cilnjiis l'ruil-. 



|)<'lil' llf l'illlllM' 



."se. I\ Cd.NKKIlKNCK INTKliN A rioNAI.K W. I.KM-TInl K. 



Tlir cill-cilliiMs, (ir criissrs liclwcrii llic IcilKili :iMil l'ilni^ I ri fiilidln . on llir 

 conli'arv, show iicarlv 20 pri' cciil ol' sccdlinj^.s willi an cxaf^^cralcd (Icvcloiinicnl 

 of hypopliylls and in \\\i- niajorily of cases ncvcr produco any normal l'oliatfc 

 leaves al ail (Fif4'. .">) dyiny IVoni slarvalion sliorlly al'lor llic reserve j'ood nialc- 

 rial of Ihe seed is nspd iip. One parent, Cilruf trifoliala^ lias a few liy|iopliylls 

 alonf»' lh(» linse of Ihi' sloni of llie yount:^ seedlinf,»' i\'\'^. 0). wliilc Uie Icinon. likc 



llic orariirc and ail olliiT 

 coninion 

 -liows a 



lar^c, ronndi'd, scssilc, 

 o|)posile leaves as llie firsl 

 posl-colyledonary foliacé. 

 The excessive de velopmeni 

 of liypophylls represenls 

 an inlensificaiion of one of 

 Ihe parental cliaraclers. 



liesides the seedlings 

 willi hypophylls, many of 

 llie citrenions show wide 

 variations in Ihe character 

 of (lie leaves. Some show 

 five leaflels (tliis occasio- 

 nally ocrnis in citranges 

 alsoi', olhers show unifo- 

 liale leaves or leaves wilh 

 very much reduced side 

 leaflels (Fig. S) (which is 

 rarely or never seen in ci- 

 Iranges). Mosl of Ihe ci- 

 trenions hâve trifoliale 

 leaves wilh large laleral 

 leallets (Fig. !>), which is 

 Ihe type characterislic of 

 cilranges. 



There are several hnn- 

 drcd of thèse hybridsnnder 

 slndy. 1"lii('c \arieties of lemon, Ihe Enreka, ^'iIla Francaand Lishon (Fig. Itl). 

 wcre nscd in crossing wilh Citrns trifolinlo and ail Ihree yielded a considei'able 

 proportion of seedlings (nsually ahoul one-tiflh) wilh pronounced hypophylls. 

 As yet none of llie citrenions lune liornc fruil, so il is nol [lossible to eom|)are 

 the variai ions in the fruits wilh lliose of the leaves. Donbtiess Ihe striking fruit 

 variations shown by the cilranges will beequaled or more probably exceeded by 

 Ihe cilremons, since the la lier show a decidedU yrealer lange of fidiar variation =. 



V\.^. (i. _ CJliils lilfolnihl 

 sliiiwiii^ Hic liv{>i>pli\IU a 

 This s|iccirs ci-ossi'd willi 



Cl-.isv,.,! «,lli II,,. Iriii.NI. Ih 



(KIMPlOl. 

 Hic Inwcr 

 .|-all;;c |i|-(. 



'illill^ |i|a 



rai 



1. Soiiie of llie cilraiiRes i 

 show a considérable proporlic 

 Irifolinta. 



2. As a millier ol' l'acl, llie (liree liybiids in Figs. 

 seeilsola siiiu|e IViiit. Tlie diirereiices iliey show, how 

 k'ss lliaii lliiise fouiul aiiioii"- sisler hvlirids. 



I liy crossing Ihe Wasliinylon Navtl i 

 ilnliate leaves (Fifr. 7) — a cliaiaclc 



wilh f.ilnis hifulinlii 

 M- cxh hilcil hv l.ihii.i 



-isler livl.i 

 hiit, en I 



