526 Davis: LAMARCK’S EVENING PRIMROSE 
O. grandiflora Solander AND LAMARCK’S 
Flowering stems generally with numer- 
ous approximate branches. 
green above, reddish brown below, 
the papillae at the base of long hairs 
colored like the stem. 
O. Lamarckiana FROM THE CULTURES OF 
IES 
Flowering stems sparsely branched or 
not at all. 
The papillae at the base of the long hairs 
colored red so that the green stem 
appears punctate with red dots. 
Leaves of upper foliage lanceolate, 
rarely broad, with distinct petioles. 
Inflorescence more open, with narrow, 
petioled bracts. 
Buds not stout, with much attenuated 
sepal tips. Sepals puberulent, some- 
times sparsely pilose. 
Flowers with a long delicate hypan- 
thium. Petals 3-3.5 cm. long. Stig- 
ma lobes above the tips of the anthers. 
Leaves of upper foliage ovate-lanceolate, 
sessile or almost sessile. 
Inflorescence more close, with sessile 
bracts broad at the base. 
Buds stout, with shorter sepal tips. 
Pubescence of sepals a heavy puber- 
etals in some races 4—-4.5 cm. long, 
in others 2.5-3 cm. long. Stigma 
lobes in the large-flowered types above 
the tips of the anthers, in the smaller- 
flowered forms at about the level of 
of the anther tips. 
There is another sheet in the herbarium of the Muséum d’His- 
toire Naturelle which is without a name but bears in the hand- 
writing of Lamarck: “‘d’Amérique sept. Tige rameuse, haute de 
3.44 pieds.” Both M. Gagnepain and Miss Eastwood report that 
this sheet is similar to that of Lamarck’s plant which we have 
described above and shown on PLATE 37. The history of the sheet 
is apparently not known and I have no evidence that it can sately 
be associated with the specimen upon which Lamarck undoubtedly 
based his description. Nevertheless, this sheet may be closely 
related to or even a duplicate of the specimen that served as the 
type for the descriptions of Lamarck and Seringe. 
In summary it may be said that the specimen, which we must 
_consider the type of Oenothera Lamarckiana Seringe, presents n° 
characters in clear form that are not those of O. grandiflora 
Solander. In not one of the contrasted characters discussed 
above does the specimen agree with the Lamarckiana of De Vries § 
cultures. The only points in which De Vries’s Lamarckiana may 
be said to resemble this specimen are the size of the petals and 
the position of the stigma, which in the large-flowered forms of 
Lamarckiana is above the tips of the anthers; these are characters 
which grandiflora and De Vries’s Lamarckiana have in commot 
