STANDLEY TREES AND SHRUBS OF MEXICO. 885 



67. Opuntia wilcoxii Britt. & Rose, Cactaceae 1: 172. 1919-. 

 Sonora and Sinaloa ; type from Fuerte, Sinaloa. 



Tall, bushy, 1 to 2 meters high, very much branched ; joints oblong, thinnish, 

 20 cm. long, dark green, more or less purplish about the large areoles, finely 

 puberulent; glochids numerous, long, yellow; spines 1 to 3, one very long (5 

 to 6 cm.), porrect, white or somewhat yellowish; flowers 6 cm. long, yellow; 

 ovary bearing a few large areoles, these filled with brown wool and yellow 

 glochids ; fruit pubescent, 4 cm. long. 



68. Opuntia tomentosa Salm-Dyck, Obs. Bot. 3: S. 1S22. 

 Cactus tomentosus Link, Enum. Hort. Berol. 2: 24. 1S22. 

 Opuntia oblongata Wendl. ; Pfeiff. Enum. Cact. 161. 1S37. 

 Opuntia icterica Grifiiths, Monatsschr. Kakteenk. 23: 138. 1913. 

 Central Mexico ; escaped from cultivation in Australia. 



Becoming 3 to 6 meters high or more, with a broad top and a smooth trunk 

 10 to 30 cm. in diameter ; joints oblong to narrowly obovate, 10 to 20 cm. long, 

 velvety-pubescent, somewhat tuberculate when young ; glochids j'ellow ; spines 

 usually wanting but sometimes 1 or more; flowers orange, 4 to 5 cm. long; 

 fruit ovoid, red, sweetish ; seeds 4 mm. broad. 



69. Opuntia guilanchi Grifiiths, Rep. Mo. Bot. Gard. 19: 265. 1908. 

 Zacatecas. 



Becoming 1.5 to 2 meters high, often with a distinct trunk 1.5 to 2.5 cm. 

 in diameter; joints broadly obovate, 14 to 16 cm. wide, 20 to 24 cm. long, 

 minutely pubescent; spines at first white, slightly flattened, the longest 2 cm. 

 long; glochids light yellow; fruit subglobose, 4 cm. in diameter, pubescent, 

 variously colored, aromatic. " Nopal guilanchi." 



70. Opuntia leucotricha DC. Mem. Mus. Hist. Nat. 17: 119. 1828. 

 Opuntia fiilvispina Salm-Dyck; PfeifE. Enum. Cact. 164. 1837. 

 Central Mexico. 



Often 3 to 5 meters high, with a large top ; trunk as well as the older joints 

 covered with long white bristles ; joints oblong to orbicular, 1 to 2 cm. long, 

 pubescent; areoles closely set, the upper part filled with yellow glochids, the 

 lower part at first with only 1 to 3 weak white spines; flowers (including 

 ovary) 4 to 5 cm. long; petals yellow, broad; ovary with numerous areoles, the 

 upper ones bearing long bristly glochids (1 cm. long) ; fruit variable, 4 to 6 cm. 

 long, white or red, the rind not easily coming off from the pulp, aromatic, edible. 

 "Nopal duraznillo " (Durango) ; "tuna duraznillo " (Zacatecas); " duraz- 

 nillo," " duraznillo bianco," " duraznillo Colorado." 



The following are probably synonymous with this species : Opuntia leucosticta 

 Wendl. (Pfeife. Enum. Cact. 167. 1837) ; O. leucacantha Link & Otto (Salm- 

 Dyck, Hort. Dyck. 362. 1834). 



71. Opuntia orbiculata Salm-Dyck; Pfeiff. Enum. Cact. 156. 1837. 

 Opuntia crinifera Salm-Dyck ; Pfeiff. Enum. Cact. 157. 1837. 

 Opuntia lanigera Salm-Dyck, Cact. Hort. Dyck. 1849. 65. 1850. 

 Northern Mexico. 



Plants without a very definite trunk, about 1 meter high, often broader than 

 high; joints green or bluish green, orbicular to obovate, sometimes spatulate, 

 about 15 cm. long ; areoles small, in seedlings and young plants producing long 

 white hairs or long-persistent wool ; spines acicular, several, yellow ; flowers 

 yellow. 



79688—24 i 



