April, 1913.] Liliales of Ohio. 127 



8. Heads of the inflorescence 5-15, each head usually 5-10 flowered, 

 plants less than 20 in. high. /. marginatus. 



8. Heads of the inflorescence usually 20-100, each head 2-5 flowered, 



plants over 20 in. high. J. aristulatus. 



9. Glomerules loosely few-flowered, hemispherical. 10. 

 9. Glomerules densely many-flowered, spherical. 13. 



10. Stamens 6, or if 3 the glomerules only 3-7 flowered; capsule longer than 

 the perianth segments. 11. 



10. Stamens 3, glomerule 5-many flowered, capsule shorter than the 



perianth segments. /. acuminatus. 



11. Stamens 6, seeds not with caudate tips. 12. 



11. Stamens 3, seeds with caudate tips. /. hrachycephal'us. 



12. Plants articulate, sepals acuminate, flowers brownish, capsule grad- 



ually tapering to a mucronate tip. /. articitlatus. 



12. Plants not articulate, sepals blunt, often mucronate-tipped, flowers 



straw-colored, capsule acute, or obtuse with a short tip. 



J. ric hards onianus. 



13. Involucral leaf usually much exceeding the inflorescence stamens 6. 14. 



13. Involucral leaf usually shorter than the inflorescence, or if exceeding 



the inflorescence then not over one inch long, stamens 3. 15. 



14. Sepals exceeding the petals, leaf-blades abruptly divergent from the 



stem. /. torreyi. 



14. Sepals shorter than the petals, leaf-blade erect. /. nodosus. 



15. Capsule obtuse or acute at the apex, sometimes mucronate but not 



prolonged into a beak; seeds with definite caudate tips. 



/. canadensis. 

 15. Capsule tapering evenly into a prominent subulate beak; seeds blunt or 

 merely pointed, not caudate. /. scirpoides. 



1. Juncus effusus L. Common Rush. An herb with a 

 branching root-stock, lateral inflorescence and non-septate leaves. 

 Basal leaves reduced, scapes soft and pliant; inflorescence a 

 diffused, much-branched cyme; flowers small and greenish; 

 stamens 3; style short; capsule trilocular; seeds small. Marshy 

 ground. General and common. 



2. Juncus balticus Willd. Baltic Rush. Scape rigid; in- 

 florescence a lateral, loose or dense cyme; perianth parts brown 

 with a green mid-rib and hyalin margins; capsule about as long 

 as the perianth, brown mucronate, trilocular. On sandy soil. 

 Erie County. 



3. Juncus dudleyi Weig. Dudley's Rush. Inflorescence 

 a teniiinal cyme subtended by bractlets; leaves non-septate; 

 leaf -sheath covering % of the stem; auricles dark, cartilaginous 

 not conspicuously extended beyond the point of insertion; seeds 

 blunt. Montgomery, Clinton, Champaign, Licking, Delaware, 

 Tuscarawas. 



4. Juncus tenuis Willd. Slender Rush. Inflorescence ter- 

 minal, subtended by bracts; flowers subtended by bractlets; 

 sheaths covering y^ of the stem ; leaves flat, non-septate, becoming 

 involute in age; auricles scarious, conspicuously extended beyond 

 the point of insertion. Seeds blunt. General. 



