with ,4g Sow A&tftt Scajes] tfbe^unieMtiped, with several 

 deltoid-lanceolate scales; perianth tetfVttf ntrtVery •numerous, exterior 

 lanceolate, acute, in^fccy pfle$ iblOSfif t>btuse, spreading, reddish or 

 yellowish; filaments* Jfl&e»^dJb!elc«v the tauldle of the tube, not very nu- 

 merous, not exceeding the p&t#lp;< style longer than the stamens, with 

 5-6 short stigmata. Berry c{. J &pC in diameter, red, with a few broadly 

 deltoid scales; seeds comparatively large, slightly keeled, with shining 

 black smooth testa. — Plate 8 } f. 4-S. * 



Cereus Schottii Engelm. is the type of this subgenus. 

 When the plant is old and about to flower, the areoles 

 grow closer together and produce a profusion of long setu- 



lose bristles, which give the plant a very curious aspect. 

 This species has been considered to be a Pilocei 

 the bristles are much unlike the hairs of this 

 besides, the flowers are very different, and in P 

 they are always single. 



genus 



My 



locactus, but I think it better to create a proper subgenus, 

 on account of the great difference in the general appear- 

 ance of the plant, the larger reddish flowers with enclosed 

 stamens, and the* scaly fruit. 



According to Mr. Brandegee, however, there occurs a 

 variety of C. /Schottii Engelm. near Tedos Santos, in Baja 

 California, which has not such setulose bristles, but only 

 the small spines of the juvenile state. When better known, 

 this plant will perhaps form a transition from this sub- 

 genus to Myrtillocactus . 



* Nachtr. 64. 



