244 Cyperaceae Carex 



only on the dunes in dry sandy thickets and in open situations. In southern 

 Indiana it is found in wet crevices of limestone bluffs near the Ohio River. 



Carex eburnea retains its fruit over a longer period than any of our 

 other species due to the tendency of the perigynia to persist in the spikes 

 long after maturity. Although the fruit ripens from May to July most 

 of the plants have dropped relatively few of their perigynia, as a rule, 

 by October and frequently the old prostrate culms from the preceding 

 year will be found to have spikes in which many perigynia are still firmly 

 attached. 



Newf. to B. C, southw. to Va., Mo., and Nebr. 



19. § BICOLORES 



Pistillate scales averaging three fourths the length of the perigynia or more, reddish 

 brown, appressed; terminal spike androgynous, rarely staminate; mature per- 

 igynia white-pulverulent, elliptic-obovoid, not translucent or fleshy. .68. C. Garberi. 



Pistillate scales averaging half the length of the perigynia or less, generally pale 

 yellowish brown and cuspidate, widely spreading at maturity; terminal spike 

 staminate, rarely with a few perigynia at the base; mature perigynia golden 

 yellow or brownish, orbicular-obovoid, translucent, fleshy 69. C. aarea. 



68. Carex Garberi Fern. (Rhodora 37: 253. 1935.) (Carex bicolor of 

 recent American authors, not All. and Carex Hassei of recent authors, not 

 Bailey.) Map 491. Infrequent in the lake area (mostly in the dune 

 region) where it grows along the wet sanely edges of swales in the 

 dunes and on old lake beds, chiefly in calcareous soils. It is frequently 

 associated with Carex Crawei, C. tetanica, C. Meadii, C. viridula, and 

 C. Haleana. Apparently it was formerly more plentiful than at pres- 

 ent as collections from the Indiana dunes forty and fifty years ago 

 are much more numerous in herbaria than recent collections. At Pine, 

 where this species is closely associated with Carex tetanica, plants of 

 the latter species showing many characteristics of C. Garberi and plants 

 of C. Garberi having characteristics of C. tetanica are frequent. The gen- 

 eral aspect of such plants and the conditions under which they are found 

 are strongly suggestive of hybridization. 



Que. to Mich., Ind., and Wis.; also in Alberta and B. C. 



69. Carex aurea Nutt. Map 492. Frequent on the dunes in Lake 

 County. Its habitat is often that of Carex Garberi, on moist sandy edges 

 of swales and similar situations, but it is also frequently found in richer, 

 mucky soils such as on the border of sloughs and of low wet woods. 



Newf. to B. C, southw. to Conn., Ind., Nebr., N. Mex., and Calif. 



20. § PANfCEAE 



Culms phyllopodic; stolons deep-seated, slender, whitish; plants of open marly or 

 sandy habitats. 

 Pistillate spikes linear to linear-oblong, 3.5-4.5 mm wide; perigynia appressed or 

 ascending, 2.5-3.5 mm long, slightly excurved and tapering to the apex, very 



minutely beaked or beakless; leaf blades 2-4 mm wide; culms slender 



70. C. tetanica. 



