64 



THE CACTACEAE. 



Illustrations: Pfeiffer and Otto, Abbild. Beschr. Cact. i: pi. 13; Abh. Bayer. Akad. 

 Wiss. Miinchen 2: pi. i, vii. f. 6; Riimpler, Sukkulenten 196. f. 109, as Mammillaria 

 uberiformis. 



Figure 62 is reproduced from the first illustration cited above. 



13. SOLISIA gen. nov. 



Plants very small, solitary, globular, tuberculate, milky; tubercles not arranged in ribs, small 

 covered by broad pectinate spines; areoles very narrow and long; flowers lateral, yellow, small 

 borne in axils of old tubercles; axils of tubercles neither hairy nor woolly; fruit naked, small, oblong; 

 seeds black, smooth, dome-shaped with a broad basal hilum. 



The type species, Pelecyphora pectinata B. Stein, is here segregated irom. Pelecyphora, 

 with which it has little in common ; it differs in being solitary, not cespitose, and in having the 

 juice milky, not watery ; the flowers small, lateral and yellow, not large, central and purple ; 

 the axils of the tubercles naked, not woolly; and the hilum of the seed broad and large, 

 not small. 



Fig. 62. — Dolichothele uberiformis. 



Fig. 63. — Solisia pectinata. 



The genus is named in honor of Octavio Solis of the City of Mexico, an earnest student 

 of the cacti. Only one species is known. 



1. Solisia pectinata (B. Stein). 



Pelecyphora pectinata B. Stein, Gartenflora 34: 25. 1885. 



Pelecyphora aselliformis pectinifera Riimpler in Forster, Handb. Cact. ed. 2. 238. 1885. 



Pelecyphora aselliformis pectinata Nicholson,* Diet. Gard. 4: 585. 1888. 



Pelecyphora aselliformis cristata Watson. Cact. Cult. 190. 1899. 



Mammillaria pectinifera Weber, Diet. Hort. Bois 804. 1898. 



Plants I to 3 cm. in diameter, fibrous-rooted, entirely hidden by the large overlapping spine- 

 clusters; areoles narrow and long; spines 20 to 40, aU radial, 1.5 to 2 mm. long, white, appressed; 

 flowers small; fruit 6 mm. long; seed i mm. long. 



Type locality: Mexico. 

 Distribution: Tehuacan, Mexico. 



The cristate form of this species, when grown as a graft on some of the Cereus allies, 

 becomes much larger than the normal form. 



* Haage (Cact. Kultur ed. 2. 206. 1900) credits the variety to Ehrenberg. 



