NEW DIMORPHIC MUTANTS OF THE OENOTHERAS. 107 



the anthers, insuring natural self-fertilization, as in 0. biennis. 

 Besides these intermediate types there were 7 dwarfs, which had 

 the gray, narrow and pointed foliage of 0. cana, and which in the 

 table have been calculated together with the high specimens of 

 the cana type. 



The reciprocal cross yielded only laeta and velutina, together 

 57 plants, of which about one-half of each type have flowered. 



0. cana x 0. Lamar cki ana.— The two types of this culture were 

 exactly the same as in the self-fertilized offspring of the mutant. 

 There were only 19 specimens, of which 6 were cana, 11 Lamarcki- 

 ana and 2 nanella. The dwarfs combined the marks of cana with 

 those of nanella and have been calculated in the table with the 

 cana specimens of tall stature. 



The same cross had been made in 1907, the seeds being sown 

 in 1913. In this case there were 50 offspring, among which 26 

 were cana and 23 were Lamarckiana, while one dwarf occurred. 

 The percentage figures, 52 cana and 46 Lamarckiana, confirm those 

 of table X. 



The reciprocal cross yielded only normal Lamarckiana, 60 spe- 

 cimens with one dwarf. Of these 23 have flowered. 



0. lata x 0. cana.— In this case the differences were already 

 very clear at the beginning of June. There were 34 lata, 61 Lamarcki- 

 ana and 3 mutants (one each of cana, nanella and oblonga). In 

 August 7 lata and 9 Lamarckiana flowered. They repeated the 

 type of the hybrids of 0. lata with the parent species. 



0. cana x 0. nanella. — Only 24 seeds germinated. These pro- 

 duced 5 cana, 17 Lamarckiana and 2 dwarfs which had the charac- 

 teristics of 0. cana. All these plants have flowered. 



The reciprocal cross gave 1 1 1 plants, of which one was a cana 

 of normal stature, 105 were cana with the dwarfish stature of 

 0. nanella and 5 had the type of 0. Lamarckiana. Two of this 

 last type, the normal specimen of cana and 22 dwarfs flowered in 

 August. 



0. oblonga x 0. cana.— Already in June the differences were 

 clear and unmistakable. Among 72 plants 59 were of the Lamarcki- 

 ana type, 11 oblonga, 1 albida and 1 rubrinervis. Of these, 2 oblonga 

 and 12 Lamarckiana flowered; most of the others lived through 

 the summer in the condition of large rosettes of radical leaves. 



0. cana x 0. rubrinervis. — Only 20 seeds germinated and yielded 

 8 cana of the normal type, 5 Lamarckiana and 7 subrobusta, all of 

 which have flowered. 



