at Hendon Vicarage^ Middlesex. 



317 



20 m. vai\ cristata. 2 in, high, 5 in. 



long, and 2i in. in diameter. 



21 submammulosa. 2 in, high, and 



4 in. in diameter. 



Subsect. 2. OTioiJi'BEm. — Tuber- 

 cles more obtuse. 



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



in diameter. — Syn. Cereus 

 Ononis. 



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



5 in. in diameter. — Syn. E. 

 muricata. 



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



3i in. in diameter. 



25 concinna. 1^ in. high, and 2i in. 



in diameter. 



26 Llnkw. 3 in. high, and 31- in. 



in diameter. — Syn, Cereus 

 LinliM. 



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

 horizontal^ and the lower ones inverted. 



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



in diameter. — Syn. E. acutan- 

 gula; E. rosacea var. Sellow- 

 idiia. 



28 acuata. 3 in. high, and 4^ in. 



in diameter. — Syn. E. Cou- 

 rantiz. 



29 a. var. spinier. 2i in. high, and 



4 in. in diameter. 



30 erinaceus. 5 in. high, and 7 in. 



in diameter. 



31 SeHowza^za. 4 in. high, and 6 in. 



in diameter. 



32 sessiliflora. 3 in. high, and 6 in. 



in diameter. 



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



and 5 in. in diameter. — Syn. 

 E. tetracantha. 



Sect. V. Angles feiv, and mostly robust. 



Subsect. 1. Angles obtuse. Fas- 

 cicles level. 



34 horizonthalonia. 5iin. high, and 



6 in. in diameter. — Syn. E. 

 equitans. 



35 rhodacantha. — Syn. E. coccinea, 



Melocactus rhodacantha. 



Subsect. 



2. Angles more acute. 

 Fascicles teated. 



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

 diameter. — Syn. Melocactus 

 ingens. 



Genus IV. ECHINOFOSSULOCA'CTUS. 



Surface angled or furrowed. Flowers and fruit 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, narrow, deep, and. acute. 

 Generally one or more of the spines in each fascicle flat, or sivord-lilce, and 

 erect. 



Subsect. 1. Angles large. 



1 coptonigona. 3 in. high, and 3 in. 



in diameter. 



2 c. var. major. 3iin. high, and 



5^ in. in 'diameter. 



Subsect. 2. Angles dense, anfrac- 

 tuous. 



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. 3 in. high, and 4 in. 



in diameter. 



7 anfractuosa. 3 in. high, and 4 in. 



in diameter. 



8 phyllacantha. 2iin, high, and 



5 in. in diameter. 



9 p. 2 macracantha. 3 in. high, 



and 3i in. in diameter. 

 10 p. 3 micracantha. Sin. high, 

 and 3i in. in diameter. 



