OF ARTS AND SCIENCES. 



287 



radialibus 40 - 50 stellatis, centrali unico longiore robustiore ; flore 

 flavo breviusculo ; bacca aculeatissima ; seminibus magnis lucidis. 



On hills near San Diego, California, growing in thick patches. — 

 Stems several feet long ; branches 6-9 inches high, 1^ inches in 

 diameter. Fruit very spinose, with seeds over one line in length. 



27. C. VARIABILIS, PfeifT. : erectus, 3-4 angulatus ; areolis remo- 

 tis ; aculeis 4-6 brevibus radiantibus, 2-4 interioribus validis elon- 

 gatis ina3qualibus divaricatis, centrali deflexo ; flore magno albo noc- 

 turno ; bacca coccinea aculeolata ; seminibus magnis Isevibus. 



On the lower Rio Grande: fl. in May and June. — Well known 

 from all parts of tropical America. Fruit 3 to 10 feet high, 2 inches 

 in diameter; larger spines 12-18 lines long. Fruit 2-3 inches 

 long, nearly 2 inches in diameter. 



28. C. Greggii, E. in Wisl. Rep. : gracilis, e radice crassa napi- 

 formi erectus ; ramis 3-6-angulatis, rufescentibus ; areolis confertis ; 

 aculeis e basi bulbosa abrupte subulatis brevissimis nigricantibus, ra- 

 dialibus 6-9, centralibus 1 - 2 ; floris elongati albidi tubo aculeolis 

 capillaceis flexuosis munito ; bacca sessili obovata apice rostrata ; 

 seminibus rugosis. 



Var. a. cisMONTANUS : areolis elongatis ; petalis latioribus. 



Var. /3. TKANSMONTANUS : areolis ovato-orbiculatis ; petalis angusti- 

 oribus. 



From Western Texas to Sonora, and south to Chihuahua : fl. May 

 and June. — Root a large fleshy tuber, sometimes 6 inches in diame- 

 ter. Stems 2-3 feet high, 9-12 lines thick, usually 4- or 5-angled ; 

 spines ^ - 1 line long, very sharp ; lower ones longer. Flower 6 or 

 8 inches long, 2-2^ wide. Fruit 1 - H inches long. Seed 1| - 1| 

 lines long. 



Subgen. 3. Lepidocekeus. Caulis elongatus : fasciculi aculeo- 

 rum steriles et florigeri similes : floris tubus brevior squamosus : 

 phylla numerosissima : stigmata pallida : semina Isevia : embryo ha- 

 matus. 



29. C. GiGANTEUS, E. in Emory's Rep. 1848 : erectus, elatus, 

 parce erecto-ramosus, 18-21-costatus ; aculeis 12-16 radialibus 

 insequalibus, centralibus sub-6 robustis basi bulbosis cornels basi nigris 

 cseteros superantibus, infimo longiore deflexo ; floribus subterminalibus 

 albidis ; bacca obovata demum 3 - 4-valvi. 



From the Lower Gila north to Williams's River (better known 



