BRITTON AND ROSE] PERESKIOPSIS 333 



9. PERESKIOPSIS ROTUNDIFOLIA (DC.) Britton & Rose 



Percskia rotundifolia DC. Prod. 3 : 475. 1828. 



Opuntia rotundifolia Schum. Gesam. Kacteen 652. 1901. 



Type locality: Mexico. 

 Distribution : Mexico. 



Illustration: Mem. Mus. Hist. Nat. 17; pi. 20; Schum. Gesam. 

 Kacteen /. pp. 



10. PERESKIOPSIS SPATHULATA (Otto) Britton & Rose 



Pereskia spathulata Otto, Pfeiff. Enum. 176. 1837. 



Opuntia spathulata WebEr, Bull. Mus. Hist. Nat. Paris 4: 165. 1898. 



Type locality : Mexico. 

 Distribution : Mexico. 



11. PERESKIOPSIS VELUTINA Rose, sp. nov. 



Stems weak and spreading, forming compact bushes 9 to 12 cm. 

 high or sometimes higher ; old stems with cherry-brown bark ; young 

 branches green, borne nearly at right angles to the old stem, velvety- 

 pubescent; areoles bearing long white hairs, several short spines, 

 and some bristles; leaves broadly ovate, 2 to 4 cm. long by 1.5 to 

 2.5 cm. broad, mucronate, acute, dull green, more or less velvety- 

 pubescent on both surfaces, or when very young brighter green and 

 quite glabrous, narrowly lanceolate; flowers generally (if not 

 always) sessile on the second year's stems; ovary obovate to oblong 

 in outline, pubescent, bearing large leaves and areoles similar to 

 those of the stem ; leaves spreading or ascending and persisting after 

 the flower falls ; flower bud (above the ovary) 2 to 3 cm. long, acute, 

 the outer sepals green or deep red tinged with yellow ; petals bright 

 yellow. 



Collected by J. N. Rose in hedges about the city of Oueretaro, 

 August 20, 1906 (no. 11,149) 5 living collection: 06.1054. 



This plant is called by the natives "Nopaleta" and "Colo de 

 diablo." 



Type in U. S. National Museum, no. 453,934. 



Plate xliv shows a greenhouse specimen. 



