IZ 
o 
5 
a} 
purpureum, as round O. crispum and some others, the question always remains 
whether these forms should be considered as representing varieties or natural 
hybrids between the typical species and some allied one. O. Thompsonianum 
appears to be the result of a cross between O. luteo-purpureum and O. Coradinet 
or some allied form. We do not attempt the task of deciding a question of this 
kind, and we think the better plan, is to give to this unique plant a special name, 
without callig it either a hybrid or a variety. 
Odontoglossum luteo-purpureum, to which it is most allied was, as iS well- 
known, discovered by M. LINDEN, in 1842, in the forests of Quindiu, on the 
central Cordillera of New Granada, and was described by LINDLEY in the 
Orchidaceae Lindenianae from dried specimens collected by the former. Afterwards 
it was also discovered by Weir in the Odontoglossum crispunt district. It is therefore 
evident that it may have produced numerous intermediate forms by crossing with 
this species, also with O. Lindleyanum, O. odoratum and O. Coradinet. 
Dea Le 
1) 
Ue 
CU 
