128 MISSOURI BOTANICAL GARDEN. 



e. Rosette leaves whitish, young rosette otherwise very much as in 0. 

 oblonga; flowers pale yellow; capsules small with few seeds. 



0. albida. 

 Rosette leaves nearest those of 0. Lamarckiana, but narrower, usually 

 shorter and less crinkled, usually but not always with midribs 

 rather conspicuously red on the upper siu-face; stem leaves also 

 frequently with red midribs. 

 Rosette leaves with petioles usually red above but always green be- 

 neath. Sepals usually with red stripes of varying width, but 

 hypanthium and median ridge of sepals always green. 



O. rubrinervis. 

 Rosette leaves with petioles more or less red above but conspicuously 

 red on the lower surface. Calyx deep red throughout, includ- 

 ing median ridge of sepals and the whole hypanthium. 



0. ruhricalyx. 

 j . Rosette leaves more narrowly lanceolate than in 0. Lamarckiana, of 

 normal length, of uniform width for the greater part of their 

 length, usually smooth and free from crinkling; stem leaves 

 smooth, standing out rather straight from the stem, narrow and 

 more or less furrow-shaped ; capsules of normal size and shape. 



0. laevifolia. 



Leaves small, with broad midrib; capsules short and thick, of half 



normal size or less, smooth. The bud-bearing portion of stalk 



above the flowers is longer than in other forms. 0. scintillans. 



Oenothera biennis Linnaeus. 



Oenothera, foliis lanceolatis dentatis caule hispido. Miller, Figures 

 of the most beautiful, useful and uncommon plants described in 

 the Gardeners' Dictionary, etc. 2. pi. 189. f. 1. Plate dated 1757. 



Oenothera biennis Linn. Sturm's Deutschlands Flora. 8. pi. 35. Niirn- 

 berg. 1812.— Ettingshausen und Pokorny, Physiotypia plantarum 

 austriacarura. 10. pi. 926. Prag. 1873.— Millspaugh, Medicinal 

 plants. 1. pi. 60. Philadelphia. 1892. 



Onagra {Oenothera) biennis (L.) Scop. MacDougal, Mutants and hybrids 

 of the Oenotheras. (Carnegie Pub. 2^: d. pi. 3-6). 1905. 



The rosettes are various in the different races. Flowers 

 small when open, about 3 cm. in diameter; style short, so 

 that the anthers surround the stigma lobes, and self pollina- 

 tion of the flower invariably takes place before the bud 

 opens, the ruptured anthers being in direct contact with 

 the stigma lobes; buds small and rather pointed, squarish, 

 usually greenish, or with more or less red on the sepals. 



This "species" ranges throughout North America and un- 

 doubtedly contains a large number of geographic races, most 



