OF ARTS AND SCIENCES. 271 



II. ECHINOCACTUS, Link. & Otto. 



Ovarium emersum baccaque sepalis stipata. Semina scepe albnmi- 

 nosa. Cotyledones plus minus foliacece plerumque hamatse. — Plan- 

 tse subglobosoe, costatae ; inflorescentia vertical!. 



§ 1. Hamati, Salm. 



1. E. ScHEERii, Salm : globosus s. ovatus ; costis 13 obtusis inter- 

 ruptis ; tuberculis supra ad medium sulcatis ; aculeis radialibus 15 - 

 18 setaceis, centralibus 3-4 angulatis variegatis, superioribus rectis 

 longioribus sursum divaricatis, inferiore robustiore breviore hamato ; 

 floribus minoribus flavo-virescentibus ; bacca virescente ; seminibus 

 fuscis. 



About Eagle Pass, on the Rio Grande : fl. August to October. — A 

 most elegant little species, l|-2 inches high; larger spines black 

 and white variegated; radial ones 3-6, central ones 6-12 lines 

 long; floriferous areola united by a groove of 1-2| lines in length 

 with the spines, resembling the groove of the CoryphanthcB, especial- 

 ly of Mamillaria macromeris. Green flower an inch long, much 

 less in diameter. 



2. E. BREVi-HAMATUS, E. in B. C. R. : obovato-globosus ; costis 13 

 compressis obtusis interruptis ; tuberculis supra usque ad basin sulca- 

 tis ; aculeis radialibus 12 teretibus albidis, centralibus 4 complanatis, 

 lateralibus rectis sursum versis pauUo longioribus, summo debiliore 

 et infimo robustiore deorsum hamato brevioribus ; floribus minoribus 

 rose is. 



On the San Pedro, and about Eagle Pass : fl. April. — Very similar 

 to the last; but larger, 3-4 inches high, with fewer spines, the lower 

 central usually hardly longer than the upper radial ones, about one 

 inch long ; lower radial spines shorter, and upper central ones longer. 

 The rose-colored flowers are 12 - 16 lines long, much less wide. 

 Fruit unknown. 



3. E. Whipplei, E. &b B. in Pacific R. R. Rep. : ovato-globosus ; 

 costis 13 - 15 interruptis ; aculeis radialibus 7 compressis albidis, 

 centralibus 4 longioribus robustioribus compresso-quadrangulatis, sum- 

 mo latiore longiore, infimo robustiore deorsum hamato ; seminibus 

 magnis nigris. 



On the Colorado-Chiquito, in Western New Mexico. — Plant 3-5 

 inches high ; exterior spines 6-9 lines, upper central spine 12- 18 



