528 Davis: LAMARCK’S EVENING PRIMROSE 
2. INFLORESCENCE. The bracts of the inflorescence are not 
broad at the base and sessile as in the Lamarckiana of De Vries. 
They are narrow-elliptical and short-petioled. 
3. Bups. The size and form of the buds present perhaps the 
most important characters on the sheet. They are short and 
stout, and these characters alone make it impossible that the 
plant could have been O. grandiflora Solander. (Compare PLATE 38 
with PLATE 37.) Forms of O. biennis frequently show these 
peculiarities. The sepals have a greater pubescence than those of 
grandiflora. 
4. FLowers. The flowers are medium-sized, petals probably 
between 2 and 2.5 cm. long. They are not large enough for 
grandiflora or for the large-flowered forms of De Vries’s Lamarck- 
jana. The stigma (s, PLATE 38) appears to be at about the level 
of the anthers, the style not extending well beyond as in the types 
mentioned above. The flowers, in size and in the relation of the 
stigma to the anthers, agree with forms of diennis. 
5. CAPSULES. The capsules appear to be of the biennis type, 
which is similar to that of De Vries’s Lamarckiana. 
In conclusion, the forms of the leaves and bracts distinguish 
this plant of Abbé Pourret from the Lamarckiana of De Vries’s 
cultures. The size and form of the buds, the size of the flowers, 
and the position of the stigma distinguish it from O. grandiflora 
Solander as well as from the larger-flowered forms of De Vries’s 
Lamarckiana. All of the characters described above are repre 
sented in the assemblage of forms included under the name Oeno- 
thera biennis. Since we know nothing of the rosette, general habit, 
and lower foliage of this plant, it is quite impossible to follow its 
determination further. 
SHEET 3. SPECIMENS REFERRED BY DE VRIES TO Oenothera 
grandiflora 
The specimens on this sheet (PLATE 39) are SO imperfect and 
their form so abnormal that a satisfactory determination of their 
identity is probably impossible. De Vries (1901, footnote to P: 
316) considered them to be Oecnothera grandiflora Aiton =“ 
grandiflora Solander (O. suaveolens Desfontaines). 
