PIPER—FLORA OF THE STATE OF WASHINGTON. 179 
Perianth segments 3.5 to 5.5 mm. long; capsule 
1-celled. 
Panicle loose; flowers pale green... ...... 12. J. tenuis. 
Panicle close; flowers fuscous.......-... - 13. J. occidentalis. 
Flowers not bracteolate, in true heads. 
Auricles of the leaf-sheaths wanting; perianth parts 
minutely roughened. 
Perianth shorter than the capsule; heads sev- 
eral to many, 3 to 5-flowered__.--...-.-.._ 14. J. covillei. 
Perianth longer than the capsule. 
Seeds not tailed. 
Flowers in 1, rarely 2 or 3, large heads. 15. J. falcatus. 
Flowers in 3 to 20 small heads....... 16. J. orthophyllus. 
Seeds tailed.............-.2.-2-.-.----- 17. J. regelii. 
Auricles of the leaf-sheaths present; perianth parts 
smooth ... 2.2... .2 2222222220222 -2 22-2 eee 18. J. longistylis. 
Leaves provided with distinct cross-partitions. 
Blades of the leaves equitant. 
Heads pale, numerous; stamens 6; plant tall....... 28. J. oxymeris. 
Heads brown or black. 
Stamens 6; heads solitary; stems not 2-edged.. 29. J. mertensianus. 
Stamens 3 (rarely 6); stems 2-edged. 
Flowers in 2 to several dense nearly black 
heads.....22 2222222222222 22 27. J. ensifolius. 
Flowers in many brown heads. ....... ~~. 27a. J. ensifolius major. 
Blades of the leaves cylindric or only slightly compressed. 
Stamens 3........2..2-22-2-.-.-----2-- 22-0222. 19. J. acuminatus. 
Stamens 6. 
Capsules subulate; heads many-flowered. 
Leaf blades erect; inner perianth parts 
longer than the outer........... 222... 22. J. nodosus. 
Leaf blades spreading; outer perianth parts 
longer than the inner................. 23. J. torreyi. 
Capsules not subulate. 
Heads pale, few-flowered; capsules oblong- 
lanceolate. 
Perianth segments less than 5 mm. 
long... 2... Lee eee ee ee ee eee eee 20. J. richardsonianus. 
Perianth segments over 5 mm, long. . 21. J. oreganus. 
Heads brown; capsules oblong, abruptly 
acute. 
Perianth pale brown; seeds reticu- 
lated, the longitudinal striae 20 to 
26...22222 2222 eee 24. J. columbianus. 
Perianth dark brown; seeds about 15- 
striate. 
Stout 60 to 100 cm. high; heads 
several or many; capsule 
shorter than the perianth.._.. 25. ./. suksdorfii. 
Slender 20 to 40 cm. high; heads 
few; capsule as long as the 
perianth....22222222222--.-- 26. J. badius. 
