Psilocarya 



CYPERACEAE 



207 



Jan. 

 Feb. 



Mar. 



Apr. 



May 



June 



July 



Aug. 



Sept. 



Oct 



Nov. 



Dec 



Miles 



50 



Map 406 



Rhynchospora alba (LJ Vahl 



Jan. 



Feb. 



Mar 



Apr. 



May 



June 



July 



Aug. 



Sept. 



Oct 



Nov. 



Dec. 



Miles 



50 



Map 407 



Rhynchospora capillacea Torr 



472. PSILOCARYA Ton. 



Tubercle short, merely capping the achene, its greatest height much less than 0.5 mm; 



achene strongly transversely wrinkled 1. P. nitens. 



Tubercle sword-shaped, more than 0.5 mm long; achene not strongly transversely 



wrinkled 2.. P. scirpoides. 



1. Psilocarya nitens (Vahl) Wood. Map 403. In sandy soil on the 

 borders of sloughs. My only specimen is one collected by Umbach on the 

 border of a slough at Dune Park, Porter County, in 1899. Evidently it is 

 very local. 



Atlantic coast from Long Island, N. Y. to Fla. and along the Gulf to Tex. 

 and along Lake Michigan in Ind. 



2. Psilocarya scirpoides Torr. Map 404. This species is local but com- 

 mon to abundant where found. It grows in wet, sandy soil in marshes and 

 on the borders of sloughs and lakes. 



Mass. to R. I. and in n. Ind. 



489. CLADIUM P. Br. 



1. Cladium mariscoides (Muhl.) Torr. (Rhodora 25: 49. 1923.) Map 



405. Rather frequent or locally common where found in the lake area in 

 shallow water and on the wet borders of lakes and in marshes and springy 

 places. It is usually found in very marly places. 



N. S. to Ont. to Sask. and Minn., southw. to Fla., Ky., and Iowa. 



492. RHYNCHOSPORA Vahl Beakrush 



Mature achenes (exclusive of tubercle) 4.5-6 mm long. 



Bristles longer than the achene 1- R- macrostachya. 



Bristles shorter than the achene 2. R. cornicalata var. interior. 



Mature achenes (exclusive of tubercle) less than 4 mm long. 



Achenes transversely wrinkled; bristles upwardly barbed 3. R. cymosa. 



Achenes smooth; bristles downwardly barbed or smooth. 



Scales of spikelets (when fresh) white or nearly so, becoming tawny with age; 



