APPENDIX 207 



Thus the list may be considered in the following light: the plants 

 shown have at one time or another displayed the responses indicated 

 by the category in which they are now placed. An investigator might 

 expect them to respond again in a like manner, but he should not be 

 greatly surprised if they don't. His conditions may be different, he 

 may have plants with a different genetic constitution, and his ideas 

 of classification may differ from those of the original investigator. 



Except for a few plants for which references are directly cited, most 

 plants were taken from two lists. Those followed by H and a number 

 are taken from: William S. Spector (editor, 1956, Handbook of 

 Biological Data, W. B. Saunders Co., Philadelphia and London, 

 Table 391, page 460). The number refers to the number of the plant 

 in the table. Plants marked with C are taken from P. Chouard, 1960, 

 Vernalization and its relations to dormancy. Annual Review of Plant 

 Physiology, 11, 191-238. I am grateful to Prof. Chouard for examin- 

 ing the list (November, 1962) and offering suggestions (he strongly 

 emphasized the genetic variability which might be expected). I am 

 also indebted to Mrs. Catherine Kline who assembled the data on 

 punched cards and helped with compilation of the lists, especially 

 the common names. 



- • 1 . Day-neutral plants, no causative temperature effect. These are the plants 

 with the least response to their environment as far as their flowering goes. 

 They flower at about the same time under virtually all conditions. Probably 

 most of the plants in this category are valid, but some may be moved after 

 future research to categories such as : promotion of flowering by alternation 

 of temperature. The tomato plant is a good example of a plant that has 

 already been changed in this way. 



Cucumis sativus, H. 9 Cucumber 



Euphorbia peplus, C. 218 



Fagopyrum tataricum, Skok and Scully, Buckwheat 



1955. Botan. Gaz. 117: 134-141 

 Fragaria chiloensis, H. 19 Strawberry, everbearing 



Gardenia jasminoides fort., H. 84 Cape jasmine 



Gomphrina globosa (personal Globe-amaranth 



observation) 

 Gossypium hirsutum, H. 59 Cotton, one variety 



Helianthus tuberosus, H. 1 An artichoke variety 



Ilex aquifolium, H. 86 English holly 



Impatiens balsamina, H. 71 Balsam 



Lunar ia annua, C. 218 Honesty 



Nicotiana Tabacum, H. 64 A tobacco variety 



Nicotiana silvestris, C. 198 



Phaseolus lunatus, H. 2 Lima bean, a variety 



Phaseolus vulgaris, H. 3 A variety of String bean 



Poa annua, H. 27 Bluegrass, annual 



