132 ATKINSON— TWIN HYBRIDS. 



more or less crinkled as in lamarckiana. The stem tubercles are 

 red. The calyx bud is rather robust, about 3 cm. long by 7-8 mm. 

 stout, tapering slightly, and then abruptly at the base of the tips, and 

 there is considerable red in longitudinal bars. The flowers are 

 large, up to 6.5 cm. broad; petals 25-30 mm. long and 30-35 mm. 

 broad, broadly obovate and emarginate, overlapping or just closing 

 the gap. The pod spikes are rather dense ; the pods 3-3.5 cm. long 

 and 6-7 mm. broad, often with red bars. 



Lamarckiana Type; Rosettes. — No fully developed rosettes of 

 the lamarckiana type appeared in this annual culture. The type of 

 rosette, however, is shown in Fig. i, PI. I., from the F, culture. 

 As a whole it resembles neither lamarckiana nor pycnocarpa. An 

 analysis of the rosette, however, reveals a combination of lamarcki- 

 ana and pycnocarpa characters. The edge character of the leaves, 

 toothedness, is that of lamarckiana, while the narrowness, non- 

 crinkledness and furrowedness are those of pycnocarpa. 



Lamarckiana Type; Mature Plants. — There were 35 mature plants 

 of this type in the culture. They agree with those of the lamarck- 

 iana type in the reciprocal cross. The plants (annuals) were 100- 

 iio cm. high. The stems are green, with red tubercles, a few red 

 tubercles also on the young ovaries. The foliage is rather light 

 green. The leaves are rather narrow and long, over the middle 

 part of the stem 15-17 X 3-3-5 cm., the edge only slightly toothed. 

 The lower bracts are leaf like, sessile, up to 13 cm. long by 3.5 cm. 

 broad. The calyx buds are usually green, but sometimes with a 

 flush of red in spots, 3-3.5 cm. long by 8 mm. stout at the base, 

 tapering gradually to the apex or somewhat abruptly contracted at 

 the base of the tips. The buds and flowers are intermediate in size 

 between the two parents ; petals 32 X 30-40 mm. The pod spike 

 is lax. 



CEnothera pycnocarpa X CE. lamarckiana (No. p8). — There were 

 approximately 400 plants in this culture. There were 360 of the 

 lamarckiana type, which agree in all respects with the lamarckiana 

 type of the reciprocal cross. The remaining 39 plants presented 

 two types of flowers, 34 with large flowers and a long fruiting spike 

 60-70 cm. long; bracts, especially the lower, large and leaf-like, no 

 flush of red observed on the calyx bud, except rarely, the leaves 



