294 Rhodora [December 



very compact and small inflorescence; and more glutinous involucre, 

 with often broader bracts, the outer with dark-green summits and 

 glandular-ciliate margins. In typical S. Unuifolia the stem is freely 

 branched above, forming a loose corymb up to 4 dm. broad; the 

 leaves linear-attenuate and sharply acute, thin and inclined to be- 

 come revolute, the primary ones 4-9 cm. long, 1.5-4 mm. broad; 

 the often only slightly glutinous, though sometimes extremely gummy, 

 involucres commonly with slightly narrower bracts with less pro- 

 nounced green tips and margins only slightly ciliolate; and the rays 

 usually a little narrower. See pp. 143, 144, 170. 



Too many collections, however, show direct transitions in all these 

 characters to allow the specific separation of the Nova Scotian plant. 

 The material from Cedar Lake (nos. 22,726, 22,728, 22,729, and 

 22,739), collected by different parties at remote points on the shore, 

 has all the character of the heads of extreme var. pycnocephala; but 

 the leaves, though firm and ascending, are slenderly attenuate, the 

 primary ones 3.5-7 cm. long, and most of the material is freely branch- 

 ing and with loose corymbs. Other collections (that from Darling 

 Lake above cited, and from lakes at Kemptville), though simple or 

 subsimple, have the leaves slenderly attenuate; while a large colony 

 on dry sand at Sloane Lake, near Pleasant Valley (no. 22,748) is very 

 typical 8. tcnuifolia. Farther south, much of the pond-margin and 

 quagmire material from Cape Cod, though with the foliage of typical 

 S. tenuifolia, has heads too close to those of var. pycnocephala; while 

 the plants of the Saco valley in Maine and New Hampshire, as well 

 as some from Cape Cod, are often simple or subsimple. 



** Astir mackophyllus L., var. velutinus Burgess. Frequent 

 from Yarmouth Co. to Queens. 



A. RADULA Ait. One of the commonest plants of boggy barrens, 

 peaty swales and damp thickets. 



* A. yimixeus Lam. Digby Co.: thickets and steep wooded 

 banks of Sissiboo River, Weymouth. 



* A. vimineus, var. saxatilis Fernald. Yarmouth Co.: gravelly 

 margin of Tusket (Yaughan) Lake; cobble-beach of Butler's (Gavel- 

 ton) L., Gavelton; boggy savannah bordering St. John L., Spring- 

 haven. Digby Co.: sandy beach of Lily L., Sandy Cove. 



A. juxceus Ait. Yarmouth Co.: wet savannah bordering But- 

 ler's (Gavelton) Lake, Gavelton. 



A. loxgifolius Lam. Frequent on shores of lakes and streams. 



* A. foliaceus Lindl.; Fernald, Rhodora, xvii. 13 (1915). At 

 scattered stations in Yarmouth and Digby Cos. Flowering earlier 



