THB cactaceae;. 



very variable in color and size, lemon-yellow to deep red, 2 to 3 cm. long, sometimes 5 cm. broad when 

 fully expanded; petals obtuse; filaments short; style thick; stigma-lobes very short ; ovary short with 

 few areoles ; areoles on ovary subtended by minute leaves, filled with short wool, the upper ones with 

 bristle-like spines; fruit globular to short-oblong, 2 to 3 cm. long, dry; seeds numerous, 4 to 5 mm. long. 



Type locality: In Bolivia. 



Distribution: Very common on the high pampas of southeastern 

 Peru and Bolivia, and adjacent Argentina. 



Cactus pentlandii Lemaire (Cact. 88. 1868), name only, is sup- 

 posed to apply to this species. 



This is one of the most characteristic plants of the high pampas 

 of the Andean region, mostly growing at elevations of 12,000 feet or 

 higher, forming low, broad, compact clumps, sometimes made up 

 of a hundred plants or more. 



Illustrations: PDict.Gard. Nicholson 2: f. 751 ; PForster, Handb. 

 Cact. ed. 2. f. 124; ?W. Watson, Cact. Cult. f. 77, all as Opuntia 

 boliviana; Monatsschr. Kakteenk. 24: 175, as Opuntia dactylifera. 



Figure 116 represents a joint of the plant collected in 

 19 14 by Dr. Rose at Comanche, Bolivia; figure 117 shows a 

 flowering joint collected by Dr. Rose in 1914, at Juliaca, Peru. 



74. Opuntia ignescens Vaupel, Bot. Jahrb. Engler Beibl. iii : 30. 



1913- 



Plants forming clumps 2 dm. high or less, with hundreds of 

 erector spreading joints; joints bluish green, 8 to 10 cm. long, very 

 fleshy, naked below; upper areoles very spiny; spines 6 to 15 from 

 each areole, nearly equal, 4 to 5 cm. long, erect, acicular, yellow ; 

 flowers very showy, deep red; ovary oblong, 3 to 4 cm. long, naked 

 below, but the upper areoles producing numerous spines 4 to 7 cm. 

 long; fruit red, 7 cm. long, spiny and tuberculate above, terete 

 below, with a deep umbilicus; seeds nearly globular, about 5 mm. 

 in diameter. 



Type locality: Near Sumbay, southern Peru. 

 Distribution: On the pampas of southern Peru and 

 northern Chile, at altitude of 3,000 to 3,600 meters. fig. ns.—Opuntia ignescens. xo.5. 



Fig. 119. — Opuntia ignescens forming large mounds. 



