Fimbristylis 



Cyperaceae 



205 



Miles 



Map 400 



Fimbristylis puberula (Michx.) Vahl 



50 



Map 401 



Fimbristylis autumnalis (UR.&S. 

 var. mucronulata (Michx) Fern. 



o 50 



Map 402 



Stenophyllus capillaris (L ) Britton 



lakes and, where such a habitat occurs, it is often found in nearly pure 

 stands over large areas. It is also found in a few marshes and along the 

 borders of some of the sloughs in Lake County. It has been reported also 

 from Newton County. 



Newf. to Que., southw. to n. N. E., N. Y., Ind., and 111. 



471. FIMBRISTYLIS Vahl 



Stigmas 2; achenes lenticular. 



Scales of spikelets, at least the lower ones, puberulent or minutely pubescent; achenes 

 slightly obovoid, truncate, about 1.5 mm long, longitudinally pitted, grayish. 



1. F. puberula. 



Scales of spikelets glabrous, glossy. (See excluded species no. 94, p. 1031) 



F. castanea. 



Stigmas 3; achenes 3-angled, colorless. 

 Umbels usually simple, sometimes compound ; spikelets ovoid ; achenes about 0.75 mm 



long. (See excluded species no. 93, p. 1031) F. autumnalis. 



Umbels mostly compound; spikelets linear; achenes about 0.5 mm long 



2. F. autumnalis var. mucronulata. 



1. Fimbristylis puberula (Michx.) Vahl. Map 400. In moist, sandy 

 soil in an interdunal flat habitat. It must be very local since I have seen it 

 only three times. 



Southern N. Y. to Fla. and La., and from Ont., Mich., Ind., and 111. to 

 Kans. and Tex. 



2. Fimbristylis autumnalis (L.) R. & S. var. mucronulata (Michx.) 

 Fern. (Rhodora 37: 398. 1935.) {Fimbristylis autumnalis of some 

 authors.) Map 401. Moist, sandy, and muddy shores of lakes, sloughs, and 

 streams and in ditches. 



This is a highly variable species both as to habit and morphological char- 

 acters. When growing in the mud or in moist sand, the plant may be short 

 and the umbels simple. When growing in its preferred habitat or among 

 vegetation it may be 8-12 inches high. The margins of the leaves may be 

 entire or rather closely serrate. The achenes may be plainly reticulated 



