PIPER FLORA OF THE STATE OF WASHINGTON, 271 



Plants terrcstial but often growing in very wet places; leaves 

 never finely dissected. 



Akenes thin-walled, the faces nerved; leaves crenate; plant 



spreading by runners '. 22. R. ci/niJialarin. 



Akenes not thin-walled nor nerved. 

 Leaves entire or nearly so. 



Stems creeping, rooting from the nodes. 



Leaves lanceolate, 2 to 5 cm. long 3. R. ilamim/ld nnnhiscJi- 



ensis. 



Leaves linear-spatulate, ^ to 2 cm. long 3a. R. farninida reptans. 



Stems erect, not rooting from the nodes. 



Plants 30 to 60 cm. high ; leaves lanceolate or 



oblong 4. R. aJi'^maefoKua. 



Plants 10 to 25 cm. high. 



Leaves oblong-lanceolate 4ii. R. aUsiuaefolius alis- 



melbts. 



Leaves cordate or subcordate 6. i?. popiilago. 



Leaves or some of them lobed or divided. 



Facesof the akenes scabrous ormuriculate ; amuials. 



Pubescent; akenes hispid with hooked hairs. . 20. R. liehrcarpux. 



Nearly glabrous; akenes minutely spiny '2\. R. muriaitus. 



Faces of the akenes smooth or merely pilose; 

 mostly perennials. 



Herbage glabrous or nearly so; low species. 

 Basal leaves 2 to 4 toothed or lobed, rarely 



entire; cauline 3-cleft or 3-parted 1 . R. (jlaherrinms. 



Basal and cauline leaves all divided. 



Annual; leaves 3 to .5-lobcd or parted, the 

 lobes crenately incised or cleft ; akenes 



apiculate 9. /2. sciieratus. 



Perennials. 



Leaves triternately divided, the seg- 

 ments linear or linear-spatulate. ... 8. R. trlternatus. 

 Leaves roundish in outline 3 to .'i-cleft 

 into cuneate divisions; alpine 

 plants. 

 Head of akenes globose ; petals large, 



showy 10.7?. suJcsdoiJii. 



Head of akenes oblong. 



Leaves pubescent; mosth' crenate 



or lobed 5. 7?. cardlophi/llus. 



Leaves glabrous or nearly so; deep- 

 ly cleft. 

 Style straight; leaves ciliate, not 



cordate 11.7?. eschscholfzii. 



Style recurved; leaves cordate, 



not ciliate 12. 7?. verecundus. 



Herbage pubescent or hirsute; mostly tall 

 and coarse species. 

 Beaks of the akenes hooked at tip. 



Petals showy; pubescence villous 14. 7?. occulenialis. 



Petals very small, pale; pubescence 

 hii-sute. 



Akenes smooth 13. 7?. bongardii. 



Akenes hispid on the faces 13a. 7?. bongardii greenei. 



