1921] Fernald, — Expedition to Nova Scotia 147 



mate and more truncated ocreolae; long-exserted fruiting pedicels; 

 larger, always trigonous, achenes with concave faces; and distinctly 

 later flowering season. The plant seems to be a perfectly definite 

 species which should be called Polygonum robust his. 1 The shore was 

 inviting in both directions, up the west side of the lake or around the 

 southern end, and as a decision had to be made we chose the south- 

 ern end. Polypodium vulgare, here having no rocks to grow on, was 

 climbing the tree-trunks, the creeping rootstocks ascending in the 

 crevices of the bark to a height of 2 or 3 meters. Rosa palustris and 

 Smilax rotundifolia, with the variety quadraugularis, soon proved 

 to be common, as were Apios tubcrosa and Woochcardia virginica, 

 but here the Chain Fern was growing in the cobbly beach of the lake. 

 One of the Joe Pye Weeds was also frequent at the upper border of 

 the beach; not, however, the widely dispersed Canadian species, the 

 plant treated by Wiegand' 2 as Enpatorium maculatum L. and by 

 Mackenzie 3 as E. Bruneri Gray, but, as we might have predicted, 

 the coastal plain plant, heretofore known from South Carolina to 

 southerr New Hampshire, E. verticillatum of Wiegand's treatment or 

 E. purpurcum of Mackenzie's. All the Sisyrinehium gramineum, an 

 abundart plant in the cobbly shore, had quite simple scapes, thus 

 simulating S. an gust i folium, but its paler bluish flowers and its fruits 

 were clearly those of S. gramineum. The plant, however, which 

 most interested us, was an abundant Habcnariaoi the cobbly beach. 

 In aspect strongly suggesting the frequent //. flava of the northern 

 states, this plant differed in its very attenuate and narrow leaves 

 chiefly lorne toward the base, so that the flowering stem was sub- 

 scapose, and in its extremely slender and open raceme of small green- 

 ish flowers with very short bracts. Subsequently the plant was 

 found al various stations in the Tusket Valley, differing strikingly 

 from the plant which passes as H. flava in New England and thence 

 west to Minnesota and Missouri, south in the uplands to the Carolina 

 Mountains; the latter plant having the broader, more elliptic and 

 less atteiuate leaves running higher up the stem and the raceme 

 more compact and usually with much longer bracts. Detailed 



'Polygonum robustius (Small), n. comb. P. punctatum robustior[us] Small, Bull. 

 Torr. Bot CI. xxi. 477 (1894). Persicaria robustior (Small) Bicknell, Bull. Torr. 

 Bot CI. xjxvi. 455 (1909). 



2 Wiegaud, Rhodora, xxii. 64 (1920). 



3 Mackenzie, Khodcha, xxii. 165 (1920). 



