76 Rhodora [APRIL 
floras a large number of identities! with the flora of southern New 
Jersey and adjacent districts, indicates that it is a positive geographic 
variety. 
It is remarkable that this variation of the awns in Bidens, known in 
America in at least six species (B. discoidea,? B. Eatoni,® B. frondosa, 
B. connata,* and B. tripartita, and in B. aristosa to be discussed below), 
should not have been noted in Europe. A somewhat detailed search 
through European treatments of Bidens has failed, at any rate, to 
reveal any mention of such a variation in Europe. It seems, therefore, 
that the Prince Edward Island variation of B. tripartita should be 
treated as an endemic variety of this species, which in its typical form 
is known in America only from the neighboring coasts of the Gaspé 
Peninsula and of the Magdalen Islands. The plant may be called 
BIDENS TRIPARTITA L., var. heterodoxa, n. var., formae typicae 
habitu statura etc. simile; foliis inferioribus mediisque 3-5-partitis, 
lobis lanceolatis argute serratis; foliis superioribus subsimplicibus vel 
simplicibus, eis ramorum simplicibus lanceolatis serratis; achaeniis 
biaristatis, margine aristisque sursum barbellatis. 
Like the typical form in habit, stature, etc.: lower and median 
leaves 3-5-parted, with lanceolate coarsely serrate lobes; the upper 
leaves subsimple or simple; those of the branches simple, lanceolate, 
serrate: achenes 2-awned; their margins and awns upwardly bar- 
bellate.— Prince Epwarp IsLaND: border of salt marsh, Bunbury, 
August 28, 1912, Fernald, Long & St. John, no. 8206 (TYPE in Gray 
Herb.), also no. 8207 (form with many undivided leaves); fresh 
spring-fed marsh, Southport, August 28, 1912, no. 8205. 
1 On the lower Androscoggin and confluent lower Kennebec waters such excessively 
localized plants (most of them known from no other area in Maino) as Lophotocarpus 
spongiosus, Eleocharis rostellata, Scirpus Smithii, var. setosus, Lilaeopsis lineata, 
Samolus floribundus, and Limosella aquatica, var. tenuifolia; near Halifax such species 
as Woodwardia virginica (in Maine unknown east of the lower Penobscot), Schizaea 
pusilla (unknown in New England), Typha angustifolia (unknown in Maine from east 
of the lower Kennebec), Salicornia mucronata (unknown in Maine from east of York 
County) and Ilex glabra (unknown in New England from east of the Boston district); 
in Cape Breton such plants as Schizaea pusilla, Lycopodium inundatum, var. Bigelovti 
and Iris prismatica (unknown between York County, Maine and Cape Breton). 
?'"T[ have observed downwardly barbed awns in Coreopsis discoidea.''— Britton, 
Bull. Torr. Bot. Cl. xx. 280 (1893). 
* B. Eatoni, var. fallar Fernald, Ruopona, v. 92 (1903). 
4“ Specimens from Ithaca, N. Y., and Ohio (Selby) as well as one in the National 
Herbarium collected by Dr. Vasey near Washington have upwardly barbed awns 
but other characters the same as in the type. At Ithaca these upwardly barbed 
plants grow over a considerable area almost to the exclusion of the normal form; 
but many transitional specimens were found in which the awns bore barbs extending 
in either direction." — Wiegand, Bull. Torr. Bot. Cl. xxvi. 415 (1899). This is B. 
connata, var. anomala Farwell, Ann. Rep. Comm. Parks and Boul., Detroit. xi. 91 
(1900). 
