138 Karl M. Wiegand and Arthur J. Eames 



e. Anthers as long or twice as long as the filaments ; perianth lighter, shorter 

 than the darker subglobose or obovoid capsule ; lowest bract exceeding 

 the inflorescence. 5. /. compressus 



d. Uppermost leaf much below the middle of the stem; perianth parts sharp- 

 pointed, mostly spreading. 

 e. Auricles at summit of sheath produced into scarious lobes. 



/. Inflorescence of medium size; flowers scattered or clustered, not 



racemose. 6. J. tenuis 



f. Inflorescence many-flowered, diffuse; flowers somewhat racemose on 

 the branches ; plant taller and more strict. 6a. /. tenuis 



var. anthelatus 

 e. Auricles firm, but not cartilaginous, not produced ; basal sheaths usually 

 slightly purplish (see also 3d e). 7. J. dichotomus, 



var. platyphyllus 

 e. Auricles cartilaginous, not produced ; basal sheaths pale. 



8. /. Dudleyi 

 b. Flowers borne in heads in the cyme. 

 c. Leaves flat and grass-like. 9. /. marginatus 



c. Leaves terete, nodulose (because of cross-diaphragms). 

 d. Seeds acute or obtuse, without caudate hyaline appendages. 



e. Stamens 3 (none opposite the petals). 10. /. acuminatus 



e. Stamens 6. 

 /. Capsule strongly subulate-acuminate; heads few, large (7-15 mm. in 

 diam.), spherical; involucral bracts exceeding the cyme; rootstocks 

 creeping, often tuber-bearing. 

 g. Plant low, 1.5 — 4 (6) dm. high; leaves erect; flowers 3-4 mm. long; 



petals equaling or longer than the sepals. 11. /. nodosus 



g. Plant taller, 4-10 dm. high ; leaves spreading, more or less at right 

 angles to the stem ; flowers 4-5 mm. long ; petals much shorter than 

 the sepals ; heads very large. 12. /. Torreyi 



/. Capsule ellipsoid or ovoid, acute or obtuse; heads smaller (6 mm. in 

 diam. or less) and more numerous, hemispherical ; involucral bracts 

 shorter than the cyme ; plants subcespitose ; rootstocks short and not 

 tuber-bearing. 

 g. Capsule strongly acute ; sepals and petals acute or acutish ; branches 

 of the cyme usually divaricate; seeds with very fine scalariform 

 markings in the areoles; culms often divaricate at base and some- 

 what decumbent. 13. /. articnlatus 

 g. Capsule merely apiculate ; sepals and petals more scarious-tipped, 

 mostly obtuse; cyme usually with more ascending branches; seeds 

 smooth or very indistinctly striate in the areoles ; culms erect. 



14. /. alpinns, 



var. fuscescens 

 d. Seeds caudate. 



e. Branches of the cyme spreading; capsule slightly exceeding the perianth. 

 /. Heads 5-50-flowered, few or many ; perianth parts subulate-tipped ; 



plant tall, coarse. 15. /. canadensis 



f. Heads 3-5-flowered, very numerous in a diffuse panicle ; perianth parts 



less rigid, more obtuse and more scarious-margined ; seeds shorter and 



broader ; plant lower. 16. /. brachyccphalus 



e. Branches of the cyme ascending; capsule at least one-half longer than the 



perianth, gradually pointed. 17. /. brevicaudatus 



[J. effusus L., var. compactus Lej. & Court. (/. e., var. conglomcratus, of Cayuga 



Fl.) 

 Damp situations ; rare. 



" South side of Taughannock, and elsewhere" (D. in Cayuga Fl. and C. U. Herb.) ; 

 not seen since. The specimen is var. Pylaei. 



Newt., along and near the coast to Mass. Found also in B. C. and Eu.] 



