1905] Sargent, — Recently recognized Species of Crataegus 117 
broader and thicker leaves, by its much more hairy corymbs and 
calyx, by its pale yellow anthers and by the color of the flesh of the 
ripe fruit. 
* * Stamens 10. Anthers pale rose color. 
Crataegus fluviatalis, n. sp. Crataegus acutiloba, Sargent, RHO- 
DORA, lii. 76 in part, (1901). 
Leaves ovate, acuminate, broadly cuneate or rounded at the base, 
sharply and mostly doubly serrate, with straight teeth tipped with 
dark glands and divided into 5 or 6 pairs of narrow acuminate 
spreading lateral lobes; tinged with red and villose above and along 
the midribs and veins below with long pale hairs when they unfold, 
more than half grown when the flowers open and then membrana- 
ceous, coated above with short shining white hairs and glabrous 
below; at maturity thin but firm in texture, smooth and dark yellow- 
green on the upper surface, paler on the lower surface, 5-6 cm. long, 
3.5-5 cm. wide, with stout yellow midribs often becoming rose color in 
the autumn, and slender primary veins extending to the points of the 
lobes; petioles slender, grooved, slightly wing-margined at the apex, 
glandular, with numerous small dark red glands mostly deciduous 
before autumn, often rose color late in the season, r.5—-2.5 cm. in 
length ; stipules linear to linear-obovate, glandular-serrate, caducous ; 
on vigorous shoots leaves deeply lobed, with spreading acuminate 
narrow lobes, often 7-8 cm. long and 6—7 cm. wide, with short stout 
glandular petioles wing-margined below the middle. Flowers r.5 cm. 
in diameter on elongate slender densely or slightly villose pedicels, 
in broad thin-branched more or less villose many-flowered compound 
corymbs; bracts and bractlets linear, glandular, small, caducous; 
calyx-tube broadly obconic, villose toward the base, glandular above, 
the lobes narrow, elongated, acuminate, entire or slightly and irregu- 
larly serrate, villose on the inner side above the middle, reflexed after 
anthesis; stamens ro; anthers pale rose color; styles 4 or s. Fruit 
in broad many-fruited drooping glabrous or slightly villose clusters, 
oblong or rarely obovate, crimson, lustrous, marked by numerous 
small dots, 9-13 mm. long, 8-1o mm. wide; calyx sessile, with a 
broad shallow cavity, and spreading closely appressed usually entire 
lobes villose on the upper side: flesh thin, firm and yellow ; nutlets 
4 Or 5, acute at the ends, conspicuously ridged on the back, with a 
narrow rounded ridge, about 6 cm. long. 
A shrub with many slender erect stems spreading into small clus- 
ters and frequently 6 or 7 m. tall, and thin zigzag branchlets dark 
orange-green and slightly villose when they first appear, soon glabrous, 
marked by numerous oblong pale lenticels, bright red-brown and lus- 
trous during their first season, pale orange-brown and lustrous in 
