PIPER—FLORA 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. R. cymbalaria. 
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. flammula unalasch- 
ensis. 
Leaves linear-spatulate, to 2 cm. long... . - 3a. R. flammula reptans. 
Stems erect, not rooting from the nodes. 
Plants 30 to 60 cm. high; leaves lanceolate or 
oblong ......-...-----.-20------------ 4. R. alismaefolius. 
Plants 10 to 25 em. high. 
Leaves oblong-lanceolate. ........-.-.- 4a. R. alismaefolius alis- 
mellus. 
Leaves cordate or subcordate.......-.- 6. R. populago. 
Leaves or some of them lobed or divided. 
Facesof the akenes scabrous ormuriculate ; annuals. 
Pubescent; akenes hispid with hooked hairs. . 20. R. hebecarpus. 
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. BR. glaberrimus. 
Basal and cauline leaves all divided. 
Annual; leaves 3 to 5-lobed or parted, the 
lobes crenately incised or cleft; akenes 
apiculate .........-.2---2-2---.---- 9. R. sceleratus. 
Perennials. 
Leaves triternately divided, the seg- 
ments linear or linear-spatulate.... 8. R. triternatus. 
Leaves roundish in outline 3 to 5-cleft 
into cuneate divisions; alpine 
plants. 
Head of akenes globose; petals large, 
showy.....-.----------------- 10. R. suksdorfir. 
Head of akenes oblong. 
Leaves pubescent; mostly crenate 
or lobed ........--- Lee eeeeee 5. R. cardiophyllus. 
Leaves glabrous or nearly so; deep- 
ly cleft. 
Style straight; leaves ciliate, not 
cordate....-.......-.----- 11. R. eschscholtzii. 
Style recurved; leaves cordate, 
not ciliate.......22..2....- 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. R. bongardii. 
Akenes hispid on the faces.......... 13a. R. bongardvi greene. 
