at Hendon Vicarage, Middlesex. 



317 



20 m. var. cristata. 2 in. high, 5 in. 



long, and 2i in. in diameter. 



21 submammulosa. 2 in. high, and 



4 in. in diameter. 



Subsect. 2. OttoNl'DEJE. — Tuber- 

 cles more obtuse. 



22 Oitbnis. 6 in. high, and 5 in. 



in diameter. — Syn. Cereus 

 Ottonis. 



23 O. 2 tortuosa. 4 in. high, and 



Sin. in diameter. — Syn. E. 

 muricata. 



24 O. 3 tenuispina. 2i in. high, and 



3i in. in diameter. 



25 concinna. l^in. high, and 2i in. 



in diameter. 



26 luinkii. 3 in. high, and 3i in. 



in diameter. — Syn. Cereus 

 Link». 



Sect. IV. Erina'ce^. — Angles acute. Spines short. The upper fascicles 

 horizontal, and the loivcr ones inverted. 



27 corynodes. 4 in. high, and 6 in. 

 in diameter. — Syn. E. acutan- 

 gula; E. rosacea var. Sellow- 

 idna. 



28 acuata. 3 in, 



in diameter 

 rant«'. 



29 a, var. spinior. 



high, and 4i in. 

 — Syn. E. Cou- 



4 in. in diameter. 



2| in. high, and 



30 erinaceus. 5 in. high, and Tin. 



in diameter. 



31 Sellow/a7i«. 4 in. high, and 6 in. 



in diameter. 



32 sessiliflora. 3 in. high, and Gin. 



in diameter. 



33 s. var. tetracantha. 3 in. high, 



and 5 in. in diameter. — Syn. 

 E. tetracantha. 



Sect. V. Angles few, and mostly robust. 



Subsect. I. Angles obtuse. Fas- Subsect 

 cicles level. 



34 horizonthalonia. 5i in. high, and 



6 in. in diameter. — Syn. E. 

 . equitans. 



35 rhodacantha. — Syn. E. coccinea, 



Melocactus rhodacantha. 



2. Angles more acute. 

 Fascicles teated. 



36 ingens. 6 in. high, and 5 in. in 

 diameter. — Syn. Melocactus 

 ingens. 



Genus IV. ECHINOFOSSULOCA'CTUS. 



Surface angled or furrowed. Flowers and fridt like those of Echinocactus. 

 Fascicles of spines downy : down extended above the fascicles in a straight 

 or cruciform channel ; sometimes confluent, or else in a circular patch, from 

 which the flowers are produced invariably in the umbilicus. 



Sect. I. Gladiato^res. — Angles numerous, dense, narroiv, deep, and acute. 

 Generally one or more of the sjjines in each fascicle fiat, or sword-like, and 

 erect. 



Subsect. 1. Angles large. 



1 coptonigona. 3 in. high, and Sin. 



in diameter. 



2 c. var. major. 3^ in. high, and 



5i in. in diameter. 



Subsect, 2. Angles dense, anfrac- 

 ticous. 



3 ensiformis. 2 in. high, and 3 in. 



in diameter. 



4 gladiata. 4 in. high, and 4 in. in 



diameter. 



5 crispata. 3 in. high, and 4 in. in 



diameter. 



6 obvallata. Sin. high, and 4 in. 



in diameter. 



7 anfractuosa. Sin. high, and 4 in. 



in diameter. 



8 phyllacantha. 2iin. high, and 



5 in. in diameter. 



9 p. 2 macracantha. Sin. high, 



and Si in. in diameter. 

 10 p. 3 micracantha. 3 in. high, 

 and Si in. in diameter. 



