56 Steete Additions to the JFlora of Washington. 



*io6i. Carex costellata Britton. 



Ravine, District line, May 15, 1899; Cleveland Park region and Massa 

 chusetts avenue extended. 



1062. Carex triceps Michx. 



Besides the type, which is common, I have a form with the awns of 

 the scales much longer than the perigynia, probably C. hirsuta cutipidata 

 Dewey; the difference is very considerable. Eastern Branch region, 

 June, 1896; District line, May 28, 1897. 



*io62#. Carex Caroliniana Schwein. 



Feeder Dam, May 28, 1897; Conduit road near Cropley, May 30, 1899. 



1059. Carex gracillima Schwein. 



Glencarlyn, in overripe condition, June 6, 1898; Rock Creek above 

 Military road, May 9, 1899; also on Cabin John Run. 



1058^. Carex amphibola Steud. 

 More common in my experience than C. yrisea Wahl. 



1056. Carex pallescens L. 



Woods beyond St. Elizabeth's: scarce. 



1067. Carex laxiflora Lam. 



In my judgment the forms still covered by this name include from 

 two to five good species. It is quite impossible to regard blanda and 

 patulifolia as varieties of the same species. The soft deep green or 

 yellowish-green foliage of the former is w r holly distinct from the firm 

 glaucous or grayish-green blades of the latter, the basal portion of which 

 survives the winter as in C. platyphylla, a habit shown in a far less 

 degree by blanda. C. patulifolia further differs in its more numerous and 

 densely tufted culms, its linear spikes, and its habitat, keeping as it does 

 to the upland while blanda descends to moist flats. If this separation 

 were made, the variety divaricata would go with patulifolia, provided it 

 is not itself distinct. It differs from the latter in its larger and more 

 stipitate fruit, its narrower leaves, the smaller number of culms, and 

 the spreading habit, the culms standing at angles of about 45 degrees, 

 while those of patulifolia are erect. The range of divaricata requires 

 further observation. It is fond of wooded hillsides, the sides of ravines, 

 etc. I have collected or observed it near Eastern Branch, east of 

 Soldiers' Home, in Rock Creek Park, in the Cleveland Park region, 

 and beyond Glen Sligo. 1 have the typical laxiflora, so determined by 

 Professor Wheeler, (although the fertile spikes are dense and not at all 

 like the figure in Britton and Brown) from near Chevy Chase and from 

 the District line toward Cabin John. 



1064. Carex Careyana Torr. 

 Scarce, but found on High Island and in the woods at Seven Locks. 



1078. Carex Pennsylvanica Lam. 



Specimens from the south slope of the ridge at Four Mile Run were 

 said by Professor Wheeler to be the first true Pennsylvanica he had seen 

 from Washington. 



