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 thict and fleshy, truncate. Stamens in several rows, anthers 

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



32. RATfUNCULACE^. 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. Ploral organs all distinct and unconnected. 

 Sepals 5 or more (rarely 2-4), 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, VII. 



With a hood. Aconitum, VIII. 



B. 

 Flowers regular. 



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



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



(V) Petals small, tubular at the tip. Coptis, IV. 



(c) Petals narrow, spatulate, on slender claws. Actaea, V. 



(d) Petals prolonged backward 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-Kke. 



(a) Sepals yeUow. Calfha, II. 



(6) Sepals greenish or white, falling as the flower opens. 



Thalictrum, XIV. 



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



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



