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OPUNTIA. 



107 



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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 90. 0, auranliaca 



Joints tubercled, bluish green when young 01. 0. schickend<intzii 



All the jomts flat. 



Joints elongated, linear 92. 0. kiska-loro 



Jomts hnear-oblong . . . 93. q, canina 



^ Joints short, elhptic 94. 0. monievidensis 



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. retrorsa 



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



Joints subterete, turgid 96a. 0. discolor 



Joints spineless 97. 0. anacantha 



Perhaps of this series 98. 0. grosseiana 



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



pL 1606. 1833. 



Opuntia auranliaca extensa Salm-Dyck in Forster, Handb. 

 Cact. 476. 1846. 



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Low, much branched, and spread- 

 ing; stem terete or subterete, i to 2 

 cm. thick; joints very fragile, hnear, 

 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 pubUshed in 

 the Botanical Register in 1833 

 as a synonym of O. aurantiaca. 



O. 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 Fig. 130—0. 

 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: pl- 34; Edwards's Bot. Reg. 19: pi- 1606. 

 Figure 130 represents a joint from a plant found by Dr. Rose, in Argentma, m 1915. 



aurantiaca. 



Fig. 131. — O. schickendantzii. 



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



1898. 



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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, 1 to 2 cm. long; 

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



Type locality: In Tucuman, Argentina. 



Distribution: Northern Argentina. , , t^ o 



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



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