I 



BRITTON AND ROSE] OPUNTlOIDEA£ OF NORTH AMERICA 521 



Type in N. Y. Botanical Garden. Collected between Gonaives and 

 La Hotte Rochee, on road to Terre Neuve, Haiti (Nash & Taylor, 

 1587, August 12, 1905). 



Differs from the following species by its turgid joints and more 

 slender spines. 



OPUNTIA TRIACANTHA (Willd.) DC. 



Cactus triacanthos Wiujx Enum. Suppl. 34. 1813. 

 Opuntia triacantha DC. Prod. 3: 473. 1828. 



Type locality: Not cited; cultivated in the Berlin Garden. 



Distribution : Windward Islands, St. Martin to Guadeloupe. 



Professor Schumann's description apparently includes two species, 

 one of which belongs here and one in the Albispinosae. Index 

 Kewensis indicates O. triacantha as a synonym of 0. curassavica, 

 which is improbable. 



OPUNTIA PES-CORVI Le Conte 



Opuntia pes-corvi LE Conte; Chapm. South. Fl. 145. i860. 



Type locality : Barren sandy places along the coast, Florida and 

 Georgia. 



Distribution : Coast of the Southeastern States. Reported from 

 Bermuda, but probably erroneously. 



OPUNTIA PUMILA Rose, sp. nov. 



Stems low, 30 to 60 cm. high, much branched, the branches readily 

 falling off when touched, velvety pubescent; joints terete in section, 

 or turgid and slightly flattened ; areoles small, bearing on old stems 

 several slender spines, the longer ones 3 cm. long; areoles on young 

 joints usually 2, yellowish; ovary pubescent, with few spines or 

 none; petals yellow tinged with red, 15 mm. long; fruit globular, 

 red, 15 mm. long. 



Type in U. S. National Herbarium, no. 454,096, collected by J. N. 

 Rose near Oaxaca City, on the road to Mitla, September 5, 1907 

 (no. 11,306). 



For the present we base this species on specimens from a single 

 locality. Our material, however, shows that it, or a group of closely 

 related species, ranges from north Mexico to Guatemala. The 

 specimens examined are all very similar in habit, with narrow, 

 nearly terete branches, but in other respects differ considerably, some 

 being glabrous, while others are velvety-pubescent. We have as- 

 signed the species a place in the series Divaricatae, but it seems to 

 resemble some South American species, notably O. aurantiaca, more 

 closely than any North American type. 



