at Heiidon Vicarage, Middlesex. 



31.9 



Sect. II. MACRACA^NTHiE. — Spines long. 



7 multiplex. 11 in. high, and 7 in. 



diam. — Syn. Cereus multiplex. 



8 m. monstrosus. 2 in. high, and 



2i in. in diameter. 



9 tubiflorus. 8 in. high, and 6 in. in 



diameter. — Syn. Cereus tubi- 

 florus ; Echinonyc. Zuccarinw. 



10 leucanthus. 7 in. high, and 7 in. 



in diameter. — Syn. Cereus leu- 

 canthus ; C. incurvisplnus; Me- 

 locactus ambigua ; M. elegans ; 

 E. campylacanthus. 



1 1 formosus. 6 in. high, and 6| in. 



in diameter. — Syn. E. Gilliesw. 



Genus VI. MELOCA'CTUS. 



Form globular. Surface angled or furrowed. Floiuers produced on a bristly 

 and downy cap at the top of the plant, smaller than those of any other 

 section. Berry tubular and pulpy, concealed in the cap till the seed is 

 matured ; after which it presents itself to view. It is .much like the berry 

 of Mammillaria. 



1 communis, lift, high, and 1 ft. in 



diameter. — Syn. Cactus Melo- 

 cactus; C coronata. 



2 c. conica. \\ ft. high, and 1 ft. in 



diameter. — M. c. 2 oblonga. 



3 c. 3 havannaensis. 5 in. high, and 



6i in. in diameter. 



4 c. 4 viridis. 8 in. high, and lOi in. 



diameter. — Cactus Melocacfus. 



5 c. 5 macrocephala. li ft. high, 



and 1 ft. in diameter. 



6 pyramidahs. 10 in. high, and 9 in. 



in diameter. — Syn. Cactus py- 

 ramidalis. 



7 HookenV. 7 in. high, and 9 in. in 



diameter. 



8 Lemani. 6 in., high, and 6 in. in 



diameter^ 



9 amoe^na. 4 in. high, and 6 in. in 



diameter. — Syn.,M. c. Jordensiz, 

 M. rubens. 



10 meonacantha. 5 in. high, and 



6 in. in diameter. 



11 violacea. 7 in. high, and 9 in. in 



diameter. 



12 depressa. 3 in. high, and 3 in. in 



diameter. 



Genus VII. PILOCE REUS. 

 Syn. Ca'ctus, Ce'reus. 



Form columnar, erect. Surface angled or furrowed, remarkable for long white 

 hairs, besides the spines in the fascicles. 



The singularly beautiful muff cacti in Mr. Lambert's museum have, for 

 some time, been supposed to be the flowering parts of Pilocereus senilis ; 

 and the recent information which has been obtained on the subject leaves 

 no doubt that this is the fact. We are told that this species, which attains 

 a considerable height in its native country (specimens have been sent to 

 England above 15 ft. long), when it attains its full growth, produces at or 

 near the top a great quantity of brown woolly hair, which differs from that 

 below, not only in its colour and quality, but in being extremely dense. 

 The flowers are produced in zones in this dense hair or muff; but whether 

 one or two zones of flowers are produced in each year we have not yet 

 learned. 



The second species, P. columna Trajani, is in the possession of my em- 

 ployer, and it has emitted an extra patch of hair on one side near the top, 

 which has not yet extended round the column ; thus it appears as though 

 the column had burst, and protruded this dense tuft of hair from its inside. 

 Whether this tuft will flower without extending round the column or not, 

 remains to be proved. 



1 senilis. 3 ft. high, and 6 in. in 



diameter. — Syn. Cereus senilis ; 

 C. bradypus. 



2 columna. 2 ft. high, and 4 in. in 



diameter. — Syn. Cereus co- 

 1841.— VI. 3d Ser. 



lumna Trajanf; Melocactus co- 

 lumna Trajani ; Pilocereus co- 

 metus. 



monacanthus. 3| in. high, and 



2i in. in diameter. 



