178 Rhodora [SEPTEMBER 
Near the head of tide in the Kennebec River, however, in Gardi- 
ner, there appears another Bidens, which has not been found in the 
lower part of the estuary. The foliage of this plant resembles that of 
B. Eatoni, var. kennebecensis, from which it differs conspicuously in 
its broadly campanulate involucres and shorter and broader achenes. 
Its affinities seem to lie rather with B. heterodoxa of the Gulf of St. 
Lawrence region and southern Connecticut. This variety is inter- 
mediate in its characters between var. monardaefolia of Pocotapaug 
Lake, Connecticut, and var. orthodoxa of the Magdalen Islands, 
Quebec. From the former it may be distinguished by its much shorter 
involucral bracts, its smaller fruiting heads, and its consistently 
retrorsely barbed achenes. From the latter it differs in its strictly 
two-awned achenes, retrorsely barbed along the margins, and its 
rarely divided leaves. 
BIDENS HETERODOXA (Fernald) Fernald & St. John, var. interstes, 
var. nov., planta 2-3 dm. alta; foliis simplicibus vel rare nonnihil 
3-partitis grosse serratis petiolatis, petiolis anguste alatis 1-3 cm. 
longis; capitulis terminalibus 1-1.3 em. latis; bracteis exterioribus 
erectis 1.3-2 cm. longis; achaeniis 5.7-7 X 1.8-2.2 mm. strigosis 
marginibus retrorse setosis, aristis 2 retrorse setosis. 
Plant 2-3 dm. tall: leaves simple or rarely somewhat 3-cleft, 
coarsely serrate, on narrowly winged petioles 1-3 em. long: terminal 
heads 1-1.3 em. wide: outer involucral bracts ascending, 1.3-2 em. 
long: achenes 5.7-7.0 X 1.8-2.2 mm., strigose, retrorsely barbed on 
the margins; awns 2, retrorsely barbed.—MarNE: at high-tide level 
along the shores of the Kennebec River, 14 mile below Gardiner, 
Sept. 18, 1923, N. C. Fassett, no. 852 (rev& in Gray Herb.); tidal 
shores, Kennebec River, Hatchs Corners, Dresden, Sept. 9, 1924, N. 
C. Fassett, no. 2101. 
GRADUATE SCHOOL OF ARTS AND SCIENCES, HARVARD UNIVERSITY. 
FLOWERING DATES FOR AMELANCHIER BARTRAMIANA— After 
considerable experience in collecting other species of Amelanchier 
in blossom, I began to think it would be necessary to climb a moun- 
tain some spring in order to find A. Bartramiana in the right condition. 
It was accordingly a pleasant surprise to me, when driving through 
Warren, New Hampshire, May 22, 1923, to spy over in the swamp a 
bush of this characteristic species with white star-like flowers, quite 
different from A. laevis, which was everywhere in the woods and by 
the roadsides. 
