48 



THE CACTACEAE. 



The great variation in the length of the spines and in the character of the spine sheaths 

 has led to the description of several varieties. These all seem to us to merge into the one 

 species, as above indicated. It sometimes hybridizes with 0. imbricata. See C. B. 

 Allaire's plant from San Antonio, New Mexico. 



The following names, Opuntia leptocaulis laetevircns Salm-Dyck (Hort. Dyck. 184. 

 1834), 0. gracilis subpatens Salm-Dyck (Cact. Hort. Dyck. 1849. 73. 1850), and O. lepto- 

 caulis major Tourney (Cycl, Amer. Hort. Bailey 3 : 1 152. 1901) are printed but not described. 



Illustrations: Bull. Torr. Club 32 : pi. 10, f. 9; Rep. Mo. Bot. Gard. 19 : pi. 21, in part; 

 SafTord, Ann. Rep. Smiths. Inst. 1908: f. 12; Emory, Mil. Reconn. app. 2. f. 12; Pac. R. 

 Rep. 4 : pi. 20, f. I ; pi. 24, f. 13 to 15, all as Opuntia vaginata. Cact. Journ. i : 154, as Opuntia 



v 



q - n 



J-* 



"_*■ 



A 



Fig. 56. — Opuntia leptocaulis in the foreground. 



/ 



I^iG- 57 — Opuntia leptocau- Fig. 58. — Opuntia ca 



lis. X0.4. ribaca. X0.66. 



from 



mtia frutcscens brcvisp 

 Jrutcscens longispina. 





from 



same 



from a photograph taken bv Dr. MacDou 



near Tucson Arizona, in 1913; figure 57 represents a branch with young leafy shoots, of a 



specimen collected by Dr. Rose in 191.^ at Lared 



4. Opuntia tesajo Engelmann 



1896. 



Bushy, 3 dm broad and high; joints slender, indistinctly tuberculate 2 to -^ cm lone- areoles 

 5 o 6 mm. apart; leaves awl-shaped, 2 to 4 mm. long, often red; spines at first ° ^smSi dafk brown 



stigma-lobes 5, yellowish. ' ^^ ^^ ''"'• ^°"^' ^"^^"^ing the ovary; style whitish; 



Type locality: In Lower Cahfornia. 



_^.L 



Lower 



The type of this Httle-known species should 



Lou 



La 



The 



m of the Missouri 



Purpus, who has collected 



plant in Lower California, 

 stems have the peculiar m 



Dr. C. A. 

 ited to O. 

 ies. This 



. r'' 



