Index 



aculeata, taxonomic relations of, 

 419. 



alpina, 382. 



aspora, meiosis, and cliroinosome 

 liMigths in, 40.'); diplo])hasc, 

 ])arasyndcsis, proplia.se of moi- 

 o.sis, and zygopliase, 40(); dia- 

 pliasc (diakinosis) in, 407; 

 taxonionic relations of, 419. 

 X aculeata, nieiosis in, 412, 416; 

 meio.sis, pollen formation and 

 fertility in, 420. 

 X bursifolia, nieiosis in, 411, 412, 

 ■fertility, tetrads, and micro- 

 nuelei in, 414; nieiosis. pollen 

 formation and fertility in, 420. 

 X capillaris, nieiosis in, 415. 



biennis, cliimeral root of hybrid of, 

 343; p^eograpliie distribution 

 of, 391; a polyploid species, 

 391. 



Bureninna, cliimeral plant of, 344; 

 multinucleate cells of, 345; 

 cell fusion in, 346. 



bursifolia, meiosis, and chromo- 

 some lengths in, 405; diplo- 

 phase, parasyndesis, prophase 

 of meiosis, and zygophase in, 

 406; diaphase (diakinesis) in, 

 407; taxonomic relations of, 

 419. 



capillaris, 378, 379 ; (virens), 191flF. ; 



inbreeding and crossbreeding in, 



205-11 ; inheritance in, 217-36, 



249-79; trisomic types in, 381, 



394 ; polyploid egg cells in, 384 ; 



a haploid, 410. 

 X aspera, 401. 

 Dioseoridis, 366, 378, 379, 382; 



tetraploid area of, 343. 

 Hakeli, tetraploidy in, 343 n. 1. 

 montana, tetraploidy in, 343. 

 neglecta, 382. 

 taraxacifolia, taxonomic relations 



of, 419. 

 taraxacifolia x tectorum, meiosis in, 



412, 415; fertility in, 416; 



meiosis, pollen formation, and 



fertility in, 420. 

 tectorum, 378, 379, 382; giant cells 



in, 346; taxonomic relations of, 



419. 

 setosa, chimeral root of hybrids of, 



343. 



Crepis capillaris (K) Wallr., Inbreed- 

 ing and Crossbreeding in, 205- 

 1«>; II. Inheritance of Some 

 Morphological Characters in, 



217^2; Inheritance in, III. 

 Nineteen Morphological and 

 Three Physiological Characters, 

 249-96. 



Crepis, Chromosomal Chimeras in, 



343-54. 



Crepis, Chromosome Number and In- 

 dividuality in the Genus. I. A 

 Comparative Study of the 

 Chromosome Number and Di- 

 mensions of Nineteen Species, 

 297-314; II. The Chromosomes 

 and Taxonomic Relationships, 

 315-41. 



Crepis, Interspecific Hybrids in. I. 

 Crepis capillaris (L.) Wallr. x 

 C. tectorum L., 191-204. 



Crepis, Meiosis in Two Species and 

 Three Hybrids of, and Its Bear- 

 ing on Taxonomic Relationship, 

 401-32. 



Crossbreeding and Inbreeding in 

 Crepis capillaris, 205-11. 



Crossing-over phenomena, illustrated, 

 408; cytological evidence of, 410. 



Crown galls, on sugar beets, 347. 



Cytogenetic behavior of triploids, 



380-83. 

 Cytological evidence of crossing-over 



phenomena, 410. 

 Datura, mutations in, 83; tetraploid 



shoots'in, 346, 348; triploids in, 



383, and their progeny, 389. 



Dermatogen, of Cannabis sativa and 

 Spinacia oleracea, 347. 



Diakinesis. See Diaphase. 



Diaphase in Crepis, 407. 



Diploid eggs, parthenogenetic develop- 

 ment of, 388. 



Diploid gametes, origin of, 348, 385; 

 as a source of triploids, 384. 



Diploid pollen, possibility of, 385. 



Diplophase in Crepis, 406. 



Dispermy as a cause of triploids, 384, 



Doubleness of flowers, inheritance of, 

 122, 157. 



Drosera scheme, used in partial pair- 

 ing of chromosomes, 418. 



Drosophila, balanced-factor hypoth- 

 esis in, 83; Muller's report on 

 beaded wing in, 83, 153-54; Mor- 

 gan's investigations on, 217. 

 ampelopliila, 72. 

 melanogaster, 191. 

 Elimination, selective, in Snowflake 

 varietv of Matthiola, 121, 132, 

 152. 



[434] 



