ILLUSTRATED STUDIES IN THE GENUS OPUNTIA. 



267 



joint than on sides, often distinctly subareolate and developing new wool 

 and spicules from season to season; spicules yellow, unequal, scattered, 



with 



with 



pinkish throughout, one on lower portion of joint to 7 above, commonly 

 3 to 6, the longest 2.5 cm. long, ercct-divergcnt or often the lower re- 

 curved especially on edges of joints, angular flattened, very stout and 

 formidable but neither annular nor twisted; flowers lemon yellow with 

 bases of petals a darker orange; filaments greenish-white, style white, and 

 stigma dark green, 8-parted; fruit obovate to pyriform, deep, dark red 

 throughout, 6 to 7 cm. in length. 



The species differs from 0. cycloides in character of spines. 

 In this species they are much shorter and more 



Description drawn 

 to the shape of the joints. 



The specific name refers 



The type is no. 7790 D. G., collected in the foothills of the 

 Santa Rita Mountains, Arizona, April, 1905.— Plate 27, 

 upper figure. 



Opuntia ferruginispina sp. nov. 



Plant erect-ascending with open-brancliing habit, 7 to 12 dm. in height 

 and same or greater in breadth; joints broadly obovate, about 20 by 23 

 cm. in last year's growth, deep blue-glaucous green; areoles about 3 to 3.5 

 cm. apart, obovate, 6 to 10 mm. in longest diameter, gray to black, en- 

 larging with age; spicules bright reddish-brown, numerous, unequal, 

 formidable, often 12 mm. long but usually much shorter; spines numerous 



formidable 



with 



twisted, faintly annular, diverging in all directions or often the lower re- 



about 



em. long, both spines and spicules increasing in numbers with age and 

 enlarging the areole; flowers orange-red, about 7.5 cm. in diameter when 

 open; petals broadly obovate, rounded above, with edge irregularly and 



sly toothed and often slightly crenulate and with midrib terminating 

 minutely cuspidate point often having a tinge of purple in its 

 lower portion ; sepals (second row), triangular-winged, greenish; filaments 

 yellow with faint tinge of purple; pistil 3 to 3.5 cm, long; style white 



minu 

 in a 



with 



stigma 



ovary 



with 



paratively distant and bearing a small tuft of reddish brown spicules of 



igul 



s species differs from 0. Lindheimeriy with 

 confused, in color of plant body, color and 



