70 Darwin- Wallace Celebration. 



connoisseurs. In fact the form found in this district is not popular 

 in cultivation. 



Still later 0. crispum was found in another district, on the Eastern 

 Cordillera, about 100 miles north of Pacho, known as the Velez 

 district, which is separated from the Pacho district by an intervening 

 area in which the altitude and climate are totally unsuitable for 

 0. crispum. In this Yelez district two additional species occur in 

 company with 0. crispum, namely, 0. Hunnewellianum, abundantly, 

 and 0. triumphans, in a somewhat limited area, while 0. luteo- 

 purpureum is believed to be absent from the greater part of the 

 district. Here we get two additional natural hybrids, namely : 



0. crisptim X 0. Hunnewellianum = 0. Adriatic?. 



0. crispum X 0. triumphans = 0. harvengtense (loochristiense). 



The first-named is common and remarkably variable, and its 

 presence in an importation of 0. crispum affords an infallible clue 

 to the locality. Both have been raised artificially, so that there is 

 not a shadow of doubt about their origin. Here also 0. crispum is 

 extremely variable, and there is a type of variation which is not 

 found in the Pacho district, namely that approaching the natural 

 hybrid 0. Adriance, the cause of which is now apparent. The 

 secondary hybrid from 0. crispum and 0. Adrians has been raised 

 rtificially, and is again fairly intermediate between them, while it 

 can also be matched among wild plants which have been referred to 

 0. crispum. This secondary hybrid is known under the name of 

 Odontoglossum Fascinator, and the fact that it exists as a wild 

 plant is significant. 0. crispum has also been intercrossed with its 

 hybrid 0. Andersonicnmm, resulting in 0. Steivartianum, and with 

 0. Coradinei, yielding 0. Crispodinei, both secondary hybrids which 

 can be fairly matched among wild plants. 



These facts afford a clue to the origin of the so-called " blotched 

 crispums." It is seen that it is where 0. crispum grows in company 

 with other normally blotched species that these so-called " blotched 

 crispums " occur, and that they are absent from localities where the 

 species grows by itself ; also that similarly blotched forms can be 

 raised artificially by crossing 0. crispum with its own hybrids, and 

 the inference naturally follows that the said forms are not simple 

 varieties of 0. crispum, but natural hybrids of mixed parentage, 

 which owe their origin to insect agency, where the parent species 



