OPUNTIA. 



107 



Key to Species. 



Joints not conspicuously purple-blotched under the areoles. 

 Joints linear, elongated. 



Stem terete or subterete; branches mostly flat. 



Joints dark green, not tubercled 9°- 



Joints tubercled, bluish green when young 91- 



All the joints flat. 



Joints elongated, hnear 92- 



Joints linear-oblong. . . 93- 



Joints short, elliptic 94- 



Joints with a long purplish blotch under each areole. 

 Joints more or less spiny. 

 Joints flattened. 



Joints 2 to 3.5 cm. wide 95- 



0. aurantiaca 



0. schickendantzii 



0. kiska-loro 



O. canina 



O. montevidensis 



0. retrorsa 



Joints 3.5 to 6 cm. wide 96. 0. utkilio 



0. discolor 

 0. anacantha 

 0. grosseiana 



Joints subterete, turgid > 960. 



Joints spineless 97- 



Perhaps of this series 



90. Opuntia aurantiaca Lindley, Edwards's Bot. Reg. 19 : 

 pi. 1606. 1833. 

 Opuntia aurantiaca extensa Salm-Dyck in Forster, Handb. 

 Cact. 476. 1846. 



Low, much branched, and spread- 

 ing; stem terete or subterete, i to 2 

 cm. thick; joints very fragile, linear, 

 6 to 8 cm. long, 1.5 to 2.5 cm. broad, 

 almost terete at base, dark green, shin- 

 ing; areoles somewhat elevated, filled 

 with white wool; spines 2 or 3, brown- 

 ish, I to 3 cm. long; flowers yellow, 2.5 

 cm. broad; fruit 2 to 2.5 cm. long. 



Type locality: Chile (in error). 



Distribution: Argentina and 

 Uruguay. 



Cactus aurantiacus Lemaire 

 (Cact. 87. 1868) is usually cited in 

 synonymy, but Lemaire only men- 

 tions the name as a species of 

 Cactus. It is in fact Gillies's man- 

 uscript name, first pubhshed in 

 the Botanical Register in 1833 

 as a synonym of 0. aurantiaca. 



0. extensa Salm-Dyck (Pfeif- 

 fer, Enum. Cact. 147. 1837) is also 

 given as a synonym. 



Remy states (Gay, Fl. Chilena 

 3: 25. 1847) that it grows in the 

 central provinces of Chile, but he 

 probably had in mind some other plant, as 0. aurantiaca is not known to be native of Chile 

 by resident botanists. 



Illustrations: Anal. Mus. Nac. Montevideo 5: pi. 34; Edwards's Bot. Reg. 19: pi. 1606. 



Figure 130 represents a joint from a plant found by Dr. Rose, in Argentina, in 19 15. 

 91. Opuntia schickendantzii Weber in Schumann, Gesamtb. Kakteen 688. 1898. 



Shrub-like, i to 2 meters high, much branched, grayish green; branches cylindric or flattened, 

 somewhat tuberculate; leaves minute, 2 mm. long, reddish; spines i or 2, subulate, i to 2 cm. long; 

 flowers 4 cm. in diameter, yellow; fruit green, sterile. 



Type locality: In Tucuman, Argentina. 



Distribution: Northern Argentina. 



Figure 131 is from a photograph of a plant in Argentina contributed by Dr. Spegazzini. 



Fig. 130. — O 

 aurantiaca. 



Fig. 131. — O. schickendantzii. 



