PIPER FLORA OF THE STATE OF WASHINGTON. 179 



Perianth .sci^imcnts 3.5 to 5.5 nun. long; capsule 

 l-cello(l. 



Panicle loose; (lowers palo green 12. -/. f< niils. 



Panicle close : (lowers fuscous 13../. occ'idcutdlts. 



Flowers not bracteolate, in true heads. 



Auricles of the leaf-sheaths w.anting; j)eriantli parts 

 minutely roughened. 



Perianth shorter than the capsule; heads sev- 

 eral to many, 3 to .5-flowered 14. ,/. coriUei. 



Perianth longer than the capsule. 

 Seeds not tailed. 



Flowers in 1 , rai'ely 2 or 3, large heads . 15. J .J'ulcatus. 



Flowers in 3 to 20 small heads IG. ./. orthophijIhiK. 



Seeds tailed 17. ./. reijclli. 



Auricles of the leaf-sheaths present; perianth parts 



smooth 18. ./ . /oii'jistij/is. 



Leaves provided with distinct cross-partitions. 

 Blades of the leaves equitant. 



Heads pale, numerous; st aniens G; plant tall 28. ./. (i.njimfis:. 



Heads browii or black. 



Stamens 6; heads solitaiy; stemsnot 2-edged. . 2i). ./. iii(/i(iisianu,s. 

 Stamens 3 (rarely 6); stems 2-edged. 



Flowers in 2 to several dense nearly black 



heads. 27. ./. (n.^ifoliu.^. 



Flowers in many brown heads 27a. J. cnsifoUus majur. 



Blades of the leaves cylindric or only slightly compressed. 



Stamens 3 li). ,/. (icuiiiinatiis. 



Stamens 6. 



Capsules subulate; heads many-flowered. 



Leaf blades erect; inner perianth parts 



longer than the outer 22. ./. nodosus. 



Leaf blades spreading ; outer perianth parts 



longer than the inner 23. ./. fniTciji. 



Capsules not subulate. 



Heads pale, few-flowered; capsules oblong- 

 lanceolate. 



Perianth segments less than 5 mm. 



long 20. J. richardsonlanus. 



Perianth segments over 5 nun. long. . 21. J. oreganus. 

 Heads Ijrown; capsules ol)k)ng, abruptly 

 acute. 



Perianth pak- brown; seeds reticu- 

 lated, the longitudinal striae 20 to 



26 24. J . colunibiamis. 



Perianth dark brown; seeds about 15- 

 striate. 



Stout 60 to 100 cm. high; heads 

 several or many; capsule 



shorter than the perianth 25. ./. xulsdorfi. 



Slender 20 to 40 cm. high; heads 

 few; capsule as long as the 

 perianth 26. J. badins. 



