730 



CORNACEAE 



Cornus 



Under surface of leaves appressed-pubescent or glabrous at maturity. 



Year old branches bright red; pith wide, usually more than a third the 

 diameter of the branch; under surface of leaves thickly appressed- 

 pubescent (sometimes old leaves becoming somewhat glabrous; fruit 



w hite 5. C. stolonifera. 



Year old branches gray or dull, reddish brown; pith narrow, usually less 

 than a third the width of the branch ; under surface of leaves sparsely 

 clothed with a short pubescence or almost glabrous. 

 Fruit white; inflorescence more or less appressed-pubescent with color- 

 less hairs; peduncles 2-2.5 cm long; under surface of leaves more 

 or less farinose (this species generally with a brownish pith, espe- 

 cially of two-year-old branchlets) 7. C. racemosa. 



Fruit blue; inflorescence glabrous or appressed-pubescent; peduncles 

 2.5-7 cm long; under surface of leaves green; pith of branchlets 



white 8. C. stricta. 



Pith of branchlets and of one and two year old branches tawny, sometimes white in 

 the branchlets and in one year old branches of nos. 6 and 8. 



Leaves rough above, woolly-pubescent beneath ; fruit white 6. C. asperifolia. 



Leaves not rough above, appressed-pubescent beneath; fruit white or bluish. 

 Pubescence of the under surface of the leaves consisting of colorless hairs, only 

 those of the midrib sometimes reddish. 

 Branches reddish brown; branchlets densely pubescent; calyx lobes 0.75-1 mm 



long; fruit bluish 9. C. obliqua. 



Branches gray; branchlets glabrous or glabrate; calyx lobes less than 0.75 



mm long, usually minute or up to about 0.5 mm long; fruit white 



l.C. racemosa. 



Pubescence of under surface of the leaves consisting of reddish hairs; fruit 

 k] u j s h 10. C. Amomum. 



1. Cornus canadensis L. (Chamaepericlymenum canadense (L.) Asch. 

 & Graebn.) Bunchberry. Map 1554. Found only in Lake and Porter 

 Counties near Lake Michigan. Very rare. I have it only from the Mineral 

 Springs bog in Porter County where it was formerly common. McCaslin's 

 report from Jay County and Scott's report from Kosciusko County no 

 doubt should be referred to some other species, probably to Medeola 

 virginiana. 



Lab. to Alaska, southw. to N. J., W. Va., Ind., Minn., Colo., and Calif. 



