AND SOME OF ITS ALLIES 517 



Illinois to Wyoming, in dry woods and prairies. 



Specimes examined : 



Illinois: Richmond (Vasey in Gray Herb.; type), between 

 Urbana and Centralia (Vasey), Athens (E. Hall, — June. Bor. Am. 

 Engelm. no. 21); Illinois Dr. Mead, no. 23. 



Wyoming : Grand Enchantment Creek (A. Nelson, no. 3982, 

 1897). 



Juncus interior has previously constituted the main part of the 

 so-called J. secundus of the Mississippi valley. Closer observation 

 shows however that it is quite distinct as well in structure as in 

 area of distribution. J. secundus is always a slender plant with 

 rather close sheaths, while the present species is commonly tall and 

 stout with much broader sheaths. The two species also differ in 



■ 



the larger inflorescence of the latter, with larger flowers which are 

 not secund, shorter anthers and more oblong capsule. The bracts 

 also much exceed the inflorescence, while in J. sectindits they 

 usually do not. 



* 6. Juncus Arizonicus sp. no v. 



Sparingly tufted, tall and stout (4-7 dm. high), erect and rather 

 stiff, quite pale ; culm terete or slightly compressed, coarsely 

 grooved : leaves Yi—yi the length of the culm, large, broad and 

 flat, rarely involute, sometimes lax (often 1 mm. wide) ; sheaths 

 numerous and conspicuous, nearly all blade-bearing, very 

 loose and papery, often expanded, stramineous or brownish, mar- 

 gins and rounded auricles membranous, scarcely scarious : in- 

 florescence stramineous, many-flowered, open but rather crowded 

 (4-7 cm. long), the branches erect ; bracts 2-3 foliaceous, much 

 exceeding the inflorescence ; bracteoles strongly cuspidate : flowers 

 large and rather distant : perianth large (about 5 mm. long), the 

 parts lance-subulate, rigid and very acute, nearly equal, erect or 

 appressed, rarely at all spreading : stamens about one half the 

 length of the perianth ; anthers elongated-oblong, about equaling 

 the filament: style very short: capsule rather narrow, ovate- 

 oblong, obtuse, barely apiculate, triangular above, firm in texture, 

 conspicuously shorter than the perianth ; placentae meeting at the 

 ends and nearly so at the middle : seeds oblong or ovate, irregu- 

 larly curved (.30-.37X .17-21 mm.), apiculate, marked with about 

 12-14 rows of shallow transversly oblong areoles. 



Arizona and New Mexico. 



