28 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
at the base and subelliptical in outline from those in which they were sharp 
at the base and obovate-oblong in form; but further study showed both forms of 
leaves to be occasionally found in the same specimen, so that no such specific 
or varietal distinction could be made. In all leaves, however, the peculiar pits 
in the axils of the lateral veins of the leaves occur, though in some cases they 
are scarcely visible without the aid of a lens. It is this peculiarity chiefly which 
sets apart all the true soursops (section Euannona) from other groups of the 
genus. Another peculiarity which wild soursops possess in common is the very 
glossy upper surface of the leaves, which appear to have a coating of varnish. 
This feature does not occur in the cultivated soursop (A. muricata) which, 
moreover, often has caulifloral flowers and has the well-known large, juicy, 
sweet-acidulous fruits, while the fruits of wild soursops can scarcely be called 
edible, and their flowers are never caulifloral. 
EXPLANATION OF PLATES 9, 10.—Pl. 9, photograph of leaves and unopened flower, 
together with young fruit. Taken in the field in thes Bosque de Catoche, near Caracas, 
Venezuela, February 22, 1913, by H. Pittier. Pl. 10, photograph of fruit, same source, 
Both natural size. 
Annona salzmanni A. DC. 
Anona salzmanni A. DC. Mém. Soc. Phys. Hist. Nat. Genéve 5: 197. 1832. 
Section Psammogenia. <A tree of medium height with a much branching 
crown and a thick trunk; branches rather glabrous, bearing numerous prominent 
light-brown or whitish lenticels, clothed when young with minute appressed 
ferrugineous hairs; bud scales densely ferrugineous-pilose; leaf blades obovate 
to oblong or obcordate, rounded or retuse at the apex and rounded or obtusely 
cuneate at the base with the blade abruptly decurrent on the petiole, 5 to 10 cm. 
long and 3.5 to 6 em. broad, coriaceous, glabrous or nearly so when mature, but 
with sparse fine straight whitish appressed hairs along the midrib and veins 
beneath, visible under the microscope; upper surface pale olive green (in dry 
specimens), with the midrib, nerves, and veins impressed, the latter inconspicu- 
ous; lower surface rufous or tan-colored, with the midrib prominent; lateral 
nerves (10 to 12 on each side), impressed, inconspicuous, connected by im- 
pressed reticulating veins; parenchyma (of thick adult leaves) not pellucid- 
punctate; margin entire, more or less revolute; petiole short, thick and swollen, 
5 to 7 mm. long, broadly grooved above, clothed with appressed sericeous hairs 
at first, at length glabrate; peduncles in pairs or solitary, extra-axillary, some- 
times apparently axillary when situated a short distance above a leaf axil, often 
opposite a leaf as in many other Annonaceae, clothed with fine short appressed 
ferrugineous hairs, 1-flowered, 12 to 20 mm. long, thickest at the apex, erect, 
with 1 to 3 ovate acute ferrugineous-hirtellous bracts at the base; calyx 
gamosepalous, 3-lobed, broadly cup-shaped, 2 cm. wide, clothed on the outside 
with appressed ferrugineous hairs like those of the peduncle, the lobes rounded 
or triangular, thick, obtuse at the apex, 8 to 9 mm. long and equally broad 
at the base; flower buds ovoid or subpyramidal and subtriangular in cross sec- 
tion, acutish or rounded at the apex, rufous-sericeous; petals thick, ovate, acute 
or acutish, the outer ones valvate, 25 to 29 mm. long and 18 mm. broad, rufous- 
sericeous on the outside and lined within with fine brown tomentum; inner 
petals smaller, narrowed or clawed at the base, 2 to 2.5 em. long and 1 to 1.2 
em. broad, ovoid or subrhomboid, not overlapping or imbricate, acute or acutish. 
clothed on both surfaces with fine brown tomentulum; stamens numerous, soon 
falling off, 4 mm. long, the connective expanded or capitate above the parallel 
linear pollen sacs, its surface minutely verrucose or muriculate with glossy 
points; torus convex or conoid-truncate, its surface densely clothed with minute 
