RANUNCULACEAE. 135 



Carpels i-ovuled : fruit an achene. 



Petals wanting ; sepals often petal-like. 



Sepals imbricated in the bud ; leaves all alternate, or only those subtending 

 the inflorescence opposite. 

 Flowers subtended by opposite or verticillate leaf-like bracts. 

 Styles short, not elongated in fruit. 7- Anemone. 



Styles much elongated in fruit, plumose. 8. Pulsatilla. 



Flowers not subtended by opposite or verticillate bracts ; leaves all alternate, 

 ternately compound. i7- Thalictrum. 



Sepals valvate in the bud ; leaves all opposite. 



Flowers cymose-paniculate, dioecious or polygamo-dioecious ; stamens and 



sepals spreading. 9- Clematis. 



Flowers solitary, perfect. 



Stamens erect ; sepals thickish, more or less converging ; staminodia 



wanting. lo. Viorna. 



Stamens spreading ; sepals thin, spreading from the base ; staminodia often 

 present. ii- Atragene. 



Petals usually present. 



Sepals spurred ; small annuals with basal linear leaves : receptacle in fruit 



elongated-cylindrical. 12. Myosurus. 



Sepals not spurred ; plant usually bearing cauline as well as basal leaves ; 

 receptacle in fruit spherical, conical or short-cylindric. 

 Achenes transversely wrinkled: petals white. 1,3. Batrachium. 



Achenes not transversely wrinkled ; petals yellowish at least without. 

 Achenes not ribbed. 14- Ranunculus. 



Achenes longitudinally ribbed. 



Achenes compressed ; leaves simple, crenate or lobed. 



15. Halerpestes. 

 Achenes terete; leaves compound. 16. Cyrtorhyncha. 



I. CALTHA L. Marsh-marigold, Meadow-gowan. 



I. Caltha leptosepala Hook. (C. rottindifolia (Huth) Greene; C. chiono- 

 phila Greene.) Along brooks and belowr the snow from the Canadian Rockies 

 to Colo. — Alt. 8000-12,000 ft. — Cameron Pass; Graymont; Beaver Creek; Al- 

 pine Tunnel; Bear Creek Divide; Marshall Pass; Pike's Peak; Red Moim- 

 tain, south of Ouray; Columbine; Grand Mesa; Carson; Gore Pass; Seven 

 Lakes; near fronton; Chambers' Lake; Gray's Peak; Front Range, Larimer 

 Co.; South Cottonwood Gulch, Chaffee Co.; Mt. Harvard; Lake City; Em- 

 pire; Rabbit-Ear Range. Routt Co. 



2. TROLLIUS L. Globe-flower. 



I. Trollius albiflorus (A. Gray) Rydb. {T. laxiis albiflorus Gray) In 

 swamps and along streams from Mont, to Wash., Colo, and Utah. — Alt. 900CK 

 12,000 ft. — Above Beaver Creek ; Leroux Park ; Cameron Pass ; Slide Rock 

 Cation ; Mt. Hesperus, above timber line ; Pagosa Peak ; Grand Mesa ; Gray- 

 mont ; Red Mountain ; Marshall Pass ; Crystal Lake ; headwaters of Clear 

 Creek; Massif de 1' Arapahoe. 



3. ACTAEA L. Bane-berry. 



Filaments whitish; raceme short; pedicels in fruit 1-3 cm. long. 



Fruit white, ellipsoid, 9-12 mm. long. i. A. eburnea. 



Fruit red, spherical or nearly so, 5-7 mm. long. 2. A. arguta. 



Filaments greenish ; raceme elongated ; pedicels very short, even in fruit less than 



I cm. long; fruit red. 3- A. viridiflora. 



