150 Rhodora [AuGusT 
nente; bracteis involucri exterioribus 4-9 linearibus vel lanceolatis 
acutis 1.5-3.5 em. longis; achaeniis exterioribus 7.5-8.5 mm. longis, 
interioribus 8.7-10 mm. longis aristis marginalibus 3.5-5 mm. longis. 
Plant erect, 3-7 dm. high, with strongly ascending branches: leaves 
thin, linear-oblanceolate, attenuate-acuminate, coarsely serrate; the 
primary 0.6-1.4 dm. long, with the midrib prominent beneath: bracts 
of the outer involucre 4-9, linear or lanceolate, acute, 1.5-3.5 cm. 
long: outer achenes 7.5-8.5 mm. long; the inner 8.7-10 mm. long, 
with marginal awns 3.5-5 mm. long.— Marne: tidal mud-flats of 
Cathance River, Bowdoinham, September 14 and 19, 1916, Fernald & 
Long, nos. 14825, 14927 (TYPE in Gray Herb.), 14828, also in Pl. Exsice. 
Gray. no. 295. 
Var. gaspensis, n. var. B. hyperborea Fernald, Ruopora, x. 202 
(1908) excluding plant of James Bay.— Estuaries of the rivers of the 
Gaspé Peninsula, Quebec. The following specimens may be cited: 
submerged at high tide, brackish shores about the mouth of Dartmouth 
River, August 26 & 27, 1904, Collins, Fernald & Pease (rype in Gray 
Herb.); brackish shore, submerged at high tide, mouth of St. John 
River, Douglastown, August 23, 1904, Fernald, Collins & Pease; 
brackish shore, submerged at high tide, alluvial islands at the mouth of 
Bonaventure River, August 4, 1904, Collins, Fernald & Pease; mate- 
rial has also been seen from the mouth of York River, Gaspé and from 
the mouth of Matane River, Matane County (coll. F. F. Forbes). 
Gray HERBARIUM. 
A NEW PEREZIA ADVENTIVE IN MASSACHUSETTS. 
J. Francis MACBRIDE. 
Durine last summer a strange daisy-like plant appeared in the 
vegetable garden of Mrs. Frank E. Lowe of North Worcester, Massa- 
chusetts. Because of its attractiveness it was allowed to grow and 
a specimen was sent to the Gray Herbarium for determination. Now 
study has disclosed the rather surprising fact that it is a species of 
Perezia seemingly undescribed and not closely related to any of the 
species in the section of the genus to which it belongs, a section which 
is represented only in South America. This group of species is at 
once distinguishable from the true Perezias of Mexico and Central 
America by the pauciseriate involucre and at one time was treated 
as a separate genus under the name Homoeanthus. The species are 
widely distributed, particularly over the sheep-grazing areas of the 
