Chap. III. STIMULUS LUTEUS. 63 



CHAPTER III. 



S(JK0PHTJLARIACE2E, GESNER1A0E.E, LABIAT.E, ETC. 



Mimulus luteus; height, vigour, and fertility of the crossed and self- 

 fertilised plants of the first four generations Appearance of a 

 new, tall, and highly self-fertile variety Offspring from a cross 

 between self-fertilised plants Effects of a cross with a fresh stock 

 Effects of crossing flowers on the same plant Summary on 

 Mimulus luteus Digitalis purpurea, superiority of the crossed 

 plants Effects of crossing flowers on the same plant Calceolaria 

 Linaria vulgaris Verbascum thapsus Vandellia nummulari- 

 folia Cleistogamic flowers Gesneria pendulina Salvia coccinea 

 Origanum vulgare, great increase of the crossed plants by stolons 

 Thunbergia alata. 



In the family of the Scrophulariaceae I experimented 

 on species in the six following genera: Mimulus, 

 Digitalis, Calceolaria, Linaria, Verbascum, and Van- 

 dellia. 



II. SCBOPHULABIACEiE. Mimulus luteus. 



The plants which I raised from purchased seed varied greatly 

 in the colour of their flowers, so that hardly two individuals 

 were quite alike ; the corolla being of all shades of yellow, 

 with the most diversified blotches of purple, crimson, orange, 

 and coppery brown. But these plants differed in no other 

 respect.* The flowers are evidently well adapted for fertilisa- 

 tion by the agency of insects ; and in the case of a closely allied 

 species, M. roseus, I have watched bees entering the flowers, thus 

 getting their backs well dusted with pollen; and when they 

 entered another flower the pollen was licked off their backs by 



* I sent several specimens with The flowers with much red have 



variously coloured flowers to Kew, been named by horticulturists aa 



and Dr. Hooker informs me that var. Youngiana, 

 they all consisted of M lideus. 



