128 



THE CACTACEAH. 



eastern Kansas, but the plants found there are not Hke those found in Illinois and Indiana, 

 having more spines and a glaucous bloom, and are tuberous-rooted, and these are referred 

 by us to 0. macrorhiza. The published western varieties of 0. humifusa are specifically 

 distinct; we have referred them to 0. tortispina. 



Some of the joints of this plant elongate under shade conditions, reaching at least 2.5 

 dm. in length and not more than 5 cm. in width. 



Opuntia arkansana (Hirscht, Monatsschr. Kakteenk. 8: 115. 1898) has not been 

 formally described. The name should doubtless be referred here. 



Opuntia prostrata Monville and Lemaire (Forster, Handb. Cact. 478. 1846) was given 

 only as a synonym of O. intermedia, while 0. intermedia prostrata Salm-Dyck (Cact. Hort. 

 Dyck 1849. 69. 1850) was based on O. prostrata. 



O. rafinesquei parva ll3,age and Schmidt (Verzeichnis Blumenzwiebeln 1915: 29. 1915) 

 is a new name for O. mesacantha parva Coulter. 



Under Opuntia vulgaris Michaele Gandoger in his Flora Europea (9: 145. 1886) has 

 proposed the following new binomials: 0. recedens, 0. morisii, O. cycloidea, O. inaequalis, 

 O. ligustica, and O. mediterranea. The following varieties cited under O. humifusa are in 

 the trade: cymochila, greenei, macrorhiza, oplocarpa and stenochila (Stand. Cycl. Hort. 

 Bailey 4: 2363. 1916.) 



Fig. 160. — Opuntia opuntia in its natural surroundings on Staten Island, New York. 



Loudon, Encycl 



Mag 



Hist. 2: pi. 138 [A]; DeTussac, FL Antill. 2:* pi. 30, the last two as Cactus opuntia nana. 

 Dept. Agr. N. S. W. Misc. Publ. 253: pi. [i], f. 2; Engler and Prantl, Pflanzenfam. 

 3^^: f 57, G; Forster, Handb. Cact. ed. 2. f. 12; Pac. R. Rep. 4: pl.io, f. i, 2; 4: pi. 23, f. 13; 

 Schumann, Gesamtb. Kakteen Nachtr. f. i, all as Opuntia vulgaris. Standard CvcL 



Hort 



Opuntia humif\ 



Amer. Entom. Bot. 2: f. 160: Amer 



Mag. 115: pi. 7041; Diet. Gard. Nicholson 2: f. 7^6: Fl. Serr 



Lemaire, Cact. f. 9; Meehan's Monthly 



Handb. Cact. ed. 2. f. 2; Gard. Mag 



218; 



ifi 



Riimpler, Sukkulenten f. 125; W. Watson, Cact. Cult. f. 84, all as Opuntia 

 Pac. R. Rep. 4: pi. n, f. i, as Opuntia rafinesquei minor: Forster. Handb. 



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