
— 

1901] NORTH AMERICAN TREES 221 
ends, dark red, marked by a few large pale lenticels, 54 in. in 
diameter; calyx-cavity broad and shallow, the lobes serrate, 
villose, spreading and closely appressed; flesh thin and yellow ; 
nutlets 5, thick, very prominently doubly ridged on the back, 
about ¥% in. long. 
A tree from 15 to 18 ft. in height, with a trunk 6 or 8 in. 
in diameter, and stout wide-spreading branches forming a sym- 
metrical round-topped head and slender branchlets dull red and 
puberulous during their first season and dark gray-brown during 
their second year, and ‘armed with stout straight spines from 
1% to 2 in. in length. 
Flowers in May. Fruit ripens late in October. 
Rich woods, Allenton and Pacific, Missouri, George W. Letter- 
man, May and October 1882. 
This species, which was referred by Engelmann to Crataegus tomentosa 
Linnaeus, and to Crataegus punctata Jacquin, is still very imperfectly known. 
Its relationship appears to be with Crataegus collina Chapman, from which it 
differs in its more tomentose young leaves and branchlets, in its short thick- 
branched and more tomentose corymbs, ten stamens, rather larger fruit, and 
in its much later flowers. 
v Crataegus Arnoldiana, n. sp.— Leaves broadly ovate or rarely 
oval, acute at the apex, rounded, truncate or occasionally broadly 
cuneate at the base, irregularly divided above the middle into 
numerous short acute lobes, coarsely doubly glandular-serrate 
except at the base; in early spring densely villose above and 
below, and at maturity from 2 to 3 in. long and broad, membra- 
naceous, smooth, dark green and lustrous on the upper surface, 
paler on the lower surface, slightly villose on the under side 
of the slender midribs and thin remote primary veins running 
to the points of the lobes and faintly impressed above; petioles 
Slender, only slightly grooved, densely villose, ultimately 
puberulous, from 34 to 1% in. long; stipules linear, coarsely 
glandular-serrate, often I in. long, caducous. Flowers % in. 
in diameter on slender pedicels in broad loose compound 
many-flowered thin-branched tomentose cymes; bracts and 
bractlets lanceolate to oblanceolate, coarsely glandular-serrate ; 
