KEY. 119 



30. Ordinary petals present 31 



Petals none, or staminodia in their place 32 



31. Petals equal. Achenia in a head, pointed. A scale or 

 pore at the base of each petal, inside. Ranunculus. 



Petals unequal, several, and much smaller than the 

 sepals, passing gradually into stamens. Achenia in a head, 

 with plumose tails. V ines, climbing by the leaf-stalks. 

 Leaves ternate, whorlcd in fours at the nodes. Flowers purple, 

 large, solitary on both sides of each node. Sepals 4, colored, 

 purple. Atragene Americana, Sims. 



( Clematis verticillaris, D. G.) 



33. Petals none 33 



Staminodia unequal. A vine with whorled ternate 

 leaves 31 



Staminodia equal. Herb erect, clothed with silky 

 hairs. Achenia (50-75) bearing long, plumose tails. Sepals 

 4-6. Proper leaves radical, long petioled, cleft into many 

 wedge-shaped, or linear segments. A concave, rather cup- 

 shaped involucre below the middle of the stem. Flowers soli- 

 tary, large, pale purple, silky outside, preceding the leaves. 



Pulsatilla Nuttalliana, Gr. 

 {Anemone Nuttalliana, D. C.) 



33. Achenia bearing the persistent styles in the fovm of 

 naked, hairy, or ' plumose tails. Perennial herbs or vines. 

 Leaves opposite. Flowers single, or in panicled clusters. 



Clematis. 

 Achenia not tailed 34 



34. An involucre present, near the flower, or remote 

 from it 35 



Livolucrc none : 37 



35. Involucre very close to the flower, resembliilg a calyx. 

 Leaves all radical, cordate and 3- (rarely 5-) lobed. Scape 1- 

 flowered, hairy. Hepatica. 



Involucre remote from the flower ^ . 36 



30. Involucre of 2 or 3, variously divided leaves. The rad- 

 ical leaves 3- to 1- parted. Achenia (not grooved) with a 

 short, rarely elongated, beak, on a hemispherical, conical, or 

 even cylindrical receptacle. Anemone. 



