Holm — Studies in the Cyperaceoe. 305 



plants, should be considered sufficient to unite these supposed 

 species is more than probable. There seems always, even in 

 closely related species, to be at least a few distinct anatomical 

 characters to be observed, which in connection with similar 

 morphological ones may prove the species to be valid ; but we 

 have, so far, been unable to trace any such divergences as war- 

 rant the separation of Dichromena latifolia Baldw. from D. 

 leucocephala Vahl. 



"Washington, D. 0., February, 1897. 



Bibliography. 



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Am. Jour. Sci.— Fourth Series, Vol. IV, No. 22.— Oct., 1897. 

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