268 PROCEEDINGS OF THE AMERICAN ACADEMY 



long. Flower 2^ - 2^ inches long, and of same diameter. Seeds a 

 line long. 



§ 3. Ruhrijlorce. 



* Sepalis integerrimis. 



24. M. coNOiDEA, DC. (M, stroblliformis, E. in Wisl. Rejj. non 

 Scheer) : found only south of the Rio Grande. 



* * Sepalis fimhriatis: 



25. ? M. PoTTSii, Scheer : cylindrica, subramosa ; tuberculis ovatis 

 obtusis levissime sulcatis, axillis sublanuginosis ; aculeis radialibus 

 numerosissimis gracilibus albis, centralibus 6-12 validioribus expan- 

 sis basi nodulosis apice sphacelatis ; floribus magnis e viridi rubellis ; 

 baccis roseis. 



Texas, on the Eio Grande, below Laredo, and from there to Chi- 

 huahua. — I have not seen this plant ; the description is taken from 

 Salm and Poselger. 



26. M. TUBERCULOSA, E. in B. C. R. : ovata s. ovato-cylindrica, sim- 

 plex s. ad basin parce prolifera ; tuberculis e basi rhomboidea ovatis 

 abbreviatis obtusis profunde sulcatis demum suberosis persistentibus 

 confertis, axillis villosissimis ;• aculeis exterioribus 20-30 rigidis albi- 

 dis, interioribus 5-9 robustioribus cJEsio-purpureis sphacelatis, su- 

 perioribus longioribus erectis, infimo breviore robusto porrecto s. 

 deflexo ; floribus in vertice densissime tomentoso centralibus pollicari- 

 bus dilute roseis ; baccis elongato-ovatis rubris ; seminibus minimis 

 scrobiculatis. 



On the mountains near El Paso, and eastward. : fl. May and June. 

 Plant 2-5 inches high ; tubercles 24- - 3 lines long, dry and hard, not 

 fleshy unless very young, nor shrivelling when old, but losing the 

 spines and covering the lower part of the plant like corky protuber- 

 ances. Outer spines usually 2-4, rarely 5 or 6, lines long ; interior 

 spines 4-9 lines long ; those of the upper tubercles forming a tuft of 

 grayish-purple color on top of the plant. Flowers very pale purple, one 

 inch in diameter. Berry red, three fourths of an inch long, one fourth 

 of an inch thick, crowned with the remains of the flower. Seeds short, 

 thick, about half a line long. — The short, corky tubercles, with 

 very deep grooves, and very woolly when young, together with the 

 long red fruit, distinguish our species from all the allied forms. 



27. M. DASYACANTHA, E. in B. C. R. : simplex, subglobosa ; tuber- 



