354 BOTANICAL GAZETTE [may 



3 cm. long and 3 mm. wide; while those of 0. Lamarckiana may 

 measure 2 . 5 cm. in length and 6 mm. in width, making a ratio of 

 -V" in the one case and f in the other.^^ The description of the 

 fruits as short, as given by Lamarck, evidently points to the second 

 and not to the first case.^^ 



Smnming up the main results of this discussion, we fiind that 

 specimen A of the herbarium of Lamarck closely corresponds 

 to the O. Lamarckiana Ser. of the present time, and has been taken 

 by almost all authors for its protot}^e. The specimen B differs 

 from it in its general aspect, in the words "odore grato" on its 

 label, and in the opinion of Poiret that it belongs to O. grandi- 

 flora Ait., this opinion pointing to long and narrow fruits. Per- 

 sonally, it impressed me as having been brought into the herbarium 

 of Lamarck only later on, and as having been placed in the cover 

 of 0. grandiflora Lam. with a doubt shown by the placing of the 

 name in brackets. 



The best proof for the fact that A and not B is the authentic 

 specimen of O. grandiflora Lam. is perhaps given by the specimen in 

 the herbaritmi of Father Poxjrret, which was given to the Museum 

 d'Histoire Naturelle by Dr. Barbier in 1847.^'' It bears the name 

 Oenothera grandiflora Lam. written in the clear and beautiful hand- 

 writing of the clerk of Pourret. Li the same cover there is another 

 sheet of Pourret's collection, on which the same clerk wrote 

 Oenothera biennis. Unfortunately, Davis, who did not visit the 

 Museimi, has mistaken this one for the one studied by me,^' and 

 has accordingly pubhshed a photograph {pi. 38) and a description 

 of it. It is easily seen that this specimen reaUy comes nearer to 

 our present O. biennis L. than to anything else. 



»" L'Oenothera grandiflora de I'herbier de Lamarck, op. cit. fig. i, b and c. 



« Davis (pp. cit. p. 523) lay^ great stress on the tips of the sepals, but I cannot 

 find a well defined diflEerence between the two species in this character. He calls 

 attention to the word "s6tac6" in Lamarck's description of the sepal tips: "this 

 has been translated by De VsiES (AfMtoiJo»i-r/!eorie, p. 317. 1901) as "dicke." The 

 French, however, is from the late Latin word setaceus, derived from "seta," a stiff 

 hair or bristle. The meaning, therefore, is exactly the opposite of that given by 

 De Vries." If the reader will kindly look up my book at the page quoted by Davis, 

 he will find that I have translated "stoc6" by "fadenformig." 



»4 The Mutation Theory, Engl. ed. 1 1442, note 2. 



« Bull. Torr. Bot. Club op. cit. p. 527. 



