12 RANUNCULACE^E. 



Tkollius. (Plate 11.) Petals indefinite, small and stamen-like, hollow- 

 ed near the base. Follicles numerous, cylindraceous, pointed with 

 the subulate style, sessile, many-seeded. Leaves palmately-parted. 



Isopyrum. (Plate 12.) Petals 5, minute and tubular, or, in subgen. 

 Enemion, none. Follicles 2-20, sessile, few - several-seeded. — 

 Leaves 2 - 3-ternately divided. 



Coptis. (Plate 13.) Petals 5 or 6, small, unguioulate, hollowed at the 

 apex or hooded in the middle. Follicles 3 - 10, conspicuously stipi- 

 tate, several-seeded. — Leaves 1 - 3-ternately divided, all radical. 



Aquilegia. (Plate 14.) Petals 5, larger than the sepals, produced be- 

 low into a large hollow spur. Follicles 5, sessile, crowned with fili- 

 form styles, many-seeded. — Leaves 2 - 3-ternately divided. 



# # Flower irregular and unsymmetrical. Follicles several-seeded. Herbs. 

 Delphinium. (Plate 15.) Sepals 5 ; the outer one larger and spurred. 



Petals small, of two kinds ; two of them produced into a spur which 

 is received into the spur of the calyx ; the two others unguiculate. 

 Aconitum. (Plate 16.) Sepals 5 ; the outer and larger one galeate, in- 

 closing two small incurved-saccate petals raised on long claws : the 

 other petals minute and stamen-like, or none. 



* * * Flower regular and symmetrical. Follicles several, by abortion 1- 



seeded. Shrubby. 

 Zanthorhiza. (Plate 17.) Sepals 5, spreading. Petals 5, short, un- 

 guiculate, 2-lobed, hollowed at the apex. Stamens 5 or 10. Style 

 becoming lateral in fruit. Seed pendulous. — Suffruticose ; the pin- 

 natelv-divided leaves and racemes from scaly buds. 



Tribe V. CIMICIFUGEiE. — Sepals imbricated in aestivation, peta- 

 loid, caducous. Petals small and plane, or none. Ovaries 1 - 15, baccate 

 or follicular in fruit. Ovules 2 - many ; the raphes collateral. — Herbs. 

 Leaves all alternate. 

 Hydrastis. (Plate 18.) Sepals 3, very caducous. Petals none. Ova- 

 ries numerous, imbricated in a head, 2-ovuled, baccate in fruit. 

 Seeds 1 or 2, ascending. — Flower solitary. Leaves palmately lobed. 

 Act^a. (Plate 19.) Sepals 3-5. Petals, or staminodia, 4- 8, oblong 

 or ovate, entire. Ovary solitary. Berry many-seeded. Seeds flat, 

 horizontal. — Raceme short. Leaves 2 - 3-ternately compound. 

 Cimicifuga. (Plate 20.) Sepals 4-5. Petals, or staminodia, 3-5, 

 mostly 2-cleft or forked at the apex. Ovaries 1-8. Follicles sev- 

 eral - many-seeded. — Raceme virgate. 



Tribe VI. PiEONIEiE, with a coriaceo-foliaceous and persistent im- 

 bricated calyx, ample plane petals, and a fleshy hypogynous disk around the 

 base of the few ovaries, which form leathery follicles in fruit, comprises 

 the genus Paeonia alone ; of which there are no species indigenous within 

 the limits of the United States. 



