278 PROCEEDINGS OF THE AMERICAN ACADESIY 



E. UNGXJispmus, E. in Wisl. Rep., from the countiy between Chi- 

 huahua and Parras, belongs here. The fruit described as belonging 

 to this species is that of E. uncinatus. 



Subtrib. 2. CoNTRARiEiE. Cotyledones facie hilum versus spectan- 

 tes, lateribus seminis parallelse. 



III. CEREUS, Haw. 



Ovarium baccaque sepalis squamiformibus in axillis plerumque pul- 

 villigeris stipatse. Stamina tubo floris breviori seu elongato infun- 

 dibuliformi gradatim adnata. Semina fere exalbuminosa. Cotyle,- 

 dones abbreviates seu foliacese, plerumque hamatas. — Plantse cos- 

 tatffi, inflorescentia laterali. 



Subgen. 1. Echinocereus, E. in Wisl. Rep. : ovarium aculeola- 

 tum : tubus floris abbreviatus, subcampanulatus : stigmata crassa viri- 

 dia : semina tuberculosa : cotyledones suberectse. — Plantse humiles, 

 saepe subglobosce, e basi ramosse vel ramosissimse. 



§ 1. Pectinati, multicostati ; areolis confertissimis plerumque elon- 

 gatis, aculeis rigidis brevibus pectinatis. 



* Viridijlori. 



1. C. viRiDiFLOKUS, E. in Wisl. Rep. : ovatus seu demum cylin- 

 dricus, simplex vel parce ramosus ; costis sub-13; areolis ovato-lance- 

 olatis ; aculeis arete radiantibus 12 - 18 cum superioribus 2-6 setaceis, 

 lateralibus casteris longioribus, inferioribus plerumque purpureo-fuscis, 

 cseteris albidis, central! plerumque nuUo, subinde singulo robustiore 

 variegate ; floribus versus apicem lateralibus e flavo virescentibus 

 minoribus ; baccis ellipticis parvis ; seminibus tuberculatis. 



Var. a. MINOR : subglobosus ; aculeis gracilibus brevibus. 



Var. /3. CYLiNDRicus : major, elongatus ; aculeis rigidioribus longi- 

 oribus. 



Throughout Western Texas and New Mexico. Var. a. about Santa 

 Fe and northeastward : /3. east of El Paso. Fl. May and June. — 

 The small form is 1 -2 inches high, with spines rarely more than 2 

 lines long: the larger form, /3. is 3-6 or more inches high, its 

 spines 2-5 or 6 lines long : central spines, when present, longer and 

 stouter. Flower about 1 inch long. 



2. C. CHLORANTHDS, E. in B. C. R. : cylindricus, simplex, seu parce 

 ramosus; costis 13-18; areolis ovatis ; aculeis laxe radiantibus 12- 



