174 



THE CACTACEAE. 



Plate xxxiii, figure i, represents a fruiting joint of a plant raised from seeds received 

 by the United States Department of Agriculture. Figure 212 is from a photograph of a 

 plant near St. Georges, Bermuda, taken by Stewardson Brown in 1912. 



191. Opuntia tomentella Berger, Monatsschr. Kakteenk. 22: 147. 1912. 



Bushy; joints obovate to oblong, 20 to 30 cm. long, 9 to 15 cm. broad, light green, somewhat 

 shining, finely puberulent; areoles about 3 cm. apart, small; spines i or 2, acicular, white, short 

 (7 to ID mm. long), porrect, sometimes wanting; glochids few; flowers numerous, 5 to 6 cm. long; 

 petals obovate, reddish yellow; filaments yehowish green; style rose-colored; stigma-lobes white; 

 ovary tomentose, armed with numerous black glochids ; fruit oblong, red, sour. 



Type locality: In Guatemala. 



Distribution: Guatemala. 



This species was distributed by the late F. Hichlam, who sent 

 plants both to Washington and to La Mortola, those sent to La 

 Mortola being used by Mr. Berger for his description. The species 

 is perhaps near the common Mexican species 0. tomcntosa, but 

 does not grow so tall, and the tomentum is not so dense nor so 

 soft. 



Figure 213 represents a joint of a plant collected in Guatemala 

 by F. Eichlam in 1909. 



192. Opuntia guilanchi Griffiths, Rep. Mo. Bot. Gard. 19: 265. 1908. 



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 flat- 

 tened, the longest 2 cm. long; glochids light yellow; fruit subglobose, 4 

 cm. in diameter, pubescent, variously colored, aromatic. 



Type locality: Near the city of Zacatecas, Mexico. 

 Distribution: Zacatecas, Mexico. 



Series 18. LEUCOTRICHAE. 



This series is restricted to a single species. Schumann grouped as 

 Chaclophorac, 0. kucotricha with 0. ursina, the latter a species with simi- 

 lar long bristles on the stem but otherwise very different, it being dry- 

 fruited. Opuntia leucotricha is characterized by its long, weak, hair- 

 like or bristle-like spines on many of the joints, especially the stem and F^°- 2i3.-Opuntia tomentella. 

 very old joints. The fruit of this plant is very different from that of °"*' 



related series in that the pulp is fragrant and does not come free from the rind when mature. 



193. Opuntia leucotricha De Candolle, Mem. Mus. Hist. Nat. Paris 17: 119. 1828. 



Opuntia fulvispina Salm-Dyck in Pfeiffer, Enum. Cact. 164. 1837. 



Opuntia leucotricha fulvispina Weber in Schumann, Gesamtb. Kakteen Nachtr. 157. 1903. 



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, i to 2 cm. long, pubescent; areoles closety set, the upper 

 part filled with yellow glochids, the lower part at first with only i 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 (i cm. long); style red; stigma-lobes green; fruit variable, 4 to 6 cm. 

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



Type locality: In Mexico. 



Distribution: Central Mexico. 



Opuntia erythrocentron Lemaire (Forster, Handb. Cact. 492. 1846) was given as a 

 synonym of 0. fulvispina. 



Opuntia leucosticta Wendland (Pfeiffer, Enum. Cact. 167, 1837) probably belongs here. 



Opuntia leucacantha Link and Otto (Salm-Dyck, Hort. Dyck. 362. 1834), published 

 first in 1834 — although the name occurs in Hterature as early as 1830 (Verh. Ver. Beford. 



