I30 



THE CACTACEAE. 



»V^ 



y *- ; 





121. Opuntia austrina Small, Fl. Southeast. U^ S. 8i6. 1903- 



Opuntia youngii C. Z. Nelson, Chicago Examiner. June 13, 1915. 



Roots fusiform or tuberous, resembling sweet potatoes, often 4 to 6 cm. in diameter, 5 to 15 

 cm. long; stems erect or ascending; joints narrowly obovate to oblong-obovate, thick, tubercu- 

 late, repand, bright green, 5 to 12 cm. long; leaves soon deciduous, less than 10 mm. long; glochids 

 yellowish; spines usually on the upper half and margin of the joint, often 2, sometimes i to 6, from 

 an areole, whitish or pinkish, darker at base and apex, twisted, sometimes wanting; flowers bright 

 yellow, 6 to 7 cm. broad ; petals cuneate, truncate or retuse at apex, mucronate ; fruit 2.5 to 3 cm. long. 



y ^ 



>■ 



I 



i 



- i" 



i 



^ L 



1 r 



^ 



?:■ 



■ *" 



1 -' 



r^ 



_ T 





', 



+ . 



*r 



1 r 



■J r. 



L 





^.. 



1 



-1 



^ 



Fig. 163. — Opuntia austrina. X0.5. 



^ L 



#- ^ -^ 



Miami, Florida, 



c'. 



H 



i. 



Distribution: Southern 

 Opuntia youngii C. Z. ^ 



f ^ 



'■ ""+ . i 



-^ 



I I 



X- 



X- 



% 



specimen 



V I 



Opuntia spinalha Rafinesque (Atl. J 



I 



147. 



from 



some 



but it is very unlikely that any 



plants of the region inhabited by austrina were known to botanists as early as 1832. 



. C_ 



H 



■^ 





^ * ' ^ 



*' 



Small 



1901 



J ■ 



122. 



J 



■- 



Opuntia fusiformis Engclmann and Bigelow, Proc. Amer. Acad 3: 297 

 Opuntia rafinesquei fusiformis Engelmann. Pac. R. Rep. 4: 43. 1856 

 Opuntia mesacantha macrorhiza Coulter, Contr. U. S Nat Herb 3- 4^0 

 Opuntia xanthoglochia Griffiths, Rep. Mo. Bot. Card. 21: 166 

 Opuntia roseana Mackensen, Bull. Torr. Club 38: 142 191 1 



1850. 



1856. 



1896. 



'M 



.1 



+ 



^ ^ 



I9IO. 



Plant low, usually nearly prostrate, forming a clump i meter in diameter, from a cluster of 



r-lllcp rnnt<5 thpci^ criw*^firMCko «- f^ -, ^ «*« :« j: a_*, • • . ^ . , 1 - — 



green 



5 to 16 cm. long, about i cm. thick; leaves subulate, 4 to 10 mm. long; areoles rather large, the lower 

 ones and sometimes all of them spineless ; glochids numerous, yellow or brown ; spines, when present, 

 I to 4, unequal, yellow to brown, the longest 2.5 cm. long; flower yellow, with a reddish or purplish 



nr^htn^L « ."""i-Kr ' ^'"'^ narrowly obovoid, 3.5 to 5 cm. long, purple or red, with a depressed 

 umbilicus, not edible; seeds 5 mm. in diameter, with broad margins. ' 



Type locality: Rocky places on the Upper Guadalupe, Texas. 



Distribution: Missouri 



Opuntia seguina C. Z. Nelson (Galesburg Register, July 



1915)) published in a news- 



paper, and said to have come from San Antonio, Texas, seems to be one of the Tortispinae 



u. . ^ 



.'■' A 



-T 7 



"^ 



^^\ 



- * 



> ^ 



■> '1 



'rt 



■^^:. 



J ^ -^ 





^ -"^ 



a- 



.f^^^ 



-^ "- 



►_-; ^ 



- ^ 



V 



. ^ 



^^ 



^ ^ 



-> *^i 



T^; 



.- ^ - 



- ^ 



■J' - 



A^ 







.=^ 



J V 



+■- 



w 



r 



1 _ 



'".. ' 



.. .] 



/^ - 



*4 



-V ' 



TO 



^ ^^-. 



'I.. 



. : f 



'• ,:;-.•* 







>* 



A 





