APPENDIX. 



261 



On page 134, vol. i, under Opuntia soehrensii, add the synonyms: Cactus ayrampo 

 Azara, Voy. 2: 526. 1809; Opuntia haenquiana Herrera, Rev. Univ. Cuzco 8: 60. 1919. 

 Also insert: Azara's original description is interesting and a translation of it is given: 

 "A species of tunilla (cactus) which is found in the temperate gorges near the Cordillera 

 produces the seed in question. The plant is found in arid and sterile soil where ordinarily this 

 family of plants grows and thrives by creeping on the ground in such a way as to stifle all the others. 

 From the seed confined within the round and spiny fruit is derived a color of a clear violet, brilliant 

 and extremely agreeable to the eye but verj^ superficial and very light, although it acquires a little 

 stability and durability by the means of alum and some other chemicals." 



On page 135, vol. i, insert: 



129a. Opuntia macbridei sp. nov. 



A low bush, 6 dm. high, forming broad impenetrable thickets on gravelly river flats; joints 

 obovate, 6 to 8 cm. broad, 8 to 15 cm. long, glabrous, at first light green, in age dark green; leaves 

 minute, i to 2 mm. long, caducous; areoles on young joints hemispheric, brown-felted and with 



Fig. 238. — Opuntia macbridei. 



brown glochids, on old joints 2 to 3 cm. apart; spines 2 to 4, in age gray to horn-colored, with 

 yellowish tips, very unequal, the longest up to 5 cm. long, stout-subulate; flowers very small, orange 

 to orange-red; petals only 4 to 5 mm. long; ovary tuberculate, bearing many brown-felted tubercles 

 but without spines, deeply umbilicate; fruit deeply umbilicate, red to purple. 



Collected by Macbride and Featherstone at Huanuco, Peru, altitude 2,300 meters, 

 August 28 to September 3, 1922 (No. 2365, type), and April 8, 1923 (No. 3250). 



Mr. Macbride states that the seeds are brown. All the fruits we have seen were 

 sterile; these sterile fruits on falling to the ground take root and form new plants. 



This interesting plant, which proves to be undescribed, we have named for Mr. J. 

 Francis Macbride, who led the Botanical Expedition of 1922 to South America, sent out 

 by the Field Museum of Natural History, under the Captain Marshall Field fund. 



Figure 238 is from a photograph showing the habit of this plant. 



On page 135, vol. i, under Opuntia penicilligera, insert: Mr. W. B. Alexander sends 

 us the following account of this plant: 



"This plant was met with close to the coast at Bahia Blanca, and near the foot of the Andes at 

 Tunuyan. As remarked by Spegazzini, this species is very distinct from any other found in Argentina 

 and there seems no reason for thinking that it may belong to the Series Sulphiireae in which it is 



