2 Bicknell: Ferns and flowering plants of Nantucket 



ally, as destitute of any purplish tinge as the palest-flowered ex- 

 amples of A. triphylhitn. The essential points of distinction in A. 

 pusillum^ in addition to such variable differences as smaller size 

 and more slender habit, narrower leaf-segments, deeper-colored 

 and more narrowly lanceolate spathe, which is less decurved for- 

 ward and with relatively narrower and longer tubular portion, is 

 the slender, non-clavate spadix and brighter green color of the 

 leaves which are more shining on the lower surface and never be- 

 come distinctly pale or glaucous- whitened beneath as in A, tri- 

 phyllum. 



The largest example of A. piisillum found on Nantucket had 

 the stem 1.5 cm. thick at the base and measured 32 inches to the 

 tip of the longest leaf. 



Arisaema triphyllum does not appear to occur on the island. 



AcoRus Calamus L. 



Wet meadows, pools, and overflowed muddy places, common. 

 Spadices nearly full size June 7, 



LEMNACEAE 



Lemna minor L. 



Miacomet ponds : ditches west of the 



town ; Millbrook Swamp. 



Lemna trisulca L. 



Common with the preceding in Long Pond and with it also \w 

 ditches west of the town. 



XYRIDACEAE 



Xyris flexuosa MuhL 



Rather common in sandy bogs and along pond shores ; 

 Maxcy's Pond ; Shawkemo ; Polpis ; Watt's Run ; Tom Never's 

 Pond, Flowering through August and September, sometimes 

 when less than 5 cm. high. 



This small state of the plant was doubtless the basis of the 

 record in Mrs, Ovven*s catalogue of Xyris flexuosa var. piisilla A. 

 Gray {X, monfana H. Ries). This species would scarcely be ex- 

 pected on Nantucket and careful search seems to show that it 

 does not occur there. 



