Oncidium Dayanum has been imported together with O. Phalaenopsis 
by Linden. Excellent color drawings exist at Kew among Day’s draw- 
ings, Book 15, page 56, drawn on Febr. 16 and 28, 1871. 
Illustrations: Amer. Orch. Soc. Bull. 27: 729, 1958; ibid. 42: 
1009, 1973; ibid. 44: 580, 1975, as O. Phalaenopsis; Dodson & Gilles- 
pie, The Biology of the Orchids, Frontispiece, 1967 as O. Phalaenopsis. 
Oncidium tripterygium Rchb.f. in Bot. Zeit. 10: 
694, 1852. 
Type: Ecuador, Loja. Coll. Warscewicz s.2./ (W). 
Observation: Dorsal sepal 18 mm. long; lateral sepals connate, 
bifid, 18 mm. long, 6 mm. wide; petals from a cuneate base elliptic- 
lanceolate, acute, 17 mm. long, 8 mm. wide; lip longer than wide, 
33 mm. long, 22 mm. across lateral lobes, 30 mm. across terminal lobe. 
The type material consists of a single flower in a rather poor state 
of preservation. In size it is very close to O. Phalaenopsis, but the 
callus of the lip is very different. It is quadrate to oblong in outline, 
convex, consisting of three parallel ridges of which the two outer ones 
are obscurely lobulate, the third in the center originates from the base 
of the lip between the column-wings and as long as the lateral ones. 
Illustration: Il]. Hortic. 17: t. 8, 1870, as O. Phalaenopsis. 
Oncidium andigenum Linden & Rchb.f. in Gard. 
Chron. 416, 1869; ibid. 539, 1872. 
Syn.: Oneidium cucullatum var. andigenum (Linden 
& Rehb.f.) Hort. in Garden 22: 166, 1882. 
Oneidium cucullatum subvar. andigenum (Linden & 
Rchb.f.) Veitch, Man. Orch. PI. pt. 8:31, 1892. 
Oneidium  olivaceum var. andigenum (Linden & 
Rehb.f.) Sander, Orch. Guide 184, 1901. 
Type: Ecuador, without proper locality. Coll. Wallis 
s.n./ (W). 
Observation: Dorsal sepal 6 mm. long, 2.5 mm. wide; lateral se- 
pals connate, bifid, cymbiform, 7 mm. long, 3 mm. wide; petals elliptic- 
oblong, obtuse, 6mm. long, 2.5 mm. wide; lip pandurate, 7 mm. long, 
4.5 mm. across lateral lobes, 5 mm. across terminal lobe. 
Although references have been made to this species in literature, 
I have seen only one collection in addition to the type to which I can 
satisfactorily refer here. There is a color drawing with details of flow- 
ers of this species in the Kew Herbarium among Day’s drawings, 
Book 18: page 54, drawn on October 19, 1874. The corresponding 
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