Dulichium 



Cyperaceae 



183 



Jan. 



Feb. 



Mar. 



Apr. 



May 



June 



July 



Aug. 



Sept. 



Oct. 



Nov 



Dec 



Miles 



50 



Map 339 



Hemicarpha Drummondii Nees 



o 5o 



Map 340 



Dulichium arundinaceum (L.) Britt. 



458. DULICHIUM Pers. 



1. Dulichium arundinaceum (L.) Britt. Map. 340. Generally found in 

 sedge marshes or associated usually with some sedge on the low borders 

 of lakes, sloughs, and ponds. It is rather frequent in the lake area, be- 

 coming rare south of it because its habitat is rare in southern Indiana. 



Newf. to Wash., southw. to Fla. and Tex. 



459. CYPERUS [Tourn.] L. 



[Geise. The Indiana species of Cyperus. Amer. Midland Nat. 15 : 241- 

 291. 1934.] 



Stigmas 2; achenes lenticular, not 3-angled; spikelets flat; scales falling from the 



rachis at maturity. 



Scales of spikelets stramineous, about 2 mm long, so closely imbricated as to hide 



the achenes even in dried specimens; achenes 0.75-1 mm long, distinctly blackish, 



plump, strongly compressed, strongly obovoid, transverse wrinkles distinct, 



superficial cells oblong 1. C. flavescens. 



Scales of spikelets generally margined with reddish brown, 2-3 mm long; achenes 



lenticular, with transverse wrinkles, gray or brownish gray, mostly 1-1.4 mm 



long, superficial cells more or less quadrate. 



Exserted style branches many, usually exserted 2-4 mm; scales dull, thin, mostly 



about 2.5 mm long, rather loosely imbricated so that at least the base of the 



achene is visible in dried specimens 2. C. diandrus. 



Exserted style branches few, usually exserted 1-1.5 mm; scales lustrous, sub- 

 coriaceous, usually 2-2.4 mm long, so closely imbricated that the achenes are 



hidden 3. C. rivularis. 



Stigmas 3; achenes 3-angled. 



Scales long-acuminate at the apex, usually ending in a sharp point, the upper 

 fourth to a third of them widely spreading or recurved; plants cespitose, mostly 



3-9 cm high, fragrant when dried 4. C. inflexus. 



Scales and plants not as above. 

 Scales slightly outcurved at the apex; spikelets very flat; stamens 1. 



Plants annual, 0.5-3.5 dm high; scales ovate, 3-nerved; achenes about 1 mm long 



and half as wide 5. C. acuminatus. 



Plants perennial, 4-10 dm high; scales oblong, 1-nerved; achenes oblong, about 1 

 mm long and 0.3 mm wide 6. C. pseudovegetus. 



