276 PROCEEDINGS OF THE AMERICAN ACADEMY 



* * Eriocarpi. 



14. E. POLYCEPHALUS, E. & B. in P. R. R. : ovatus seu demum 

 cylindricus, e basi ramosus ; costis 13-21 acutis ; aculeis robustis 

 compressis annulatis plus minus curvatis rubellis, radialibus 4-8, in- 

 fimo deficiente, superioribus (si exstant) gracilioribus ; centralibus 4 

 angulatis compressis, superiore latiore suberecto vel sursum curvato, 

 inferiore longiore decurvo ; floribus flavis dense lanatis ; bacca sicca ; 

 seminibus magnis angulatis. 



On the Mojave, Colorado, and Gila Rivers : fl. February and 

 March. — Single only when young, forming bunches of 20-30cy- 

 lindric equal-sized heads when older ; the largest seen were 2 - 2| 

 feet high and about 10 inches in diameter. Exterior spines 1-2, in- 

 terior ones 1|-3|, inches long. — Shape very much like the last, 

 but the flower very distinct. 



15. E. Parryi, E. in B. C. R. : simplex, globosus vel depressus ; 

 costis 13 acutis ; aculeis robustis angulatis annulatis albidis, radialibus 

 8-11, rectis s. paullo curvatis superioribus gracilioribus, infimo defi- 

 ciente, centralibus 4 paullo longioribus robustioribus, infimo longiore 

 decurvo ; bacca sicca dense lanata. 



West and southwest from El Paso. — Plant always single ; largest 

 specimens 8-12 inches high by 10 - 15 in diametei'. — Very similar 

 to the last ; but apparently distinct by the manner of growth and the 

 white spines. Unfortunately, no seeds were collected. 



16. E. HORizoNTHALONius, Lcm., var. centrispinus, E, in B. C. R. : 

 glaucus, depressus seu demum ovatus ; costis 8 obtusissimis latissimis ; 

 areolis orbiculatis basi truncatis; aculeis robustis compressis annulatis 

 recurvatis rubellis demum cinereis, radialibus 5-7 superioribus de- 

 bilioribus, infimo deficiente, centrali singulo robustiore decurvato ; 

 floribus purpureis dense lanatis ; bacca sicca lanata ; seminibus mag- 

 nis angulatis. 



From Douana, above El Paso, to the Pecos, and southward : fl. 

 April and May. — Plant 2-8 inches high and 3 - 6 in diameter; 

 spines f - 11 inches long, nearly equal. Flower 2| inches long, but 

 partly enveloped in dense wool. The original E. liorizonthalonius is 

 said to have no central spine, and linear-lanceolate acuminate pale 

 rose-colored petals : in our plant the petals are oblong-lanceolate and 

 obtuse. 



17. E.Texensis, Hopf. (E. Lindheimeri, E. in PL Lindh. 1845) : 



