PERESKIOPSIS. 



29 



Type locality: In Mexico. 



Distribution: Probably southern Mexico, but no definite locality is known. 



There is some confusion in the literature of this species; Schumann describes it as 

 pubescent, while in the original description nothing is said about pubescence ; this error 

 is probably due to a misidentification, for Dr. Rose found in the Museum of Paris two 

 specimens collected by Diguet at Guadalajara, Mexico, which were labeled Opuntia 

 spathulata, and which have pubescent branches and leaves; these are undoubtedly 0. diguetii. 



Pereskia crassicaulis Zuccarini (Pfeiffer, Enum. Cact. 176. 1837) was never published, 

 simply being given as a synonym of P. spathulata. 



8. Pereskiopsis pititache (Karwinsky) Britton and Rose, Smiths. Misc. Coll. 50:332. 1907. 



Pereskia pititache Karwinsky in Pfeiffer, Enum. Cact. 176. 1837. 



Pereskia calandriniaefolia Link and Otto in Salm-Dyck, Cact. Hort. Dyck. 1849. 252 



ing to Schumann.) 

 Opuntia pititache Weber, Bull. Mus. Hist. Nat. Paris 4: i65. 189S. 



1850. (Accord- 



Stems rather low and somewhat branching; bark light brownish and flaking off'; areoles on 

 main trunk each bearing i to 4 slender acicular spines and a small cluster of yellowish glocliids; 

 branches, even when several years old, bearing a single long, acicular spine from an areole and 

 no glochids; young and growing branches rather slender and green, their areoles small, black in 

 the center, with long, white hairs from their margins and no spines; leaves obovate or oblong- 

 obovate, 4 cm. long or less, pale green, thin, acute or bluntish at the apex, narrowed at the base. 



Type locality: In Mexico. 



Distribution: Uncertain, but reported from southern Mexico. 



In the original description this species is said to have a very spiny, erect woody trunk, 

 the branches spreading nearly horizontally, the spines unequal, 3 to 6, 25 to 37 mm. long, 

 the leaves fleshy, green, lanceolate to ovate, 37 mm. long, 16 mm. broad. It was named by 

 Baron Wilhelm von Karwinsky and probably collected by him in Mexico, but no definite 

 locality was given ; Weber states it is from Tehuantepec, while Schumann gives Tehuacan 

 on a statement of Weber. 



Pereskia calandriniaefolia we have referred here, follow- 

 ing Schumann, but the original description is somewhat dif- 

 ferent from that of P. pititache, the leaves being described 

 as spatulate to lanceolate, strongly narrowed below, 7.5 

 cm. long. 



Our description is mostly drawn from specimens grow- 

 ing in the New York Botanical Garden obtained from 

 M. Simon, of St. Ouen, Paris, in 1901. 



Illustrations: Abh. Bayer. Akad. Wiss. Miinchen 2 : pi. i, 

 sec. 6, f. I, 2; pi. 2, f. 9, both as Pereskia pititache. 



Plate III, figure 3, represents a leafy shoot of a plant 

 sent by M. Simon, of St. Ouen, Paris, France, to the New 

 York Botanical Garden in 1901. 



9. Pereskiopsis aquosa (Weber) Britton and Rose, Smiths. Misc. 

 €011.50:331. 1907. 



Opuntia aqiiosa Weber, Bull. Mus. Hist. Nat. Paris 4: 165. 1898 



Shrub, with glabrous, glaucous, green branches, the young 

 shoots with long white hairs at the areoles; leaves bright green, 

 nearly elliptic, acute, about twice as long as wide, narrowed at the 

 base, glabrous; spines usually solitary, standing at right angles to 

 the stem, white; glochids few, yellow; flowers yellow; outer petals 

 blotched with red; fruit pear-shaped, 4 to s cm. ong, 2 to 2.s -a,^ n ,■ ■ 



,. ',. ^ t- ' T o o> J I.rG, 27. — Pereskiopsis aquosa. 



cm. m diameter, yellowish green. X0.66. 



