192 Rhodora [NOVEMBER 
described by Ruprecht as 4. pedatum, var. aleuticum?  Ruprecht's 
material was from Unalaschka and Kadiak Island, and specimens 
from that region are clearly identica] with those from Mt. Albert. 
Occasional specimens from northwestern America and some from 
eastern Asia show very evident transitions to typical 4. pedatum, 
and, although he failed in his diagnosis to point out some leading 
characteristics of the fern, it is probable that Ruprecht's treatment 
of the plant was best and that it should be known as Adiantum 
pedatum L., var. aleuticum Ruprecht. 
Gray HERBARIUM. 
RECENTLY RECOGNIZED SPECIES OF CRATAEGUS 
IN EASTERN CANADA AND NEW ENGLAND, — VI. 
C. S. SARGENT. 
(Continued from page 185.) 
PUNCTATAE. 
Stamens 20; anthers pale rose. 
Crataegus umbratilis, n. sp. Leaves obovate to rhombic or sub- 
orbicular, acute or short-pointed and acuminate at the apex, gradually 
narrowed and concave-cuneate at the long entire base, sharply doubly 
serrate above, with straight glandular teeth, and divided above the 
middle into 3 or 4 pairs of short broad acute lobes, about half-grown 
when the flowers open at the end of May and then membranaceous, 
glabrous with the exception of a few pale hairs along the upper side 
of the midribs and veins, light yellow-green, smooth and lustrous 
above and pale below, and at maturity thin, glabrous, dark yellow- 
green and lustrous on the upper and paler on the lower surface, 6-7 
cm. long and 5-7 cm. wide, with thin orange-colored midribs, and 
slender inconspicuous primary veins extending obliquely to the points 
of the lobes; petioles slender, broadly wing-margined at the apex, 
deeply grooved, glabrous, glandular, with occasional scattered per- 
sistent glands, 2-3 cm. in length; leaves on vigorous shoots more 
1 Ruprecht, Distrib. Crypt. Vasc. in Imp. Ross. 49 (1845). 
