Viburnum 



Caprifoliaceae 



881 



50 



Map 1932 



Sambucus pubens Michx 



Buds not scurfy-punctate during the summer phase, the surface not porous, 



usually somewhat glossy; leaves thin, acute or acuminate; subapical margins 



of principal blades concave; under surface of blades and petioles glabrous 



or some of the petioles under flowering cymes with rusty tomentum. 



Leaves caudate-acuminate, rarely some or all short-pointed at the apex; 



margins of petiole wide and wavy; stamens usually exserted half their 



length; shrubs of springy or wet places 4. V. Lentago. 



Leaves merely acute or obtuse at the apex; margins of petiole narrow, not so 

 wide or wavy as the preceding; stamens usually exserted about a fourth 

 their length; shrubs usually of moist places and generally near streams. 



5. V. pruni folium. 



Buds scurfy-punctate or rusty-pubescent, the surface porous, not at all glossy; 

 leaves very thick, usually rounded at the apex or short-acute; subapical 

 margins of principal blades convex or straight; under surface of petioles 

 and often the midrib, veins, or the whole under surface of the blade covered 



more or less with a rusty tomentum 6. V. rufidulum. 



Leaves with or without stipules, more or less pubescent both above and beneath 



but the pubescence never of a rusty color; petioles rounded; sides of stones 



of fruit more or less grooved. 



Teeth of leaves rarely more than 9 to a side; petioles less than 1 cm long; peduncles 



of cymes mostly 0.5-2 cm long; cymes mostly 3-5 cm broad. 



Under surface of leaves pubescent only on the midrib and on the principal 



veins or very sparingly between the veins 7. V. affine. 



Under surface of leaves densely pubescent over the entire surface 



7a. V. affine var. hypo?nalacum. 



Teeth of leaves mostly more than 9 to a side; petioles longer than 1 cm; peduncles 

 of cymes mostly 2-9 cm long; cymes mostly 2-7 cm broad. 



Bark exfoliating; leaves cordate at the base 8. V. molle. 



Bark not exfoliating; leaves not cordate at the base. 



Under surface of leaves pubescent all over 9. V. pubescens var. Deamii. 



Under surface of leaves pubescent only along and on the principal veins, 



rarely sparsely pubescent between the veins 



9a. V. pubescens var. indianense. 



1. Viburnum trilobum Marsh. (Viburnum Opulus var. americanum 

 (Mill.) Ait. and Viburnum Opulus of Britton and Brown, Illus. Flora, 

 ed. 2.) American Cranberrybush. Cramp Bark. Map 1933. Restricted 

 to the lake area where it is found in low woods and on the borders of 



