90. CORNACEAE 1 69 



2. Leaves opposite. 



3. Lower surface of blades with api^ressed liairs, or none. 



4. Leaves green beneath, not at all farinose; pith white; fruit 

 turning bluish; low woods, or in swamps, s. 111. June. 



[C. stricta Lam. J C. joanina Mill. 



4. Leaves pale and microscopically farinose or pulverulent 



beneath. 



S.Young twigs tomentulose; pith brown; fruit blue; moist 



ground, common throughout 111. May-June. [C. pur- 



pusi Koehne; C. amomu?n of auth., not Mill.] Pale 



Dogwood C. obliqua Raf. 



r>. Young twigs strigillose to glabrous; fruit white. 



6. Matiu'e twigs gray or brown ; cymes loosely-flowered, 

 convex ; stone of the fruit not compressed ; erect 

 shrubs chiefly along fences, roadsides, and in clear- 

 ings, common. May-June. [C. paniculata L'Her.] 



Gray Dogwood C. racernosa Lam. 



6. Mature twigs bright red; pith white; cymes dense, flat- 

 topped; stone compressed; stoloniferous spreading 

 Ghrubs of swampy ground, in the n. part of the state, 

 extending southward in the valley of Illinois R. to 



Tazewell Co. June-July. Red-osier Dogwood 



C. stolonifera Michx. 



3. Lower surface of blades with loose, partly spreading pubes- 

 cence, at least on the veins. 

 7. Lea\es ovate-lanceolate to elliptical; veins 3 or 4 pairs; 

 fruit white. 

 8. Leaves finely pubescent on the upper surface ; pith white, 

 large; branches red; lake shores, Cook and Lake 

 counties. Bailey's Dogwood ....C. baileyi Coult. & Evans 

 8. Leaves scabrous above; pith brown, small; branches gray 

 or brown ; moist ground on roadsides or along streams, 

 common. May-June. [C asperifolia of auth.. not 



Michx.] Rough-leaved Dogwood 



C. drummondi C.A.Mey. 



7. Leaves roundish-ovate, woolly pubescent beneath at matur- 

 ity; veins usually 6-9 pairs; branches gray or brown, pith 

 white; fruit light blue; dry woods, n. 111., extending 

 southward to Kankakee and La Salle counties. May. 



[C. circinata L'Her.] Round-leaved Dogwood 



C. rugosa Lam. 



1. Flowers capitate, with an involucre; fruit red. 



9. Tree; fruit ellipsoid; dry woods, local; chiefly in the s. half of 

 the state, extending northward to Vermilion and Schuyler 



counties. April-May. Flowering Dogwood C. florida L. 



9. Herb or subshrub 10-20 cm tall; fruit globose; woods, known 

 from Lake, Cook, Ogle, and La Salle counties. May-June. 

 Bunchberry C. canadensis L. 



