JUNCACEAE. 245 



A. Lowest leaf of the inflorescence terete, not conspicuously channeled, ere:t t 

 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 stem. 



Capsule without a distinct apical papilla. 1. J. effusus. 



Capsule with a distinct apical papilla. 2. J. conglo7neratus. 



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. Baltic its. 



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



LASSICI. 

 Perianth-parts pale brown ; seed tailless. 6. J. Roe?nerianus. 



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



B. Lowest leaf of the inf loresence 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. bu/onius. 



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

 Leaf-blade flat, but sometimes involute in drying. 



Inflorescence 1-3-flowered; leaves with fimbriate auricles. 



9. J. trifidus. 

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



leaves with entire auricles. 



Cauline leaves 1 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. tenuis. 

 Inflorescence rarely exceeded by its lowest leaf; flowers plainly 



secund on the branches; perianth 2.5-4 mm. long, 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 rnm. long, plainly exceeded by the capsule. 



14. J. Greenei. 

 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. 



