ON SOME HYBRIDISATION EXPERIMENTS 

 WITH VARIETIES OF COLLINSIA SPECIES 



BY HANS RASMUS ON 



HILLESHÖG, LAXDSKRONA 



IN order to procure material for hybridisation experiments se- 

 veral sorts of seed from »Trädgardsföreningen» in Gothenburg 

 were bought in 1917 and in the summer a great number of plants 

 of many different species were raised. Among these there were 

 several species of the genus Collinsia, but only two of them showed 

 variation, and these were used for hybridisation experiments. These 

 were the species bicolor and tinctoria. Of the former I became two 

 varieties which differed in the flower colour; the latter species showed 

 variation in several characters. A cross between the two species was 

 tried but no seed was obtained. The pollinations, however, were 

 very few and therefore this result is not of great significance. 



C BICOLOR. 



The flowers of the normal form of this species have a lilac-coloured 

 under lip and an upper lip almost white. The stem of this form is 

 always more or less red-coloured, that is, it always contains antho- 

 cyan. Besides this normal form I got a variety with green stems 

 and with altogether white flowers, or sometimes slightly tinged with lilac, 

 C. bicolor alba. Apparently it breeds true as all the plants raised 

 from the seeds bought were of this form. Also one of them selfed 

 gave a progeny of 27 plants, all with white flowers. Between these 

 two varieties some crosses were made and the results are given below. 



Hybridisation I. 



501 b, lilac, X 502 b, white. 

 Fl! 42 plants, all with lilac flowers. 

 F.: I— 1: lilac 1, white 1, 

 1—8: » 5(4), » 2, 

 . 1—30: » 5(4), » 2. 



