78 JUNCACEAE 



B. Leaf-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 rarelj- 2 flowers. 12. J. peloca7-piis. 



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. articulatiis. 

 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. brachycepJialus. 



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. acuviinatus. 



1. Juncus efifusus L. Co.mmox Rush. Bog Rush. (Man. p. 246 ; I. 

 F. f. gig-) Nearly throughout N. Am., except the high northern portions. 

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

 Monroe; Schuvlkii^l ; C.\rbon; Lancaster; Franki^in ; Bucks; 

 Erie ; Jefferson ; Delaware ; Alleghen'a'. 



2. Juncus filiformis L. Thre.\d Rush. (Man. p. 247 ; I. F./. g2i.) 

 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, 

 Long Pond. 



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

 247 ; I. F.y". g22. ) Pa. and Fla. — Pennsylvania : Schuylkill, Broad Mt. 



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

 9^j.) 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. /. g26.) 

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

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

 sides. — Pennsylvania : Monroe ; North.\mpton ; Lancaster ; Erie ; 

 Pike ; Chester ; Delaware. 



