132 MISSOURI BOTANICAL GARDEN. 



/. 46, buds; 1 : 192. pi. 1, colored; 1 : 289. /. 89, rosette leaf, bract 

 and terminal rosette; 1 : 378. /. 114, dry fruits; 2 : 240. jpl. 7, colored; 

 2 : 496. pi. 3, colored. 



For figures of 0. Lamarckiana and its mutants, sec DeVrics, 

 Die Mutationstheoric, 1901 and 1903; Recherches experi- 

 mcntalcs sur 1' origine dcs especes (Rev. gen. de hot. 

 13:5-17). 1901.— MacDougal, Mutation in plants (Am. Nat. 

 37:737-770). 1903. Printed also in Contrib. N. Y. Bot. 

 Garden, no. 48. figs. 8. — MacDougal et al., Mutants and hy- 

 brids of the Oenotheras (Carnegie Pub. no. 24), 1905: and 

 Mutations, variations and relationships of the Oenotheras 

 (Carnegie Pub. no. 81). 1907. 



Flowers large, about 7 cm. in diameter, style long, as in 

 0. grandijlora. Buds pubescent, with numerous long and 

 short hairs, sepals somewhat thicker than in 0. grandijlora, 

 and median ridge more prominent, giving a characteristic 

 squarish appearance to the buds. Sepal tips awl-shaped, 

 stouter than in 0. grandijlora. These numerous characters of 

 the sepals make it possible to distinguish the 0. Lamarckiana 

 and 0. grandijlora buds without any difficulty. Although 

 the differences are all purely quantitative in character, yet 

 their summation gives an entirely different aspect to the 

 bud in the two cases. 



Rosette leaves usually much crinkled, rather broadly 

 lanceolate, pointed, usually without red on midribs; petiole 

 margined for some distance. A rosette is always formed 

 and the rosette stage usually (in cultures) lasts about four 

 months after the planting of the seeds. Stem leaves crinkled. 

 Red glands on stem and ovaries. Sepals usually green, but 

 Bomctimes with reddish stripes. The 0. Lamarckiana forms 

 usually come into bloom later than 0. grandijlora. 



Oenothera rubrinervis DeVrics. 



See under O. Lamarckiana. Die Mutationstheoric. 1 : 162. /. 43, flower- 

 ing shoot; 1 : 199. /. 49, whole plant; 1 : 207. /. 52, rosette leaves; 

 1 : 209. /. 54, rosette leaves; 1 : 231-238. /. 67, 68, 70, whole plant; 

 1 : 320. /. 99, fruits; 2 : 496. pi. 3, colored. 



Rosette leaves narrower, usually shorter and less crinkled 

 .than in 0. Lamarckiana, whitish, and usually but not always 



