146 Rhodora [May 
ends, scarlet, lustrous, 1.3—1.5 cm. long; calyx sessile, with a broad 
shallow cavity and elongated spreading lobes often deciduous from 
-the ripe fruit; flesh thin, yellow ; nutlets 3 or 4, thin acute at the 
ends, ridged on the back, with a high rounded ridge, 8 mm. long. 
An arborescent shrub sometimes 4 m. in height or often a broad 
low bush, with stout nearly straight branchlets. marked by small pale 
lenticels, dull red-brown when they first appear, rather light reddish 
brown and lustrous during their first season, dull and darker the 
following year and ultimately ashy gray, and armed with very 
stout slightly curved red-brown shining spines 2.5—4 cm. in length. 
Flowers at the end of May. Fruit ripens late in September. 
Marne: valley of the middle Penobscot River, borders of streams 
and woods, Orono, M. L. Fernald, May and September, 19or. 
Crataegus monstrata, n. sp. Glabrous with the exception of 
the short hairs on the upper side of the young leaves. Leaves ovate 
to oval, acuminate, cuneate at the entire base, sharply serrate above, 
with straight glandular teeth, and divided into 4 or 5 pairs of narrow 
acuminate lateral lobes ;- about half grown, light yellow-green and 
scabrate above and glabrous below when the flowers open, at matu- 
rity membranaceous, scabrate and yellow-green on the upper surface, 
pale on the lower surface, 5-6 cm. long, 3.5-4 cm. wide, with very 
slender nearly terete petioles 2.5—3 cm. in length ; on leading shoots 
leaves ovate, full and rounded at the broad base, often 6 cm. long 
and wide, with stout petioles slightly wing-margined above the middle 
and often conspicuously glandular. Flowers on elongated slender 
pedicels, in broad many-flowered thin-branched compound corymbs ; 
bracts and bractlets linear, small, glandular, turning red in fading, 
caducous ; calyx-tube narrowly obconic, the lobes gradually narrowed 
from the base, slender, acuminate, entire or rarely obscurely serrate, 
tipped with small red glands, reflexed after anthesis; stamens 5-7 ; 
anthers light violet color; styles usually 3. Fruit in, few-fruited 
drooping clusters, oblong, full and rounded at the ends, bright scar- 
let marked by many minute pale dots, about 4 cm. long and 9 or ro 
mm. wide; calyx small, sessile, with a broad shallow cavity, closely 
appressed entire or slightly serrate lobes; flesh thin, yellow, some- 
what juicy; nutlets 3, rounded at the ends, thin, prominently ridged 
on the back, with a broad slightly grooved ridge, 7 mm. long. 
Usually shrubby, but occasionally arborescent in habit and 3 m. in 
height, with ascending branches and slender slightly zigzag branch- 
lets, light orange-green when they first appear, dull red-brown and 
marked by occasional small pale lenticels during their first season, 
and light reddish brown or ashy gray the following year, and armed 
with many slender slightly curved red-brown ultimately gray spines 
