No. 532] GENETICAL STUDIES ON OENOTHERA 207 



4. Buds.— From 9-10 cm. long, the cone scarcely angled 

 (Fig. 4). Sepals marked with reddish brown blotches, 

 sometimes dull and faint ; their tips attenuate. 



5. Floivers.— Large (Figs. 5 and 8). Petals about 3.3 

 cm. long. Stigma lobes generally 2-5 mm. above the 

 tips of the anthers. 



6. Capsules.— Tapering rather sharply from the large 

 base, 2.5-3 cm. long. 



7. Seeds.— Dark brown. Those developed in the 

 ovary of grandiflora, after pollination by biennis, have the 

 same color as the female parent. 



The above description is so worded as to emphasize the 

 characters of the grandiflora strains A, B, and D in con- 

 trast to the biennis strains A and B. It should be com- 

 pared with the description of the latter forms to under- 

 stand clearly the conditions that appear in the hybrids, 

 which will now be described. 



