Bjckxell : Ferns and flowering plants of Nantucket 479 



Dulichium arundinaceum (L.) Britton. 



Fresh-water ponds and wet swamps ; very common. 



* Eleocharis obtusa Schultes. 



Uncommon or rare and met with at only four stations : Cato's 

 Pond ; roadside west of the town ; Pocomo ; pool by state road 

 near 'Sconset. It appears to come into flower on Nantucket later 

 than its normal flowering time in the same latitude. In 1889, 

 '904, and 1907, its most advanced heads were perfectly fresh at 

 the middle of September; in 1906, when observations did not 

 extend beyond the middle of August, it was not seen at all. 



Eleocharis palustris (L.) R. & S. 



Common in the muddy borders of ponds and pools. Just in 

 'er June 7 ; spikes dried after the middle of August. 



flow 



Eleocharis glaucescens Willd. 



Jn wet sand about the borders of Madequecham and Nobadeer 



Pond 



s on the south shore and Capaum Pond on the north shore, 

 aso m an overflowed muddy place in Quaise. In full flower 



June 



J S ; in flower and fruit Sept. 2, 1904. 



*n wet sand the culms are extremely slender, even capillary, 



°metimes spreading or almost prostrate and only 5-15 cm. long ; 



^ater or wet mud it becomes stouter, strictly erect, and sometimes 

 5° cm. tall. 



Although this plant has received only scant recognition in our 



flora 



°n in restoring it to specific rank. 



palustris, I have littl 



e 



-— ~«-w« nig it hj op^v^iiiv. icinrv. 



n £. palustris, the narrowly ovoid, usually tapering spikelets 



l0 ~" 20 mm. long and arise between two opposite scales which 



^niinate and are continuous with the culm ; in E. glaucescens, 



ere is only one such scale and the smaller ovoid spikelets, 3-10 



m. long, receiving therefore unequal lateral support at the base, are 



Pikel 



s 



sll ghtly oblique or may be easily deflected ; the scales of the 



e t are looser and 1 



/■ 



(• - * UUJ >-1 ttlJU 1CSS JiUIIICIUUS Weill Hi ^.^""^'"i" — - 



We r rows, broader and more concave, much deeper and brighter 

 Ve Urp lsh brown in color, and usually quite without the green mid- 

 a ^° ften so conspicuous in the spikelets of E. palustris. The 

 " e . of & glaucescens is usually slightly larger than in /:'. 

 " Stns > "^withstanding the smaller size of the plant, with slightly 



ache 



