STANDLEY TREES AND SHEUBS OF MEXICO. 861 



3. Pereskiopsis opuntiaeflora (DC.) Britt. & Rose, Smiths. Misc. Coll. 50: 



332. 1907. 



Pereskia opuntiaeflora DC. Prodr. 3: 475. 1S2S. 



Opuntia golziana Schum. Gesamtb. Kakt. 654. 1898. 



Based upon a drawing of a Mexican plant by Sess6 and Mocino, and not 

 otherwise known. 



Shrubby, glabrous ; leaves obovate, mucronate, often in pairs ; spines, when 

 present, solitary, elongate, 2 to 3 times as long as the leaves; flowers sub- 

 terminal, short-pedunculate ; petals numerous, ovate, subacute, reddish yel- 

 low, arranged in two series; ovary leafless, bearing areoles filled with 

 glochids. 



4. Pereskiopsis rotundifolia (DC.) Britt. & Rose, Smiths. Misc. Coll. 50: 



333. 1907. 



Pereskia rotundifolia DC. Prodr. 3: 475. 1828. 



Opuntia rotundifolia Schum. Gesamtb. Kakt. 652. 1898. 



Based upon an illustration by Mociiio and Sesse of a Mexican plant ; per- 

 haps occurring in Oaxaca. 



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

 orbicular, mucronate ; spines elongate, solitary ; flowers 3 cm. broad, borne 

 on the second-year branches; petals reddish yellow, broad, with mucronate 

 tips ; ovary leafy ; fruit obovoid, red, leafy. 



5. Pereskiopsis chapistle (Weber) Britt. & Rose, Smiths. Misc. Coll. 50: 



331. 1907. 



Opuntia chapistle Weber; Goss. Bull. Mus. Hist. Nat. 10: 388. 1904. 



Oaxaca and probably Morelos ; type from Oaxaca. 



A large branching shrub, sometimes 3 to 4 meters high, the branches 

 widely spreading, glabrous; spines single, white, long (6 cm.), very stout; 

 leaves fleshy, somewhat persistent, obovate to elliptic, sometimes nearly 

 orbicular, 3 to 4 cm. long, glabrous ; flowers yellow ; fruit red. " Chapiztli." 



6. Pereskiopsis porteri (T. S. Brandeg.) Britt. & Rose, Smiths. Misc. Coll. 



50: 332. 1907. 



Opuntia porteri T. S. Brandeg.; Weber, Diet. Hort. Bois 899. 1898. 



Opuntia brandegeei Schum. Gesamtb. Kakt. 653. 1898. 



Pereskiopsis brandegeei Britt. & Rose, Smiths. Misc. Coll. 50: 331. 1907. 



Sinaloa and southern Baja California ; type from Sinaloa. 



Stems stout, woody, branching, 60 to 120 cm. high, 3 cm. in diameter, the 

 old areoles bearing 3 to 8 stout spines 3 to 5 cm. long, but on the trunk 

 often 15 to 20 spines from an areole ; first and second-year branches usually 

 short, spineless or with 1 or 2 brown spines, those of the first year green, of 

 the second year brownish ; areoles bearing numerous small brown glochids ; 

 leaves sessile, 2 to 3 cm. long, obovate, acute, fleshy; flowers about 4 cm. 

 in diameter ; sepals few, spatulate, short ; petals few, yellow, broad, entire ; 

 fruit joint-like, oblong, 4 to 5 cm. long, orange-colored, with large areoles 

 bearing brown glochids; seeds 1 or few, covered with white deciduous hairs. 

 " Alcajer " (Baja California). 



The fruit is said to be edible but very sour. 



7. Pereskiopsis spathulata (Otto) Britt. & Rose, Smiths. Misc. Coll. 50: 



333. 1907. 

 Pereskia spathulata Otto; Pfeiff. Enum. Cact. 176. 1837. 

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

 Collected many years ago in Mexico, "but without definite locality. 



