205 



In mumbers it can be expressed in such a way: 



A. B. С D. 



about about about about 



North American genera 42,867^ 12,807^ 37,157« '^Л^'' /o 



about about about 



0% 58,llVo 41,227„ 0,677o 



about about about about 



53,577, 5,36% 33,937o 7,U7, 



about about 



07o 59,42% 40,58% 0% 



Eurasian genera . . . 



North American en- 

 d e m i с genera .... 



Eurasian endemic ge- 

 nera 



Let us see in particular the genera common to Eurasia and to 

 North America from the rubrics B. and D. The Eurasian, exactly — 

 Gondwanian, origin of В up leur um, L. I have already prooved 

 in my monograph Ч The genus Dr epan ophyllu m, Wib. has 

 the centre of its developement in Eurasie, where are found also 

 the allied genera [x4.podicarpum, Мак. Helosciadium 

 Koch. A plum, L. A et h us a, L.], which connect it Avith an 

 indifferent group without evident speciahsation of the fruits, privatly 

 without „flotteurs" [Briquet] ^=:aërophora [mihi]. The 

 monotypical in North America Coelopleurum, Ledb. has 

 also near relations in Eurasia. [Chymsydia, Alboff. Physo- 

 lophium, Turcz. Agasyllis, Spr. Angelocarpa, Rupr. 

 Ar с h angelic a, Hoffm]. — Angelica, L. is in the same degree 

 distributed in Eurasia as in North America, but all its allied ge- 

 nera belong to Eurasia [Рейсе dan urn, L. Tmperatoria, L. 

 Tommasini a, Bert. Hipposelinum, Britt. Ц The evolutions- 

 centre of Cicuta L., without any doubt, is in North America; 

 but Cicuta, with „coccophorum distinctum liberum bifidum'- is 

 the probable derivative of the genus Oenanthe, i. e. of an 

 Eurasian genus;, probably the North American centre of Cicuta, 

 is according to my opinion, is a secondary centre. Finally, P h y- 

 s с a u 1 i s Tausch frome five species has four in North America 



1 Acta Horti Petropolitani. XXX 2 290 sq. 



^ Bullet, du laborat. de Bot, génér. de l'Univers. Genève. III 1 26. 

 de l'Herbier Boissier. VII 6 484. 



3 Hipposelinum, Britt, & Rose = Levisticum, Koch. 



-Bullet. 



