iQifi] DeVRIES— DIMORPHIC MUTANTS 279 



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 

 specimens with one dwarf. Of these 23 have flowered. 



O. latay.0. cana. — ^In this case the differences were already 

 very clear at the beginning of June. There were 34 lata, 6 1 Lamarck- 

 iana, 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 O. lata with the parent species. 



0. canaXO. nanella. — Only 24 seeds germinated. These pro- 

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

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



The reciprocal cross gave in 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. oblongaXO. cana. — ^Already in June the differences were 

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

 iana type, II oblonga, 1 albida, and i 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. canaXO. rubrinervis. — Only 20 seeds germinated, and yielded 

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

 which have flowered. 



The reciprocal cross yielded 59 plants, but in only two types, 

 which were the same as those in the first instance. Of these, 17 

 Lamarckiana and 8 subrobusta have flowered. 



Summary 



1. Besides 0. scintillans, which spHts under ordinary circum- 

 stances in every generation into nearly equal groups of plants of 

 the same type and others of the type of O. Lamarckiana, I have 

 cultivated pedigree families of 4 other mutants of 0. Lamarckiana 

 which behave in the same manner. They have been designated 



