PIPER — TLORA OF THE STATE OF WASHINGTON. 271 



Plants terrestial but often growing in very wet places ; leaves 

 never finely dissected. 



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



spreading by runners 22. K. cymhalaria. 



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. fl. fiammiila unalascJi- 



ensis. 



Leaves linear-spatulate, J to 2 cm. long 3a. R. fiammula reptans. 



Stems erect, not rooting from the nodes. 



Plants 30 to 60 cm. high; leaves lanceolate or 



oblong 4. R. alismaefolius. 



Plants 10 to 25 cm. high. 



Leaves oblong-lanceolate 4a. R. alismaefolius alis- 



mellus. 



Leaves cordate or subcordate 6. ^. populago. 



Leaves or some of them lobed or divided. 



Facesof the akenes scabrous ormuriculate ; annuals. 



Pubescent; akenes hispid with hooked haii-s. . 20. R. hebecarp^is. 



Nearly glabrous ; akenes minutely spiny 21. R. muricatus. 



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 7. R. glaberrimus. 



Basal and cauline leaves all divided. 



Annual; leaves 3 to 5-lobed or parted, the 

 lobes crenately incised or cleft ; akenes 



apiculate 9. R. sceleratus. 



Perennials. 

 Leaves triternately divided, the seg- 

 ments linear or linear-spatulate . 8. /?. triternatus. 



Leaves roundish in outline 3 to .5-cleft 

 into cuneate divisions; alpine 

 plants. ^ 



Head of akenes globose ; petals large, 



showy 10. i?. suksdorfii. 



Head of akenes oblong. 



Leaves pubescent; mostly crenate 



or lobed 5. R. cardiophyUus. 



Leaves glabrous or nearly so ; deep- 

 ly cleft. 

 Style straight ; leaves ciliate, not 



cordate 11. R. eschscholtzii. 



Style recurved; leaves cordate, 



not ciliate 12. R. verecundus. 



Herbage pubescent or hirsute ; mostly tall 

 and coarse species. 

 Beaks of the akenes hooked at tip. 



Petals showy; pubescence villous 14. R. occidentalis. 



Petals very small, pale; pubescence 

 hirsute. 



Akenes smooth 13. i2. hongardii. 



, Akenes hispid on the faces 13a. R. hongardii greenei. 



