280 PROCEEDINGS OF THE AMERICAN ACADEMY 



South of the Rio Grande, Chihuahua, &c. — The var. /3. from Mon- 

 terey may belong either here or to the next species. The var. y. 

 from Sonora, without any central spines, and with very rigid radial 

 ones, 1 - 4| lines long, is not yet sufficiently known to decide about 

 its affinities. 



6. C. c^spiTOSUS, E, in PI. Lindh. 1845 : ovato-cylindricus, 12 - 

 18-costatus ; areolis lanceolatis ; aculeis radialibus 20-30 rectis seu 

 subrecurvis pectinatis albidis, centrali nullo vel raro, uno alterove bre- 

 vissimo ; tubo floris purpurei pulvillis 80 - 100 aculeolos capillares 

 6-12 obscuros lanamque longam cineream gerentibus dense stipato. 



Var. a. MINOR : aculeis brevioribus gracilioribus non intertextis ; 

 floribus minoribus. 



Var. iS. MAJOR : aculeis longioribus robustioribus intertextis ; flori- 

 bus majoribus. 



Var. y. CASTANEUs: aculeis rubellis seu castaneis. 



From the Canadian near Delaware Mount, to the Rio Grande, and 

 south to Monterey ; west not farther than the San Pedro River: fl. in 

 May and June. — This species, now not rare in cultivation, seems to 

 be sufficiently distinct from the preceding, and may always be recog- 

 nized by the characters indicated. 



7. ? C. ADUSTUS, E. in Wish Rep. : ovatus, 13 - 15 costatus ; areo- 

 lis ovati§ seu ovato-lanceolatis ; aculeis radialibus 16-20 adpressis 

 albidis apice adustis, lateralibus inferioribusque longioribus., summis 

 setaceis brevissimis, centrali nullo seu valido porrecto atrofusco. 



Mountains west of Chihuahua : flower and fruit unknown. — Echi- 

 nocereus radians^ E. is the form with stout central spines. 



8. .? C. RUFispiNtrs, E. 1. c. : ovato-cylindricus, 11-costatus ; areolis 

 lanceolatis; aculeis radialibus 16- 18 adpressis intertextis, lateralibus 

 cseteris multo longioribus fuscis recurvatis, centrali singulo valido 

 fusco porrecto ; flore infundibuliformi, tubo subelongato, limbo pa- 

 tulo ; stigmatibus 8 tenuibus albidis. 



Mountains west of Chihuahua : fl. in I\Iay. — Stem four inches 

 high: radial spines 4-9 lines, central one about an inch, long. 

 Flower difl^erent from that of all other Echinocerei in the lencth of 

 the tube (over 2 inches long, and half as wide) and the whitish stig- 

 mata. Seems to form a transition to other sections of the wenus. 



9. > C. LONGisETUS, E. in B. C. R. : subsimplex, ovato-cylindricus ; 

 costis 11- 14 tuberculatis ; areolis orbiculatis; aculeis setaceis albis. 



