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198 



THE CACTACEAE. 



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cm. long, strongly tuberculate, with some of the spmes very strong, tlattenei 



very spiny; the seeds are 8 mm. broad, angled, with margins 



acute. This may be the plant Usted in Weinberg's catalogue, also from 



the name of Opuntia hochderf^ 

 Opuntia xcrocarpa Griffiths (Proc. Biol. Soc. Washingt 



from Kingman 



from 



its dry-fruited allies by its spines, shape of joints and color of plant body. 



Illustrations: Pac. R. Rep. 4: pi. 15, f. 5 to 7; pi. 23, f. 15. 

 Figure 2a^ is conied from the first illustration above cited. 



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7 222. Opuntia rhodantha Schumann, La Semaine Hort. 1897. 



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Opuniia xanlhostemma Schumann, Gesamtb. Kakteen 735. 1898. 

 Opuntia utahensis J. A. Purpus, Monatsschr. Kakteenk. 19: 133. 1909. 



Joints obovate to oblong, 5 to 12 cm. long; areoles distant, 10 mm. apart or more; spines rather 

 stout, 3 or 4, 2 to 3 cm. long, brownish, with 2 or 3 short accessory ones; lower areoles usually naked; 

 glochids brown; flowers, including ovaries, 5 to 6 cm. long, 8 cm. broad; petals red or pink to salmon- 

 colored, obovate, apiculate; stamens red or yellow; fruit spiny; seeds small, 5 mm. in diameter. 



Type locality: Colorado, at 2,000 to 2,300 meters altitude. 

 Distribution: Western Nebraska, Colorado, and Utah. 



After a careful examination of living plants of both 0. rhodantha and 0. xanthostemma, 

 we feel cofivinced that the latter is only a form of the other. The color of the stamens in 



the opuntias does not furnish a constant character. It is hardy in cultivation at New York 

 and highly ornamental when in bloom. 



Haage and Schmidt, in their 1915 cata- 

 logue, list several varieties of this species: 

 brevispina, flavispina, pisciformis, and schu- 



manniana; and under Opuntia xanthostemma 

 in the same place they list the following 

 varieties: clegans, Jul gens, gracilis, orbicularis, 

 and rosea. 



I \ 



Illustrations: yieehan's Monthly 7: 133; 

 Gartenwelt i : 83, this last as Opuntia xantho- 

 stemma; Monatsschr. Kakteenk. 19: 135, this 

 last as Opuntia utahensis.' 



Plate XXXV, figure 2, represents a flower- 

 ing plant received by thie New York Botanical 

 Garden from Haage and Schmidt, of Erfurt, 

 Germany, in 1 913. 



Fig. 246. — Opuntia sphaerocarpa. Xo.66. 



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223. Opuntia sphaerocarpa Engelmann and Bigelow, Proc. Amer. Acad. 3: 300. 1856. 



Small, spreading plants; joints orbicular, 6 to 7 cm. broad, thickish, strongly tuberculate, 

 wrmkled m drying, light green or becoming more or less purple; areoles 8 to 10 mm. apart, mostly 

 spmeless or the upper and marginal ones bearing short acicular spines, the longest ones about 

 2 cm. long; glochids yellow; flowers not known; fruit naked, 18 mm. in diameter, with a truncate 

 umbilicus; seeds 5 mm. broad, very irregular. 



Type locality: Mountains near Albuquerque, New Mexico 



from 



We 



some New Mexican specimens 



with this species, 



Illustrations: Pac. R. Rep. 4: pi. 13, f. 6, 7; pi. 24, f. 3. 



from 





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