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igor} NORTH AMERICAN TREES 219 
slender midribs and thin prominent primary veins; petioles 
slender, deeply grooved, wing-margined above particularly on 
vigorous shoots, glandular with minute dark glands, often dark 
red after midsummer, from 4% to ¥% in. long; stipules linear, 
glandular-serrate, fading red, % in. long, caducous. Flowers 
% to % in. in diameter, on slender elongated pedicels, in broad 
loose many-flowered very thin-branched compound corymbs; 
bracts and bractlets linear, glandular-serrate, caducous ; calyx- 
tube narrowly obconic, the lobes narrow, acuminate, elongated, 
entire or occasionally obscurely dentate; stamens usually 10, 
occasionally 11 to 13; filaments slender; anthers small, pale 
yellow; styles 3 or 4, surrounded at the base by a narrow ring 
of short pale hairs. Fruit in few-fruited drooping clusters, sub- 
globose, usually a little longer than broad, full but flattened at 
the ends, dark dull crimson, marked by occasional large dark 
lenticels, from \% to ly in. in length; calyx-tube very short 
with a broad shallow cavity, the lobes gradually narrowed from 
broad bases, closely appressed, usually persistent on the mature 
fruit ; flesh thin, yellow, dry and mealy; nutlets 3 or 4, broad, 
prominently doubly ridged on the back, about 3% in. long. 
A tree usually 25 to 30 ft. in height with a trunk a foot in 
diameter covered with dark gray-brown or nearly black bark 
broken irregularly into thick plate-like scales, ascending branches 
forming a broad open erect head and slender slightly zigzag 
branchlets marked by numerous large oblong pale lenticels, 
green more or less tinged with red when they first appear, 
orange or reddish-brown during their first season and gray or 
gray-brown during their second year, and armed with numerous 
straight slender chestnut-brown spines from I to 2 in. in length. 
Flowers about May. fo. Fruit ripens toward the end of 
September. The leaves before falling turn dull orange-color. 
Rich bottom-lands of the Mississippi river in Illinois opposite 
St. Louis. First noticed October 5, 1899, in a vacant lot in the 
city of East St. Louis by Eggert, Norton, and Sargent, and on 
May 12, 1900, collected in flower by J. B. S. Norton, and in 
October 1g00 with ripe fruit by Eggert, Norton, and Sargent. 
