RANUNCULACEAE. 157 



Akenes hispid on the faces. R. bongardi. 

 Akenes smooth. R. bongardi douglasii. 



Beaks of the akenes not hooked 



at the tip. 



Akenes long beaked. R. orthorhynchus. 



Akenes short beaked. 



Plants decumbent, creep- 

 ing by stolons; petals 

 showy. R. repens. 



Plants erect or ascending, 



not stoloniferous. 

 Head of akenes oblong; 

 petals not longer 

 than the sepals. R. pennsylvanicus. 



Head of akenes glo- 

 bose; petals longer 

 than the sepals. R. oreganus. 



Ranunculus purshii Richards. Aquatic and glabrous or more commonly 

 terrestrial on muddy banks, and then pubescent; leaves orbicular, palmately 

 3-cleft, the segments 2-5-lobed; petals yellow, 4-5 mm. long, scarcely longer 

 than the sepals; akenes without distinct border, tipped with a short straight 

 beak. 



Rare in our limits. 



Ranunculus cymbalaria saximontanus Fernald. Perennial, nearly glabrous; 

 leaves clustered at the base and at the joints of the long slender stolons, 

 ovate or ovate-cordate, coarsely crenate, thick, the petioles often pilose; 

 scapes 1-7-flowered, 3-15 cm. high, commonly pilose; petals 5-8, pale 

 yellow, 4-9 mm. long, exceeding the sepals; heads of akenes oblong, 6-12 mm. 

 long. 



Moist soil especially where saline. 



Ranunculus flammula unalaschensis (Bess.) Ledeb. Stems slender, creep- 

 ing, rooting at the lower joints, 15-30 cm. long; leaves narrowly-lanceolate, 

 short-petioled, acute at each end, 2-5 cm. long, shorter than the internodes; 

 flowers small, yellow, mostly solitary on the ascending tips of the stems; akene 

 small, smooth, short-beaked. 



Gravelly borders of lakes and streams, common. 



Ranunculus flammula reptans (L.) Schlecht. Stems very slender, rooting 

 at all the joints; leaves linear to linear-spatulate, 10-25 mm. long. 



Gravelly or sandy shores of lakes and streams, especially in the mountains 

 at low altitudes. 



Ranunculus alismaefolius Geyer. Glabrous throughout, rather stout, 

 40-60 cm. tall, branched above; radical leaves long-petioled, lanceolate or 

 ovate, obtuse, usually cuneate at the base, entire or obscurely denticulate, 

 5-10 cm. long; cauline leaves narrower, mostly sessile; peduncles elongated; 

 sepals small; petals yellow, cuneate-obovate, strongly-nerved, 8 mm. long; 

 akenes turgid, smooth, short-beaked. 



In wet places, Willamette Valley. Our plant is not typical of the species 

 and may be distinct, possibly referrable to R. samolifolius Greene. 



Ranunculus alismellus (Gray) Greene. Glabrous, 15-25 cm. high; stems 

 solitary or few from a fascicle of fibrous roots, erect or nearly so; basal leaves 

 lanceolate or oblong-lanceolate, entire, petioled, 2-5 cm. long, the cauline 

 smaller; peduncles slender, axillary, longer than the subtending leaves; flowers 

 yellow, small, 8-15 mm. broad; petals 5 or 6, obovate; akenes thick, short- 

 beaked, numerous in a globose cluster. 



