CHROMOSOME NUMBERS IN THE GENUS HYPERICUM 381 



the tiict that within several ^ 



• * 



lO 11 12 



genera and families such '••^ 



conditions have been found, 



thus lor instance mar- 



kedly with Chrysanthemiim i z 34. 



(T AH ARA 1915 and 1921). 



But genera, where this is ^ 



not the case, where ttie fi- • 'i •# '%^ ^\ 



gures are not multiples, # / • #• #*• •«• 



have also been studied, thus, 



for instance, Rosenberg 5 6 i g 



(1918 and 1920), and 



Babcock and Collins (1920) 



have found 3, 4, 5, 6, 7, 8, 



9, . . . chromosomes in dif- 



ferent Crcpis species. The ^^A 'V« 



genus Hypericiim represents ^ * 



another example of the 



same kind. The chromoso- 



me numbers found here — 



7, 8, 9, 16, 20 — are not ••_•• 



multiples; in other words, 



there is no fundamental 



number applicable to the 



whole genus. Nor is it .,.,.„ , , » • , x ■ • 



^ rig. 1. 1 : H. Ascijron, liomoeotypical nietaphasis. 



probable that there exists 3 _ 9.- H. Androsacmum, liomoeotypical metapha- 



series of chromosome num- sis. — 3: H. inodomm, liomoeotypical metapiia- 



, .., . rr • ••! sis. — '».//. /?/rcmn/7J, liomoeotypical metapliasis. 



bers withm Hupcriciim with ... . , . ■ , ^ , • ,. 



^' — o; H. cons, liomoeotypical metapnasis. — 6; 



the fundamental numbers 4, //. pohjphijllnm, heterotypical anaphasis. — 7; 



7 and 9. The existence of '^- hiisulum, lieterotNplcal anaphasis. — <V.- H. 



p , I • . maciilalum, liomoeotypical luiapliasis. — .9; H. 



senes ot such numbers is to , , ^ . • r i • n, u 



aciitum, lieterotj'pical anaphasis. — lO: H. moii- 



be COnsidered as a proof of tanum, homoeotypical metaphasis. — ll.H.lo- 



the faet that some of the mentomm, homoeotypical metaphasis. — 12: H. 



f. . nerforatiim, heterotypical anapiiasis. — 13: H. 



species, atter previous cros- .'..,. , . , ■ , , ■ ^, 



^ ^ onganifoliiim, heterotypical anaphasis. — /».• 



Sing, have been developed II.' orientalc, heterotypical anaphasis. — 15: H. 

 by an addition of chromoso- rumelicum, heterotypical anaphasis. — 16: H. 



r . 1 • i nrolificum, heterotypical anaphasis. 



mes trom species, whicti ' ' • ' ' 



have a lower chromosome number; this process, liy which the series 



of chromosome numbers are formed, shows us that the species within 



one series must be more closely related to one another than they are 





