78 JUNCACEAE 



B. lyeaf-blades either terete and not channeled or flattened or compressed, 

 with the flat surfaces not facing; the stem provided with septa. 

 Stamens 6, one opposite each sepal and petal. 

 Heads reduced to one or rarely 2 flowers. 12. /. pelocarpus. 



Heads 2-many-flowered. 

 Plants with both normal and submerged capillary leaves. 



13. J. militaris. 

 Plants destitute of capillary submerged leaves. 

 Capsule of an oblong type, abruptly acuminate or blunt-pointed. 

 Panicle-branches widely spreading : capsule narrowly acute, con- 

 spicuously tipped. 14. J. articulaius. 

 Panicle-branches mostly strict : capsule broadly acute or obtuse, 

 short-tipped. 15, J. Richardsonianus. 

 Capsule of a subulate type. 

 Petals longer than the sepals : leaf-blades erect. 



16. J. nodosus. 

 Petals shorter than the sepals : leaf -blades abruptly spreading. 



17. J. Torreyi. 

 Stamens 3, none opposite the petals. 



Capsule tapering to a prominent subulate beak. 18. J. scirpoides. 

 Capsule obtuse or merely acute at the apex, sometimes mucronulate, but 

 not beaked. 

 Seeds 0.7-2.5 mm. long, narrowed into tails at both ends. 

 Perianth about 2 mm. long; mature heads mostly less than 4 mm. 



high. 19. J. brachycephalus. 



Perianth 3-4 mm. long : mature heads mostly more than 4 mm. high. 



20. J. Canadensis. 

 Seeds 0.35-0.55 mm. long, apiculate at both ends. 



21. J . acuminattts. 



1. Juncus e&usus L. Common Rush. Bog Rush. (Man. p. 246 ; I. 

 F. f. p/p. ) Nearly throughout N. Am. , except the high northern portions. 

 Also in Eu. and Asia. — Pennsylvania : Northampton ; Chester ; 

 monrob ; schuyi,kii,i< ; carbon ; ivancaster ; franklin ; bucks ; 

 Erie ; Jefferson ; Delaware ; Allegheny. 



2. Juncus filiformis L. Thread Rush. (Man. p. 247 ; I. F./. 921.) 

 Labrador to B. C. and the mountains of Pa., also to Mich, and in the Rocky 

 Mountains to Utah and Colo. — Pennsylvania: Monroe, Naomi Pines, 

 liong Pond. 



3. Juncus g3nnnocarpus Coville. Pennsylvania Rush. (Man. p. 

 247 ; I- F-/- 922.) Pa. and "PW— Pennsylvania : Schuylkill, Broad Mt. 



4. Juncus Balticus Willd. Baltic Rush. (Man. p. 247; I. F. / 

 92J.) Lab. to Alaska, Pa., Ohio and Neb., and far south in the west- 

 ern mountains. Also in'^ Eu. and Asia. — Pennsylvania : Lancaster, 

 Dillerville Swamp ; ERIE. 



5. Juncus bufonius L. Toad Rush. (Man. p. 247; I. F. /. p^(5.) 

 A cosmopolitan species, occurring throughout N. Am. except in the ex- 

 treme north, and frequenting dried-up pools, stream-borders and dry voslA- 

 sides.— Pennsylvania : Monroe ; Northampton ; Lancaster ; Erie ; 

 Pike ; Chester ; Delaware. 



