1903] Sargent,— Recently Recognized Specics of Crataegus 153 
Crataegus Alnorum, n. sp. Leaves acute or acuminate, sharply 
and usually doubly glandular-serrate or simply crenately serrate at 
the broad rounded or cuneate base, and divided into four or five 
pairs of small acuminate spreading lobes; coated with short lustrous 
white hairs when they unfold, nearly fully grown when the flowers 
open and then membranaceous, light yellow-green and still covered 
with hairs above and glabrous below; at maturity thin but firm, gla- 
brous, dark bluish green on the upper surface, pale blue-green on 
the lower surface, 4.5-5.5 cm. long, 3.5-4.5 cm. wide, with slender 
yellow midribs slightly impressed above and thin primary veins arch- 
ing to the points of the lobes; petioles slender, nearly terete, slightly 
wing-margined at the apex, glandular with small dark red deciduous 
glands, 1.5-3 cm. in length. Flowers 1.7 cm. in diameter on slender 
pedicels in broad thin-branched glabrous many-flowered compound 
corymbs; bracts and bractlets linear, glandular, small, mostly fallen 
before the flowers open; calyx-tube broadly obconic, the lobes 
abruptly narrowed from wide bases, slender, acuminate, entire or 
finely serrate, with occasional small gland-tipped teeth; styles 3-5, 
surrounded at the base by a narrow ring of pale tomentum. Fruit 
in gracefully drooping few or many-fruited clusters, oblong-obovate, 
bright scarlet, lustrous, about 1.2 cm. long and 8 mm. wide; calyx 
sessile, with a broad shallow cavity and reflexed appressed lobes 
often deciduous from the ripe fruit; flesh thin, yellow, dry and meally, 
nutlets 3-5, thin, acute at the narrow ends, prominently ridged on 
the back, with a high grooved ridge, about 7 mm. long. 
A slender arborescent shrub 3-5 m. in height with ascending 
branches and slender nearly straight or slightly zigzag branchlets 
marked by occasional oblong pale lenticels, dark yellow-green more or 
less tinged with red when they first appear, bright red-brown during 
their first season, becoming light or dark gray-brown in their second 
year, and only slightly armed with stout straight or somewhat curved 
bright red-brown ultimately ashy gray spines 2.5-3 cm. long. Flowers 
at the very end of May or in early June. Fruit ripens toward the 
end of September. 
MaiNE: Valley of the middle Penobscot River in.low sandy soil 
mixed with or bordering Alder thickets, Orono, M. L. Fernald, May 
and September 19or. The most common species in the region often 
covering acres of ground with many hundreds of plants. 
ARNOLD ARBORETUM. 
