G. H. SHULL 91 



group had the bud- and stem-characters of the spotted plants, from 

 which I infer that the original determination of the character of this 

 plant was the correct one, and it is therefore included with the spotted 

 plants in the above reckoning. Only 25 of each group were set into 

 the field to grow to maturity. All the adult plants had the branching 

 habit and long capsules characteristic of 0. rubricalyx and 0. rubrinervis. 

 Eight in the spotted group had slightly broader, darker green, more 

 strongly crinkled leaves than their sibs, in these particulars more 

 closely approaching the characters of 0. Lamarckiana, but their stems 

 and buds did not differ in pigmentation from those of the other 

 plants in the spotted group. One plant in the spotted group had the 

 buds colored as in 0. rubrinervis, but was so heavy in all its parts as 

 to suggest the likelihood that it was a triploid form. Its capsules 

 were notably thicker and shorter than those of its sibs. I have 

 no special record as to the color of the stem of this plant, but 

 as it stood in the red-stemmed group, it would probably have been 

 noticed if different in this respect from the rest of the group. All the 

 rest of the spotted group had brilliant red stems and Lamarckiana-like 

 buds with pink cones and green hypanthia. The unspotted group, with 

 the one exception already mentioned, had greenish stems and the 

 typical ra&n'co^tf-coloration of the buds, i.e., with hypanthia and cones 

 uniformly and intensely red-pigmented, except on the distal portion of 

 the free tips of the sepals, which were free from anthocyan. 



Oenothera rubricalyx x Lamarckiana F^ 

 Pedigree Nos. 11410(1) x 118(10) = 1234. 



Of this pedigree I secured 123 plants which were again divisible 

 into spotted and unspotted groups, but the spotting was not so 

 pronounced as in the rubricalyx-rubrinervis-hyfaids, so that it was 

 not quite certain whether the unspotted group was a natural group 

 or simply the minus-end of a single fluctuating series. The grouping 

 of the young rosettes gave 97 spotted and 26 unspotted plants. None 

 of these rosettes closely resembled 0. Lamarckiana, being more lax, the 

 leaves having longer petioles and more tapering bases ; and they were 

 also more ascending than in the rosettes of 0. Lamarckiana. They 

 may be compared with 0. Lamarckiana in Plate VI, in which 0. rubri- 

 cafo/#-rosettes are at the top, 0. Lamarckiana at the bottom, and the 

 present series of hybrids in the second row from the top. The foliage 



