SOME SEGREGATES OF OENOTHERA. 127 



the buds; sepal tips awl-shaped, stouter than in 0. grandiflora. 

 Red glands always present on stems. 



O. Lamarckiana and its segregates. 



KEY TO THE LAMARCKIANA FORMS. 



Rosette leaves, and to a lesser extent in some cases, stem leaves crinkled, .a 



Rosette and stem leaves nearly or quite free from crinkling b 



a. Rosette leaves and stem leaves sessile or nearly so. O. nanella. 



Rosette leaves and lower stem leaves with petioles c 



c. Petioles of rosette leaves not margined. 0. oblonga. 



Petioles of rosette leaves margined d 



d. Leaves whitish e 



Leaves green without whitish cast f 



f. Flowers larger than in O. Lamarckiana; bud cone about 9 to 10 ram. in 

 diameter at the base ; hypanthium stouter, about 4 mm. in diameter. 



0. gigas. 



Flowers somewhat smaller; bud cone about 7 to 8 mm. in diameter at 



the base; hypanthium more slender, about 3 mm. in diameter. . . .g 



g. Rosette leaves oblong or fairly broadly lanceolate, crinkled, 



pointed h 



Rosette leaves very broad, oblong, with very obtuse tips, 



lighter green and much crinkled i 



Rosette leaves similar to those of O. Lamarckiana (h), but 

 rather broader and with very obtuse, rounded tips. The 

 bracts are also broader than in 0. Lamarckiana, and the 

 sepal tips very short. 0. brevistylis. 



h. Blooming at the same time in the season as other forms (in 

 my cultures beginning about the end of July). Ovaries 

 of ordinary shape, 8 to 10 mm. in length. — See short 

 description. O. Lamarckiana. 



Blooming later than 0. Lamarckiana (beginning in my 

 cultures of this year about August 15th). Leaves like 

 those of O. Lamarckiana, but closely clothing the stem; 

 branches few; capsules long and thin. O. leptocarpa. 



i . Stems often weak and more or less decumbent ; buds 

 greenish, rounded, not usually squarish, thick; an- 

 thers dry and sterile ; petals much crumpled in the 

 bud, making it usually one-sided. 0. lata. 



Taller than O. lata; bud cones less thick than in 

 O. lata, more squarish ; leaves smaller and less roimded 

 at the point; anthers producing pollen. 0. semilata. 



b. Petals emarginate or sometimes truncate J 



Petals elliptical, capsules long and thin. 



Stem low, weak; leaves very small, lanceolate, long and narrow, 



often ten times longer than broad. O. elliptica. 



Strongly branched, less than one metre high; leaves very small, 



neariy linear. O. sublinearis. 



