24 



Var. hyalina, Boott. 



Var. australis, Bailey. 



Var. mirabilis, Tuckm. (Sometimes greenishY 



Var. aperta, Boott. 



Var. maxima, Bailey. 



Var. i.nvisa, W. Boott. 



B.- — Heads ttsually greenish, 



Var. alata, Bailey. 



Var. cumulata, Bailey. 



Vaf. foenea, Torr. 



Var. mixta, Bailey. 



This arrangement omits two of the catalogued varieties, as 



they appear to merit specific distinction : 



32. — Carex SILICEA, Olney, Proc. Amer. Acad. Arts and Sci. 



vii. 393 (1868), V. s; Exsicc. fasc. i. No. 13 (1871). 



C, stramiiiea, var. moniliformis, Tuckm. Enum. Meth. 17 

 (1843); Bailey, Proc. Amer. Acad. Arts and Sci. xxiL 

 151 (1886). 

 The essential characters of this plant appear to be constant, 

 and its strictly maritime habitat gives it an additional value. 



V 33. — Carex straminiformis. 



C. stramijiea.vd^v. congesta, Boott, v, s.; Olney, Proc. Amer. 



Acad. Arts and Sci. vii. 393 (1B68); Exsicc. fasc, ii. 

 No. 20 (1871), v. s. 



Aside from the dense head, in which the individuality of the 



spikes is more or less lost, and various minor characters, this 



plant differs from C, straniinea as follows : Root dense and tough; 

 lower portion of the culm clothed with many loose and leafless 

 dry sheaths ; leaves more numerous, much broader, thick and 

 coriaceous, apparently nearly evergreen ; lowest spike subtended 

 by abroad and short scale-like bract; perigynium nerveless or 

 nearly so, conspicuously margined, light colored and much broader 

 than the lance-ovate, brown and sharp-pointed scale. (282a). 

 California, Oregon and Washington, 



34.— Carex aDUSTA, Boott, Hook. Fl. Bor.-Am. ii. 214 (1840) ; 



111. t 379. 



C, alboltitescejiSy Schw., var. glometata^ Olney, Exsicc. fasc. 

 V. No. 10 (1871), V. s. 



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