Other Characters in Oenothera Lamar ckiana. 475 



In 1890 I got two tricotyls in the LaevifoUa-i^.m\\y 

 (p. 273). In the spring of 1892 I sowed the seeds of the 

 previous harvest on a large scale in the greenhouse of 

 my laboratory. I searched for the tricotyls amongst 

 the many thousands of seedlings, and planted them out 

 in pots in May. There were 71 of them. Of these, 63 

 set seed in the same year; the seed of each plant was 

 harvested separately and sown. In this crop I counted 

 (March 1893) the tricotyls in 100-200 seedlings for 

 every seed-parent. Altogether I looked through over 

 13,000 seedlings, and found amongst them about 1% 

 tricotyls on the average. The proportions amongst the 

 individual seed-parents varied between and 2% ; only 

 five contained more ; in these the proportions of tricotyls 

 were 2.5 — 2.7 — ?>.2> — 3.4 and 3.8%. Occasional hemi- 

 tricotyls were discovered in this extensive experiment, 

 and a single syncotyl. Nothing was transplanted from 

 this crop. 



I found a tricotylous plant of O. nanella in 1889, 

 when 0. nanella first appeared ; in 1892 I also found three 

 tricotyls in this race, which was well established by this 

 time : they all remained dwarf, and set seed. In April 

 1893 these seeds gave four tricotyls in 800 seedlings, 

 i. e., 0.5%, and one hemitricotyl besides. The tricotyls 

 grew up as dwarfs ; the hemitricotyl was not planted out. 



In 1890 I found one tricotyl in the sowing of the 

 /aia-family of that year (p. 288). 



In 1890 I also found one hemitricotyl in the rubrincr- 

 T'W-family (p. 273), a single tricotyl in 1891, and numer- 

 ous tricotyls in the larger crops that were raised in 1892. 

 From these latter I have since formed a tricotylous sub- 

 family which I still cultivate, without, however, being- 

 able to increase the percentage of tricotyls to a better 



