PIPER—FLORA OF THE STATE OF WASHINGTON, 227 
Fruiting pedicels erect. 
Stout; akenes dull... . - 11. P. ramosissimum. 
Slender; akenes smooth, 
shining......-...-.- 12. P. sawatchense. 
Fruiting pedicels reflexed. 
Flowers campanulate, 2 
to 3 mm. long... ... 13. P. douglas‘. 
Flowers — funnel-form, 
3.5 to 4.5 mm. long.. 14. P. majus. 
Flowers in interrupted, but rather 
close spikes. 
Style 3-cleft; filaments slen- 
der... 2-22-2022 -2 22 ee 15. P. spergulariaeforme. 
Style 3-parted; filaments 
dilated... ....22------- 16. P. nuttallir. 
Blades of the leaves not jointed on the pedicels. 
Segments of the ocreae rigid. .......-.----------- 17. P. greener. 
Segments of the ocreae not rigid --.-.--.---- _.... 18. P. parryi. 
Leaves comparatively large; flowers mainly terminal. 
Perennials. 
Styles 3; plants with thick roots. 
Flowers in a single dense spike-like raceme; 
styles long. 
Raceme thick not bulbiferous; akenes 
smooth..........-.-2-----------+--- 19. P. bistortoides. 
Raceme slender, often bulbiferous; akenes 
dull.....222.-2-.---.-.------------- 20. P. viviparum. 
Flowers in racemes or panicles; styles short; 
alpine plants. ; 
Racemes mainly axillary; leaves pubes- 
cent.......-.-.--------------------- 21. P. newberryi. 
Racemes panicled. 
Leaves ovate; akene ovoid.....-.--- 22. P. phytolaccaefolium. 
Leaves lanceolate; akene obovoid.... 23. P. alpinum. 
Styles 2; aquatic or swamp plants with flowers in 
spike-like racemes. 
Ocreae fringed at the spreading summit... ..--- 24. P. hartwrightii. 
Ocreae not fringed nor spreading. 
Leaves oblong-elliptic, obtuse. .....-.-- - 25. P. amphibium. 
Leaves ovate, acuminate.........-..--- 26. P. emersum. 
Annuals; flowers in several spike-like racemes. 
Styles 3-cleft; akenes 3-angled........-.--------- 27. P. hydropiperoides. 
Styles 2-cleft; akenes lenticular. 
Ocreae naked; racemes drooping. 
Akenes broad; style 2-cleft.............. 28. P. lapathifolium. 
Akenes narrow; style 2-parted........... 29. P. incarnatum. 
Ocreae bristly-ciliate. 
Calyx not glandular; raceme dense. - - ---- 30. P. persicaria. 
Calyx glandular; racemes interrupted. 
Racemes erect......--------------- 31. P. punctatum. 
Racemes drooping. ...------------- 32. P. hydroprper. 
1. Polygonum dumetorum scandens (L.) Gray, Man. ed. 5. 418. 1867. 
Polygonum scandens L. Sp. Pl. 1: 364. 1753. 
Type Locaity: “Habitat in America.” 
