JUNCACEAE. 245 



A. Lowest leaf of the inflorescence terete, not conspicuously channeled, erect, 

 appearing: like a continuation of the stem, the inflorescence therefore appearing lat- 

 eral ; stem leaves none. 



1. Flowers bracteolate, inserted singly on the branches of the inflorescence. GENUINI. 



Perianth-parts green, or in age straw-colored. 



Perianth-parts equalling or exceeding the capsule, all acute. 



Stamens 3; leaf of the inflorescence much shorter than the stern. 

 Capsule without a distinct apical papilla. i. J. effusus. 



Capsule with a distinct apical papilla. 2. J. conglomeratus. 



Stamens 6; leaf of inflorescence about equalling the stem, or longer. 



3. J. filiformis. 

 Perianth-parts reaching only the middle of the capsule, inner obtuse. 



4. J. gymnocarpus. 

 Perianth-parts with a chestnut-brown stripe down either side of the midrib. 



5. J. Balticiis. 



2. Flowers not bracteolate, inserted in heads on the branches of the inflorescence. THA- 



LASSICI. 



Perianth-parts pale brown ; seed tailless. 6. J. Roemerianus. 



Perianth-parts green, or in age straw-colored ; seed tailed. 7. J. maritimus. 



B. Lowest leaf of the infloresence not appearing: like a continuation of the stem, 

 or if so, conspicuously channeled along: the upper side, the inflorescence usually ap- 

 pearing terminal. 



1. LEAF-BLADE TRANSVERSELY FLATTENED (INSERTED WITH ITS FLAT SURFACE 

 FACING THE STEM), OR TERETE AND CHANNELED, NOT PROVIDED WITH SEPTA. 



* Flowers bracteolate, inserted singly on the branches of the inflorescence, sometimes 



clustered or congested, but never in true heads. POIOPHYLLI. 

 Annual ; inflorescence, exclusive of its leaves, more than one-third the height of the 



plant. 8. J. bufonius. 



Perennial ; inflorescence, excluding leaves, not one-third the height of the plant. 

 Leaf-blade flat, but sometimes involute in drying. 



Inflorescence i-3-flowered; leaves with fimbriate auricles. 



9. J. trifidus. 

 Inflorescence, except in depauperate specimens, several-many-flowered ; 



leaves with entire auricles. 



Cauline leaves i or 2, rarely wanting ; perianth-parts obtuse. 



10. J. Gerardi. 

 Cauline leaves none; perianth parts acute or acuminate. 



Inflorescence usually much exceeded by its lowest leaf; flowers 

 seldom plainly secund ; perianth 3.5-5.5 mm. long, usually ex- 

 ceeding the capsule ; capsule obovoid, broadly rounded at the 

 apex, the placentae intruded half way to the axis. 



11. J. tennis. 

 Inflorescence rarely exceeded by its lowest leaf; flowers plainly 



secund on the branches; perianth 2.5-4 mm - l n gi equalling the 

 capsule ; capsule oblong, 3-sided, truncate at the apex ; placentae 

 meeting at the axis. 12. J. secundus. 



Leaf-blade terete, channeled along the upper side. 



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

 to obovoid. 



Seed tailed. 13. J. Vaseyi. 



Seed not tailed. 



Perianth 2.5-3 mm - l n g> plainly exceeded by the capsule. 



14. J. Greene /. 

 Perianth 3.5-4 mm. long, not exceeded by the capsule. 



15. J. dichotomus. 

 Lowest leaf of the inflorescence rarely less than four times as long as the 



panicle; capsule globose-ovoid. 16. J. setaceus. 



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



MINIFOLII. 



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



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



17. J. marginatus. 



Stamens 6, with yellow anthers ; capsule mucronate. 18. J. longistylis. 

 Stem creeping, floating, or ascending; capsule subulate. 19. J. repens. 



