. Bulletin (Pennsylvania Department of Forestry), no. 11. Forests and forestry. 166 COMMON PAPAW Asimina triloba, Dunal FAMILY AND OENTTS DESCRIPTION—The Custard Apple family, Anonaceae, comprises about 46 genera with 600 spccits conflned mostly to the tropics. Only a few species are found in temperature regions. This family produces little that is of real economic importance. Only 2 genera, Asimina and Anona. are represented by tree species in the United States. The genus Asimina does not have representatives outside of North America, where about 8 species are known to occur. The sole represe
. Bulletin (Pennsylvania Department of Forestry), no. 11. Forests and forestry. 166 COMMON PAPAW Asimina triloba, Dunal FAMILY AND OENTTS DESCRIPTION—The Custard Apple family, Anonaceae, comprises about 46 genera with 600 spccits conflned mostly to the tropics. Only a few species are found in temperature regions. This family produces little that is of real economic importance. Only 2 genera, Asimina and Anona. are represented by tree species in the United States. The genus Asimina does not have representatives outside of North America, where about 8 species are known to occur. The sole representative of this family native to this State is the species de- scribed on this page. FORM—A small tree usually 10-40 ft. in height with a diameter up to 12 inches. Trunk short and slender. Crown rather broad, high, and formed by straight rather spreading lateral branches. BARK—^Thln, close, sometimes slightly fissured, dark brown, often covered with scattered white blotches. TWIGS—Round, olive-brown, enlarged at the nodes, rather slender, at first often somewhat hairy towards apex; later smooth, covered with a few fine lenticels which become evident dur- ing second year; pith small and white. BUDS—Alternate, 2-ranked or sometimes 3-ranked, brown, naked, hairy. Terminal, lateral leaf and flower bnda differ in size and form. Terminal bud is much longer than the others and evidently flattened. Lateral leaf-buds about i of an Inch long, closely appressed to twig and located In notch on upper surface of leaf-scars. Flower-buds occur along the twig, spherical In outline, about 1/6 of an inch in diameter, very hairy and dark brown; do not stand quite parallel to twig. LEAVES—Alternate, simple, obovate-lanceolate, 4-12 Inches long, thin, pointed at apex, tapering at base, entire on margin, when mature dark green above and paler below. In au- tumn they turn rusty yellow. LEAF-SOARS—^Alternate, located on enlarged projections of the twig. Inclined at about an angle of 35 de
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