1916] Knowlton,— Lists of New England Plants — XXIV 247 



upon its inclusion in the First Portland Catalogue, 1862 and 1864. 

 Mitella diphylla may I think have arisen through an erroneous iden- 

 tification of Tiarella cordifolia. We have in our herbarium a speci- 

 men of the latter collected in 1877, labelled Mitella diphylla! from a 

 point near Portland. In a hasty review of the subject I have found 

 no Maine report earlier than the first Catalogue." 



Mitella prostrata (See Fernald, Rhodora viii. 90-2, 1906). This 

 plant was collected by Michaux at "lac Champlain," evidently at 

 the Canadian end, "ad fines meridionales Canadae." A plant corre- 

 sponding to Michaux's specimen was found at New Milford, Conn., 

 by C. K. Averill and E. H. Austin (Conn. Geol. and Nat. Hist. Sur- 

 vey, Bull. No. 14, 216, 1910). Botanists who collect where M. 

 diphylla is abundant should watch for this plant, which seems closely 

 related to that species. 



The various kinds of Philadelphus are often persistent around old 

 places, but P. coronarius seems to be the only species vigorous enough 

 to spread much. 



Ribcs gracile is apparently a waif in our territory (Conn. Geol. and 

 Nat. Hist. Survey, Bull. No. 14, 217-8, 1910). R. hirtellum, 

 var. calcicola is reported only from Monhegan and Martha's Vine- 

 yard, but should be looked for elsewhere, especially along the coast. 

 There are various indefinite printed reports of R. rotundifolium from 

 western Massachusetts, but I have not succeeded in finding any 

 authentic specimens. 



Parnassia caroliniana, abundant in Aroostook County, Me., seems 

 to skip central and western Maine and New Hampshire entirely, to 

 reappear in the calcareous districts of western and southern New 

 England. 



The three calciphile species of Saxifraga, S. aizoides, S. Aizoon and 

 S. oppositifolia, are found only in the Willoughby region and Smug- 

 gler's Notch, Vermont. S. rivularis is found only on Mt. Washington, 

 and S. stellaris, var. comosa only on Mt. Ktaadn. 



Liquidambar Styraciflua is reported from Northampton, Mass., in 

 Tuckerman & Frost's Catalogue of Plants growing without cultiva- 

 tion within thirty miles of Amherst. College, 1875. No station is 

 known for it now, but the tree is so unlike others that it is hard to see 

 how botanists like Amos Eaton and Edward Tuckerman could be mis- 

 taken in the matter. I should suggest that it be searched for in the 

 strip of land between Mt. Tom and the Connecticut River, south of 

 Smith's Ferry, which has recently been annexed to the city of Holyoke. 



