DICOTYLEDONS. 77 



I. CALTHA. 



Perennial aquatic herbs; leaves undivided; sepals 5-9, 

 petal-like; petals none; pistils 5-15, stigmas sessile; ovaries 

 many-seeded. 



C. PALUsTRis L. Marsh Marigold. Stem thick, smooth, hol- 

 low, furrowed, 10-1.5 in. high ; leaves loiig-petioled, round or broadly 

 reniform, smooth, thick, toothed or nearly entire ; flowers bright 

 yellow, showy, li in. broad; stamens numerous; follicles oblong, 

 pointless, compressed, many-seeded. April-May. In wet meadows 

 and swamps. More common northward. 



II. ISOPYRUM. 



Perennial from small tubers ; stem slender, smooth ; leaves 

 alternate, compound ; flowers axillary and terminal, solitary, 

 white ; sepals 4-6 ; petals minute or wanting ; pistils 2-20 ; 

 follicles sessile, 2-seeded. 



I. BiTERNATUM T. & G. SpRiNG Beauty. Stem erect, rarely 

 branched, 6-10 in. high; radical leaves on long petioles, twice ;]-com- 

 pound ; stem leaves sessile, ternate ; leaflets ovate or obovate, 2-^J- 

 lobed ; flowers white, 1 in. wide ; sepals oval, petal-like ; petals none ; 

 stamens many ; pistils 3-0 ; follicles spreading at maturity, jx^inted. 

 April-May. Shady woods. Resembling Sijiulexinon thalictroo/es in 

 general appearance, but distinguished by the ovary being 2-seeded. 



III. ACT^A. 



Perennial ; stem simple ; leaves 2-r)-ternate ; leaflets ovate, 

 sharjdy cut or tootlied ; flowers white, in a short and tliick 

 terminal raceme ; sei)als 4-5, soon deciduous ; petals 4-10, 

 small; pistil single, stigma 2-lobed; fruit a many-seeded 

 berry. 



A. ALU A Bigel. Baneherrv. Stem erect, smootli or nearly .so, 

 IS-'Jl in. high ; leaves large and spreading; leaflets tliin; racemes 

 very liroad; ]>etals slemlcr, truncate; pedic»'ls red, tliickencd in 

 fruiting; berries white. Ahiy-.Iune. In rich woods ; more common 



ill 1 he ni(tiiiilaiii reiiions. 



