:i02 



The following lable conlents Ihe diflerent chiomosome numbers 

 in the forms invesligated: 



4. The diploid and the tetraploid forms of the types 1 and 2 

 are represented in about equal frequence in my material, the hexa- 

 ploid (type 3) beiiig rarelj' met with. Most of these roses of the 

 types 1 — 3 are of asiatic or american origin. 



Diploid are for instance all investigated forms belonging to the 

 section of Systylae, persica — the only rose with whole leaves — 

 Banksiae, carolina, nitida, gymnocarpa, pisocarpa, blanda, arkansana, 

 riigosa, macrophylla, microphylla, sericea, omiensis, liicens, elegantula, 

 Hiigonis, \Villmottiae, sertata, certain forms of chinensis, cinnamomea 

 Fendleri, beggeriana, läxa, nutkana, Woodsii, webbiana, and nume- 

 rous hybrids. 



Tetraploid are all investigated forms of gallica, two varieties of 

 damascena [variegata, »York and Lancasler», and trigintipetala, the 

 bulgarian oil-rose), centifolia var. miiscosa, liitea, hemisphaerica, pim- 

 pinellifolia, liicida, hiimilis, Davidi, dahiirica, fedtschenkoana, pralincola, 

 most of the forms belonging to pendidina and acicularis, certain 

 varieties of cinnamomea, Moyesii and setipoda, and several hybrids, 

 among them all the investigated garden roses belonging to the 

 groups of the remontants, tea-h^^Drids, and Pernetianas. 



Hexaploidy was stated in Sweginzowii and in specimens belonging 

 to acicularis, Fendleri, nutkana, manca, setipoda, and Moyesii. 



In order to avoid synonyms in this brief paper Ihavenotconsequently 

 used or mentioned the in many cases new names given bj' Almquist. 



5. As it will be seen from above, certain species have varieties 

 with different chromosome numbers, for instance cinnamomea, acicu- 

 laris, and nutkana. 



