Trees, Shrubs and Vines 
79. Leather-flower. (Clematis viorna.) 
LEAF: pinnate (upper occasionally simple), opposite ; leaflets, 
3-7, entire or 2-3-lobed, ovate-lance-shaped or oblong, base occa- 
sionally slightly cordate. FLOWER: purple, large, single (no 
corolla, sepals 4, 1’ long, very thick and leathery, more or less 
grown together, pointed at apex, many stamens) ; May—August. 
Pennsylvania, Ohio, and south ; climbing, herbaceous, stalk a little 
grooved and ridged. (PI. VII.) 
80. Common Cinque-foil. Five-finger. (Potentilla 
canadensis.) 
LEAF: palmate ; leaflets, 5, 1-2’, obovate, base wedge-shaped, 
coarsely serrate toward apex. FLOWER: yellow (petals 5, 
roundish, stamens numerous), single. April-July; plant silky- 
hairy, often trailing, herbaceous. (Pl. VII.) 
81. Wild Strawberries. (Fragaria vesca, virginiana, and 
indica.) 
LEAF: trifoliate, clustered, radical, i.e., from the ground ; leaf- 
lets, 1-2’ long, obovate, base wedge-shaped, coarsely serrate, 
stipules growing to base of leaf-stem. FLOWER: white (petals 5, 
separate, roundish, stamens many), single on stem from ground ; 
in spring ; with leafless runners ; in 2 species :—vesca, with calyx 
spreading or reflexed after blossoming, and the small seed-cases 
on the surface of a rounded or conical receptacle ; virginiana, 
calyx erect after flowering, seed-cases sunk into pits on roundish 
receptacle. Another species (¢vdica), introduced, and locally 
spontaneous near Philadelphia, has the runners leafy, petals yel- 
low, leafy bracts larger than sepals below calyx, fruit tasteless. 
82. Running Buffalo Clover. (Trifolium stoloniferum.) 
LEAF: trifoliate ; leaflets, broad-obovate or reverse heart- 
shaped, finely serrate; long running stems. FLOWER : pur- 
plish-white, in ‘‘heads” (like other clover), but not densely 
flowered. Ohio, Illinois, and south; trailing, herbaceous. 
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