100 RANUNCULACEAE (BUTTERCUP FAMILY) 



CLEMATIS (CLEMATIS) 



Perennial, more or less woody, either climbing vines or else erect or 

 ascending herbs. Leaves simple or compound; petioles slender, serving 

 as tendrils. Sepals 4-5, petal-like. Petals none or shorter than the sepals. 

 Stamens many. Akenes many; styles long, persistent. (Gk. klema 

 = a tendril ; the petioles coil tendril-like.) 



A. Herbs, erect. 



B. Petiolules all straight; leaf segments linear to lanceolate. E. 



C. douglasii (SUGAR BOWLS) 



BB. Petiolules of some of the leaflets contorted as if for climbing; leaf segments 

 oblong to ovate-lanceolate. E. C. scottii (SCOTT'S CLEMATIS) 



AA. Shrubby, climbing vines. 



C. Flowers white, cymose-paniculate; sepals 8-13 mm. long; leaves pinnately 

 5-7-foliolate. 



D. Akenes silky-pubescent with straight hairs. E. C. ligusticifolia (VIRGIN BOWER) 

 DD. Akenes woolly-pubescent with crinkly hairs. E. C. suksdorfil 



CC. Flowers blue, solitary; sepals 25-50 mm. long; leaves i-2-ternate. 



E. Leaves ternate, entire or merely toothed. E. C. occidentalis 

 EE. Leaves biternate, incisely toothed or lobed. C. E. C. alpina 



MYOSURUS (MOUSETAIL) 



Herbs, annual, small. Leaves linear or linear-spatulate, basal. Flowers 

 solitary, on simple scapes. Sepals 5-6, spurred at base. Petals o or 5-6, 

 with long claws, with a pit at tip, greenish yellow. Stamens 5-25. Akenes 

 many, apiculate or aristate, on a slender or conical receptacle. (Gk. 

 mys = a mouse, oura = a tail; referring to the long tail-like head of 

 akenes.) 



A. Carpels prominently beaked; carpel spike 2-25 mm. long. 



B. Carpel spike sessile; petals always present; E. M. sessills 

 BB. Carpel spike on a scape 2.5-5 cm. long; petals sometimes none. E. 



M. ape talus 

 AA. Carpels obscurely beaked. 



C. Carpel spike 1-5 cm. long, 6 mm. or less thick; seed oblong. (See BB.) 

 CC. Carpel spike shorter, thicker; seed oval. 



D. Not a salt-marsh plant. W. E. M. minimus 



DD. Salt-marsh plant, mainly maritime. W. M. major 



BATRACHIUM (WATER CROWFOOT) 



Herbs, annual or perennial, aquatic or subaquatic. Submerged leaves 

 filiform-dissected; emersed leaves when present with flat blade; petioles 

 with dilated stipule-like base. Peduncles solitary, opposite the leaves. 

 Akenes not margined. (Gk. batrachos = a frog ; on account of the 

 aquatic habitat.) 



A. Leaves mostly submerged; styles not longer than the ovary. W. C. E. 



B. aquatile (DITCH CROWFOOT) 

 AA. Leaves nearly all floating; styles about 3 times as long as the ovary. W. 



B. lobbii 



