In addition to the Colombian specimens mentioned, 
the following Peruvian collections should be cited: 
Dept. Ayacucho: Ccarrapa, between Huanta and Rio Apurimac, 
at 1000 meters altitude, epiphyte on wooded hillside, May 5, 6, 17, 
1929, FE. P. Killip & A. C. Smith 22484; Aina, between Huanta and 
Rio Apurimac, at 750-1000 meters altitude, epiphyte in dense forest, 
May 7, 17, 1929, Killip & Smith 22773, 22776.—Dept. Junin: Hua- 
capistana, at about 1800 meters altitude, epiphyte in densely forested 
valley, June 6, 1929, Killip & Smith 24295. 
Stelis purpurea (Ruiz & Pav.) Willdenow Sp. PI. 
4 (1805) 140. 
Humboldtia purpurea Ruiz & Pavon Syst. Veg. (1798) 
235. 
Stelis truncata Lindley in Hooker Comp. Bot. Mag. 
2 (1836) 853; Fol. Orch. Stelis (1858) 15, no. 115. 
Stelis Huancabambae Krinzlin in Engler Bot. Jahrb. 
54, Beibl. 117 (1916) 20. 
Stelis cordibractea Schlechter in Fedde Repert. Bei- 
hefte 8 (1921) 51; Schlechter ex Mansfeld in Fedde 
Repert. Beihefte 57 (1929) t. 80, nr. 310. 
Stelis phaeantha Schlechter in Fedde Repert. Beihefte 
9 (1921) 68; Schlechter ex Mansfeld in Fedde Repert. 
Beihefte 57 (1929) t. 111, nr. 435. 
Recently there came to hand an apparently authentic 
specimen of Humboldtia purpurea (=Stelis purpurea) 
from the Ruiz & Pavon collection preserved in Madrid. 
While this specimen has very imperfect inflorescences, 
it is otherwise in a serviceable condition and has good 
flowers. 
Stelis truncata, exemplified by a photograph of the 
type collection, differs from S. purpurea only in having 
proliferous or branched stems and usually (but not al- 
ways) smaller leaves. However, in the specimen of Stelis 
purpurea above mentioned, there are in the axil of one 
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