pErEskiopsis. 27 



Cactus opuniiaeflorus Mocino and Sesse (Pfeiffer, Enum. Cact. 178. 1837) was published 

 as a synonym of Pereskia opuniiaeflora. 



Illustrations: Forster, Handb. Cact. ed. 2. f. 137; Mem. Mus. Hist. Nat. Paris 17: 

 pi. 19, both as Pereskia opuniiaeflora. 



Figm^e 23 is copied from the second illustration above cited. 



4. PeresMopsis rotundifolia (De Candolle) Britton and Rose, Smiths. Misc. Coll. 50:333. 1907. 



Pereskia rotundifolia De Candolle, Prodr. 3: 475. 1828. 

 Opmitia rotundifolia Schumann, Gesaratb. Kakteen 652. 1898. 



Stem thick, more or less woody; branches slender, glabrous; leaves nearly orbicular, mucronate; 

 spines elongated, solitary ; flowers 3 cm. broad, borne on the second-year branches ; petals reddish 

 yellow, broad, with mucronate tips; ovary leafy; fruit obovoid, red, leafy. 



Fig. 22. — Pereskiopsis Fig. 23. — Pereskiopsis opuntiae- Fig. 24. — Pereskiopsis 



diguetii. X0.5. flora. X0.5. rotundifolia. X0.5. 



Type locality: In Mexico. 



Distribution: Known only from the original description and, apparently, from Oaxaca, 



Cactus frutescens Mocifio and Sesse (Pfeiffer, Enum. Cact. 178. 1837) and Cactus 

 rotundifolia Mocino and Sesse (De Candolle, Prodr. 3: 475. 1828) were given as synonyms 

 of Pereskia rotundifolia, but were never published. 



Illustrations: Mem. Mus. Hist. Nat. Paris 17: pi. 20, as Pereskia rotundifolia; Schu- 

 mann, Gesamtb. Kakteen f. 99, as Opuntia rotundifolia. 



Figure 24 is copied from the first illustration above cited; figure 25 is from a pho- 

 tograph taken by Dr. MacDougal at Oaxaca, Mexico, in 1906. 



5. Pereskiopsis chapistle (Weber) Britton and Rose, Smiths. Misc. Coll. 50: 331. 1907. 

 Opuntia chapistle Weber in Gosselin, Bull. Mus. Hist. Nat. Paris 10: 388. 1904. 



A large, branching shrub, sometimes 3 to 4 meters high, the branches widely spreading, glab- 

 rous; spines single, white, long (6 cm. long), very stout; leaves fleshy, somewhat persistent, obovate 

 to elliptic, sometimes nearly orbicular, 3 to 4 cm. long, glabrous; flowers yellow; fruit red. 



Type locality: In Oaxaca. 



Distribution: Oaxaca and perhaps Morelos, Mexico. 



Illustration: Bull. Soc. Nat. Acclim. France 52: f. 10, as Opuntia chapistle. 

 Plate III, figure 2, represents a leafy branch of a plant collected by Dr. Rose at 

 Cuernavaca, Mexico, in 1906. 



