92 Rhodora [May 
description of S. canadensis, which was originally said to have the 
heads smaller than in the subentire-leaved S. altissima and which was 
characterized “‘foliis trinerviis subserratis."' 
A detailed study of the small-headed northern plant, which was 
considered by Dr. Porter a variety of S. canadensis but which is the 
S. canadensis of the old European gardens and herbaria and very 
evidently of Linnaeus, and the larger-headed more southern plant, 
which was described by Linnaeus as S. altissima and has subsequently 
passed as a large variation of S. canadensis (var. scabra Torr. & Gray 
and much which has passed as var. procera Torr. & Gray) has con- 
vinced the writer that they are perfectly good species and that they 
are separated by several other characters besides those originally 
emphasized by Linnaeus. 8. canadensis has the stem glabrous at 
least below, though often minutely pubescent above; in S. altissima 
the stem is cinereous-puberulent. In S. canadensis the leaves are 
thin, narrowly lanceolate, glabrous above, minutely pubescent on 
the nerves beneath, and mostly sharp-serrate; in S. altissima the 
thickish leaves are lanceolate, minutely pubescent or scabrous above, 
short-pilose beneath, and subentire or only slightly toothed. The invo- 
lucre of S. canadensis is 2-2.8 mm. long, of thin greenish-straw-colored 
mostly attenuate bracts; that of S. altissima 3.2-4.5 mm. long, with 
more herbaceous and coarser bracts. S. canadensis, which abounds 
from Newfoundland and the lower St. Lawrence to North Dakota, 
extending southward throughout northern and eastern New England 
and along the mountains to West Virginia and Kentucky, is in the 
height of bloom from July to September; S. altissima occurs from 
eastern Massachusetts апа Vermont to Michigan and Kansas, ex- 
tending south to the Gulf of Mexico, and flowers from August to 
October. 
SOLIDAGO ALTISSIMA L., var. procera (Ait.), n. comb. S. procera 
Ait. Hort. Kew. iii. 211 (1789). 8. canadensis, var. procera Torr. 
& Gray, Fl. ii. 224 (1841). — ^ 
SOLIDAGO GRAMINIFOLIA (L.) Salisb., var. Nuttallii (Greene), n. 
comb. ÆEuthamia Nuttallii Greene, Pittonia, v. 73 (1902).— S. gram- 
inifolia is the common glabrous or nearly glabrous plant of eastern 
Canada and the northern states, but it passes very frequently to the 
var. Nuttallii, which has the leaves more pubescent and the branches 
of the inflorescence hirtellous. As originally defined by Professor 
Greene the more pubescent plant was assigned a known range from 
