DICOTYLEDONOUS PLANTS 77 



1. N. advena. Yellow Pond Lily, Cow Lily, Spatterdock. 

 Leaves oval or orbicular, rather thick, often downy beneath. Flowers 

 bright yellow, 2-3 in. in diameter, depressed-globular. Sepals 6. 

 Petals thick and fleshy, truncate. Stamens in several rows, anthers 

 nearly as long as the filaments. Li slow streams and still water.* 



32. RANUNCULACE^. Buttercup Family. 



Herbs, rarely shrubs, usually with biting or bitter juice. 

 Leaves radical or alternate (in Clematis opposite ; stem-leaves 

 or involucre whorled in anemone) ; stipules none or adnate to 

 the petiole. Floral organs all distinct and unconnected. 

 Sepals 5 or more (rarely 2^), falling early, often petal-like. 

 Petals none, or 5 or more (rarely 3). Stamens many. Carpels 

 many, 1-celled ; stigmas simple ; ovules 1 or more. Fruit 

 composed of 1-seeded akenes or many-seeded follicles. Seeds 

 small. 



A. 



Flowers irregular. 



With a spur. Delphinium, VH. 



With a hood. Aconitum, VIII. 



B. 

 Flowers regular. 



1. Petals present (in c not very unlike the stamens). 



(a) Petals very large and showyo Pseonia, I. 



(&) Petals small, tubular at the tip. Coptis, lY. 



(c) Petals narrow^, spatulate, on slender claws. Actsea, Y. 



(d) Petals prolonged backw^ard into spurs. Aquilegia, VI. 



(e) Petals flat, with a little scale at the base, inside. 



Ranunculus, XIII. 



2. Petals none, or very small and stamen-like. 



(a) Sepals yellow. Caltha, II. 



(&) Sepals greenish or wdiite, falling as the flower opens. 



Thalictrum, XIV. 



(c) Sepals white or colored, involucre sepal-like. Hepatica, X. 



(d) Sepals 4. Plants climbing. Clematis, XII. 



