PIPER FLORA OF THE STATE OF WASHINGTON. 179 



Perianth segments 3.5 to 5.5 mm. long; capsule 

 1-cellcd. 



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. coinllei. 



Perianth longer than the capsule. 

 Seeds not tailed. 



Flowers in 1 , rarely 2 or 3, large heads . 15. J. falcatus. 



Flowei-s in 3 to 20 small heads 16. J. orthophyllus. 



Seeds tailed 17. J. regelii. 



Auricles of the leaf-sheaths present; perianth parts 



smooth 18. J. lorujistylis. 



Leaves provided with distinct cross-partitions. 

 Blades of the leaves equitant. 



Heads pale, numerous; stamens 6; plant tall 28. J . oxymens. 



Heads brown or black. 



Stamens 6; heads solitary ; stemsnot 2-edged. . 29. J . niertensianus. 

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



Flowers in 2 to several dense nearly black 



heads 27. J. ensifolius. 



Plowers in many brown heads 27a. J. ensifolius major. 



Blades of the leaves cylindric or only slightly compressed. 



Stamens 3 19. J. acuminatus. 



Stamens 6. 



Capsules subulate; heads many-flowered. 



Leaf blades erect; inner perianth parts 



longer than the outer 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 ^0. J. ricliardsonianv^. 



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 : 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. J. suksdorjii. 



Slender 20 to 40 cm. high; heads 

 few; capsule as long as the 

 perianth 26. J. badius. 



