468 TRANS. OF THE ACAD. OP SCIENCE. 



teretibus rigidis strictis ; capitulis paucioribus minoribus in 

 panioulam strictarn dispositis; staminibus sepala fere asquan- 

 tibus, antheris lineari-oblongis filamento pluries (quater seu 

 ultra) brevioribus ; capsula calyci requilonga seu rarius exser- 

 ta; seminibus minoribus. — J. scirpoides, Chap. 494 in part. 



a. macrostylus : sepalis requalibus seu sa3pius exterioribus 

 brevioribus ; stylo elongato, capsula plerumque lageniformi. — 

 J. macrostemon, Gay, in La Harpe, 140. 



b. br achy stylus : sepalis sequalibus seu plerumque exteriori- 

 bus, longioribus, stylo perbrevi. — J. echinatus, Muhl. Gram. 

 207 ? /. scirpoides, Lamarck in Herb.! Gray, Man. ed. 2, 481. 



Var. & echinatus: caulibus (l-J-3-pedalibus) foliisque tere- 

 tibus rigidis strictis ; capitulis paucioribus majoribus in pani- 

 culam simplicem dispositis; sepalis exterioribus plerumque 

 longioribus stamina dimidia seu tertia parte superantibus ; 

 antheris filamento (duplo triplove) brevioribus; stylis abbre- 

 viates; capsula sepalis sequilonga seu rarius exserta; seminibus 

 minoribus. — J. echinatus, Ell. Sk. 1, 410; J. megacephalus, 

 Curtis, in Bost. Jour. N. H. 1, 132 ; J. polycephalus, a. La 

 Harpe, 140; J. scirpoides, Chap. 1. c. in part. 



Var. y. polycephalus: caulibus (2-4-pedalibus) compressis 

 erectis seu flaccidis hinc decumbentibus ; foliis a latere com- 

 pressis gladiatis; panicula effusa decomposita et ultra; capi- 

 tulis majoribus; stylis abbreviatis; capsula exserta. — J. poly- 

 cephalus, Ell. 1,409; Chapm. 494; J.'polycephalus, a. Michx. 

 1. c; Pursh, 1. c; Mey. June. 33 ; J. polycephalus, y. La Harpe, 

 140. 



A. minor: caulibus capitulisque paulo minoribus; sepalis 

 requalibus trinerviis ; antheris filamentum fere aequantibus ; 

 seminibus majoribus fusiformibus. 



b. major: caulibus eapitulisque majoribus sepalis uninerviis 

 exterioribus interiora tenuia superantibus ; antheris filamento 

 brevioribus ; seminibus obovatis abrupte apiculatis. 



A southern species, which extends northeastward as far as 

 Pennsylvania and New Jersey. Var. a. a. I have only seen 

 from South Carolina, Hb. n. 67 (the form with lobed heads), 

 to Florida, Alabama and Texas ; a. b. is distributed over the 

 whole range of the species, from New Jersey and Pennsyl- 

 vania, Hb. n. 65, to South Carolina, Hb. n. 66, Arkansas and 

 Texas. Var. ft. has been found from Maryland to Florida, 

 Hb. n. 68 and Texas; Var. y. a. from North Carolina to 

 Florida, Hb. n. 69, and var. y. b. from the same States west- 

 ward to Louisiana, Arkansas and Texas. There must be 

 some error in La Harpe's statement that La Pylaie found J. 

 macrostemon in Newfoundland ; perhaps he took the large- 

 headed form of J. nodosus for it. — It flowers, according to lat- 

 itude, from June to August. 



I comprise under the name of J. scirpoides a number of 

 forms, several of which have often been taken for distinct 



