﻿38 BiCKNELL : Ferns and flowering plants of Nantucket 



Glabrous, leaves dark green, thickish, obtuse or broadly acute, 

 the approximate basal lobes directed backward or even incurved, 

 broad and rounded or obtusely angled. This European bindweed 

 is said to intergrade with our native species. However this may 

 be the two plants seem to follow independent trends of develop- 

 ment that take them into a wide divergence. The flowers are 

 even more at contrast than is the foliage. The commonly white 

 corolla of the introduced species is of much thicker texture and 

 of a different form than that of our native plant, the limb less 

 expanded, the tube shorter and broader and more abruptly 

 narrowed at its insertion; also the anthers are larger and their 

 filaments broader basally and more abruptly narrowed above; 

 the peduncles are more decidedly quadrangular, even wing- 

 margined, and the bracts are larger, commonly clasping the corolla 

 for more than half its length. I have usually found it a local 

 and not at all a common plant. 

 Convolvulus americanus (Sims) Greene. 



In low thickets twining on the shrubbery, sometimes long 

 trailing on gravelly or sandy shores. Nearly glabrous to slightly 

 pubescent, the leaves attenuate or acuminate, the basal lobes 

 divergent, entire or sharply angulate. Not always well defined 

 from C. repens and apparently intergrading with it. Nevertheless 

 the two plants when developed in their proper types are strikingly 

 distinct. 

 * Convolvulus repens L. 



Very common, mainly along, brackish shores and the borders 

 of salt marshes. Just in flower June 15, 1908, June 15, 1910. 

 Typically densely white pubescent or velvety throughout, the 

 basal lobes of the leaves parallel and entire or nearly so. 

 Convolvulus arvensis L. 



Occasional along fences in the town and suburbs; Quaise. 

 Just in flower June 19, 1910, July 6, 1912, 

 CuscuTA Gronovii Willd. 



Infrequent, but found here and there throughout the length 

 of the island. The orange colored stems become noticeable by 

 the middle of June and the flowers appear late in August and 

 early in September. 



