OPUNTIA. 



99 



Plate XVI, figure 3, represents old and young joints of the plant collected above Ay- 

 rampl, Peru, by Dr. Rose in 1914. Figure i 18 shows a fruit from the same plant; figure 119 

 is from a photograph taken by H. I^. Tucker at Coropuna, Peru, in 191 1. 



75. Opuntia campestris sp. nov. 



Much branched, often forming low, dense masses, 3 to 6 dm. in diameter; terminal joints readily 

 breaking off; joints globular or a little longer than thick, 3 to 5 cm. long, with numerous prominent 

 areoles, the tubercles conspicuous when young; leaves minute, i to 1.5 mm. long, caducous; glochids 

 conspicuous, numerous, yellow; spines usually wanting at the lower areoles, present above, very 

 unequal, 5 to 10, acicular, the longest ones 3.5 cm. long; flowers rosy white to light yellow, 2 to 3 cm. 

 long; ovary naked or spiny; fruit thicker than long, 2.5 cm. long, with deep umbilicus, often very 



spmy 



Common just below railroad station at 

 Pampa de Arrieros, Peru, where it was col- 

 lected by Dr. Rose, August 23, 1914 (No. 18957). 



Figure 120 represents joints of the type 

 specimen above cited. 



Fig. 120. — Opuntia campestris. Xo.8. 



Fig. i2i.-T^Opuntia ignota. Xo.8 



( 



\ 



■gnota 



much 



rplish 



leaves mmute, oiien purpnsn spmc& :^ tu / xxw^^ ^...^^ , ^^-^ , - - ^^^" „^ f^,,;f tir^f 



5 cm. long; glochids, when present, yellow; areoles large, full of grayish wool; flowers and fruit not 



seen. 



Dr 



Pampa 



Peru, August 



grown in greenhouses are dark green 



This plant grows in the same region as 0. campestris, but is quite different from 



some 



the type specimen aoove 



Subgenus 3- PLATYOPUNTIA 



'^ "" -?d joints; a few s^. ^ . 



Twenty-eight series are recognized 



terete 



The species 



ZY^ nave some ui tiic juihl^ c^^i^^^. y *^ . r j i . :♦, CrwufVi AmAnVo 



most abundant in North America, but several senes_are ound only m South Amenca , 



Amencas 



(See Key to the Series 



V 



