466 



JUNCACEAE. 



VOL. I. 



Leaf-blade terete, channeled along the upper side. 



Lowest leaf of inflorescence not four lengths of the panicle ; capsule oblong to obovoid. 

 Seed tailed. 



Capsule as long as the perianth or longer. 15. /. I'aseyi. 



Capsule much shorter than the perianth. 16. /. oronensis. 



Seed not tailed. 



Perianth iJ4"-i/4" long, plainly exceeded by the capsule. 

 Perianth i%"-2" long, not exceeded by the capsule. 

 Lowest leaf of the inflorescence rarely less than four times as 



capsule globose-ovoid. 



** Flowers not bracteolate, in true heads on branches of the inflorescence. 

 Stem erect ; capsule oblong or obovoid, obtuse at the apex. 

 Stamens 3, with red-brown anthers ; capsule not mucronate. 

 Inner perianth-parts obtuse or mucronate. 



Heads few, commonly s-io-flowered. 20. 



Heads numerous, commonly 2-s-flowered. 21. 



Inner perianth parts setiform-acnminate. 22. 



Stamens 6, with yellow anthers ; capsule mucronate. 23. 



Stem creeping, floating, or ascending ; capsule subulate. 24. 



17. /. Grecnei. 



18. /. diclwtoinus. 

 long as the panicle ; 



19. /. setacens. 

 GRAMINIFOLII. 



/. marginatus. 



/. aristulatns. 

 J. sctosns. 

 /. longistylis. 

 /. repcns. 



2. LEAF-BLADE 

 WITH SEPTA. 



NOT TRANSVERSELY FLATTENED, COMMONLY TERETE, HOLLOW, PROVIDED 



* Leaf-blade usually channeled along the upper side ; septa usually imperfect, not externally evident; 



inflorescence of 1-4 heads; plants of arctic or alpine range. ALPINI. 

 Body of the seed Y 2 " in length or more. 



25 

 26 



7. castanciis. 

 /. stygius. 



Lowest leaf 

 apex. 



of inflorescence membranous, 



Leaf-sheath not auriculate. 

 Leaf-sheath auriculate. 

 Body of the seed less than J4" in length. 



Lowest leaf of inflorescence foliose, erect ; capsule deeply retuse at apex. 



27. /. biglumis. 

 spreading ; capsule obtuse and mucronate at the 



28. J. trigluniis. 



** Leaf-blade not channeled along the upper side (except in /. bulbosits), the septa perfect (except 

 in /. polycephalns), and usually externally evident; inflorescence, except in depauperate 

 specimens, of several to many heads ; plants not of arctic-alpine range. SETTATI. 



t Stamens 6, one opposite each perianth-part. 



Heads reduced to one, or rarely two flowers. 



Plant erect; flowers several-many, paniculate. 29. /. pclocarpus. 



Plant creeping or floating; flowers i or 2, peduncled or sessile. 30. /. subtilis. 



Heads 2-many-flowered. 



Epidermis not roughened. 



Plants with two kinds of leaves, one normal, the other basal, submersed, and capillary. 

 Plant low, less than 10' high. 31. /. bnlbosus. 



Plant tall, more than 10' high. 32. /. militaris. 



Plants without submersed capillary leaves. 



Capsule oblong, either abruptly acuminate or bluntly acute. 



Branches widely spreading ; capsule sharply acute, tapering into a conspicuous point. 



33. 7. articulatus. 

 Branches usually strict ; capsule broadly acute, or obtuse, with a short point. 



34. /. alp in us. 

 Capsule subulate. 



Leaf-blades erect ; inner perianth-parts longer than the outer. 35. J. nodosns. 

 Leaf-blades abruptly divergent from the stem ; outer perianth-parts longer than the 



inner. 36. /. Torrcyi. 



Epidermis of the leaves roughened with minute tubercles. 37. 7. cacsaricnsis. 







tt Stamens 3, none opposite the inner perianth-parts. 



Capsule less than three-fourths as long as the perianth. 38. /. brachycarpus. 



Capsule more than three-fourths as long as the perianth. 

 Capsule tapering evenly into a prominent subulate beak. 



Leaf-blade vertically flattened and with incomplete septa, only rarely compressed and with 



complete septa. 39. /. polycephalns. 



Leaf-blade terete or nearly so, the septa complete. 40. /. scirpoides. 



Capsule obtuse to acute at the apex, sometimes mucronate, but not prolonged into a beak. 

 Seed J4"-i" long. 



Perianth about i" long, the fruiting head not more than 2" high. 41. /. brachycephalus. 



Perianth i l / 2 "-2" long, or if shorter, the fruiting head 2" high or more. 



canadcnsis. 

 brevicandatits. 



Inflorescence broad ; capsule about as long as the perianth. 42. J . 



Inflorescence narrow ; capsule much longer than the perianth. 43. J . 

 Seed r-i" long. 



Perianth and mature capsule i"-2" long. 



Perianth i I 4"-2" long, or if less the whole plant not 20' high. 



Perianth equaling or longer than the capsule ; heads several-many-flowered. 



44. 7. acuminatus, 



Perianth shorter than the capsule ; heads 2-7-flowered. 45. 7. dcbilis. 



Perianth \"-\\" long, the whole plant more than 20' high. 46. 7. nodatns. 

 Perianth and mature capsules 2" -3" long. 47. 7. diffnsissiinus. 



