520 Davis: LAMARCK’S EVENING PRIMROSE 
my own collections and at the New York Botanical Garden, was 
unmistakable. Miss Alice Eastwood, who kindly looked up 
various matters for me during her recent trip abroad, examined 
last winter in Paris this sheet which stands for the type of Oenothera 
Lamarckiana Seringe and reported to me her belief that it is identical 
with O. grandiflora Solander. As a result of this report I obtained 
through the courtesy of M. Francois Gagnepain negatives of this 
and other herbarium sheets at the Muséum d’Histoire, Naturelle 
bearing upon the problem. M. Gagnepain further has most 
kindly answered a number of specific enquiries concerning the 
history of the specimens and certain characters of the plants not 
shown in the photographs. The following descriptions of these 
herbarium sheets are then in part from the photographs here 
published and in part from the notes of Miss Eastwood and M. 
Gagnepain, to whom I am greatly indebted. 
The three sheets, to be described, were examined by Professor 
De Vries, who has given his interpretation (1901) in footnotes to 
Die Mutationstheorie, Vol. I, pp. 316,317. De Vries believed that 
the first two sheets agreed with his cultures of Lamarckiana. The 
specimens on the third sheet he referred to Oenothera grandiflora 
Aiton (O. suaveolens Desfontaines) = O. grandiflora Solander. 
The conclusions of the present paper are (1) that the first sheet 
(PLATE 37), the type of Oenothera Lamarckiana Seringe, shows 4 
remarkably well preserved and characteristic specimen of Oenothera 
grandiflora Solander, (2) that the specimen on the second sheet 
(PLATE 38) is neither O. grandiflora Solander nor “0. Lamarckiana De 
Vries” but a plant that is close to certain forms of O. bienmts, and 
(3) that the two plants on the third sheet (PLATE 39): obviously 
stunted in growth, are so imperfect that an opinion of their identity 
can hardly be more thana guess. Our interest in this herbarium 
material centers upon the first two sheets. 
OF 
SHEET 1. LAMARCK’S PLANT, WHICH STANDS AS THE TYPE 
Oenothera Lamarckiana Seringe 
This specimen (PLATE 37) is in the herbarium of Lamare ks 
acquired by the Muséum d'Histoire Naturelle in 1886. ape 
sheet bears in the handwriting of Lamarck: “Oenothera - iis 
[grandiflora] . . . nova spec. flores magni lutei, odore grato, cau 
