OPUNTIA. 



109 



94. Opuntia montevidensis Spegazzini, Anal. Mus. Nac. Buenos Aires III. 4: 515. 1905. 

 Cespitose, the branches 3 to 5 dm. high; joints 5 to 10 cm. long, obovate to elliptic; areoles not 



very prominent; spines usually 5, 3 longer and stouter, 2 very small, reflexed, and setiform, the 2 or 



3 longer ones erect or spreading, 2 to 3 cm. long; flowers 4 to 5 cm. broad, orange-colored; fruit 

 dark purple, clavate, 3.5 to 4 cm. long ; seeds lanate. 



Type locality: Cerro de Montevideo, Uruguay. 



Distrihtdion: Cerro de Montevideo, and near La Colonia, Uruguay. 



95. Opuntia retrorsa Spegazzini, Anal. Mus. Nac. Buenos Aires III. 4:517. 1905. 



( ?) Opuntia platynoda Griffiths, Bull. Torr. Club 43: 526. 1916. 

 Stems prostrate, intricately branched, creeping, rooting at the nodes; joints linear-lanceolate, 

 more or less attenuate at each end, flattened; areoles somewhat prominent, each subtended by a 

 long, dull purplish blotch; spines i to 3, reflexed, white below, with pinkish tips; flowers yellowish, 



4 to 5 cm. broad ; fruit about 2 cm. long, violet-purple on the outside, light rose on the inside ; seeds 

 2 to 2.5 mm. broad, somewhat villous. 



Fig. 134. — Opuntia retrorsa. 



Type locality: In the Territory of the Chaco, Argentina. 

 Distribution: Northern Argentina. 



Plate XVIII, figure 2, represents a plant from Argentina which flowered at the New 

 York Botanical Garden in 1911. Figure 134 is from a photograph sent by Dr. Spegazzini. 



96. Opuntia utkilio Spegazzani, Anal. Mus. Nac. Buenos Aires III. 4: 516. 1905. 



Low, creeping plant, rooting at the joints, with elongated branches 5 to 15 dm. long; joints flat, 

 elliptic-linear, 15 to 30 cm. long, 5 to 6 cm. broad; spines at first 2 or 3, the upper one longer, later 

 more numerous, reflexed; flowers small, 3.5 to 4 cm. broad, yellowish; ovary obovoid, somewhat 

 spiny; fruit small, 3 cm. long, fleshy, insipid, reddish violet both within and without; seeds sub- 

 orbicular, 4 mm. broad, lanate. 



Type locality: Province of Tucuman, Argentina. 



Distribution: Northern Argentina. 



Figure 135 is from a photograph sent by Dr. Spegazzini. 

 96a. Opuntia discolor sp. nov. (See Appendix, p. 218.) 



97. Opuntia anacantha Spegazzini in Gosselin, Bull. Mus. Hist. Nat. Paris 10: 391. 1904. 

 Usually decumbent and rooting along the under surface, sometimes ascending and clambering, 



I to 2.5 meters long; joints unarmed, dark green except for purple spots under the areoles, elhptic 

 to lanceolate, narrowed toward each end, 1.5 to 4 dm. long, 3.5 to 7 cm. broad; areoles small; flowers 

 large, numerous, yellowish orange, 4 cm. long, 5 to 6 cm. in diameter; sepals large, reddish, obtuse, 

 emarginate or even 2-lobed; petals 12; style white; stigma-lobes white or rose-colored; fruit 3 cm. 

 long, red, the pulp yellowish or white. 



Type locality: In the southern Chaco, Argentina. 



Distribution: Northeastern Argentina. 



Figure 1 36 is from a photograph of a part of the type plant, received from Dr. Spegazzini. 



