108 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Besides the typical form, plants with much narrower leaves and smaller, somewhat 

 ascending perigynia are often found. 



3. Carex rosea Schkuhr. 



Woods and thickets; common. Latter part of May. Eastern U. S. (C. rosea 

 radi'ita Boott; C. ros»a minor of Ward's Flora.) 



A densely cespito^e form with nearly prostrate culms, lax, almost capillary leaves, 

 and extremely narrow perigynia is often found in damp, shaded places. 



4. Carex muricata L. 



Collected several times in the Mall. May 15-June 1 . Me. to Ohio and Va. ; locally 

 naturalized from Eur. 



5. Carex muhlenbergii Schkuhr. 



Sparse throughout the region. May-June. Eastern U. S. 



Nearly all the specimens collected here have the perigynia nerveless or nearly so 

 (C. muhlenbergii enervis and C. muhlenbergii xalapcnsis of Ward's Flora), but a few 

 have the perigynia more or less strongly nerved. 



6. Carex mesochorea Mackenzie. 



Apparently rare, although specimens have been collected in rather diverse locali- 

 ties; Ammendale; High Island; Dyke. May 20-June 10. D. C. to Tenn. and Kan. 



7. Carex cephalophora Muhl. 



Common throughout the Piedmont Region and extending into the Coastal Plain, 

 at least along the wooded banks of streams. May-July. Eastern U. S.» 



8. Carex leavenworthii Dewey. 



Seemingly not so common as the preceding species, but occurring throughout the 

 region in woods or meadows. May 10-June 10. Ont. to D. C, Iowa, and Tex. (C, 

 cephalophora angustifolia Boott.) 



9. Carex aggregata Mackenzie. 



Described from specimens collected in the District by Steele; not common. May 

 15-June 10. D. C. to Mo. (C. divulsa of Holm's liBt and C. gravida of Steele's list, 

 apparently.) 



10. Carex sparganioides Muhl. 



Damp woods and thickets; fairly common. May-July. Northern states, south 

 to Va. 



Recognized by the broad, soft, deep green leaves and long interrupted inflorescences. 



11. Carex conjuncta Boott. 



Collected several times at the upper end of the Potomac Flats, where the Lincoln 

 Monument now stands. Last of May and first half of June. Northern states, south 

 to D. C. 



Carex alopecoidea Tuckerm., listed by Holm, is not represented by specimens. It 

 may be distinguished from the C conjuncta by its few-nerved, distinctly stipitate 

 perigynia. 



12. Carex vulpinoidea Michx. 



Mostly in wet or swampy places and swales; common. J\me-Aug. Eastern U.S. 

 (Thit species, or the next, presumably C. mxdtifiora of Brereton's Prodromus; C. setacea 

 of Steele's list is possibly an extreme form of this.) 



The culms are more slender than those of the following species and the leaves more 

 lax, thus giving the plant a more spreading habit. 



13. Carex annectens Bicknell. 



Fields; common. June-Aug. Me. to Md. and Mo. (C. xanthocarpa Bicknell; C> 

 setacea arnbigua Fernald.) 



Somewhat coarser and stiffcr than the last. 



14. Carex decomposita Muhl. 



Borders of streams and ponds; Great Falls; Broadwater; Dyke. First week in 

 June. Eastern U. S. 



