Picture Notes: Picture 7 has Gleditsia leaflets on top of Robinia.
Picture 15 is Robinia pseudoacacia var. decaisneana.
Picture 16 is Robinia pseudoacacia cv. Umbraculifera.
Distribution: Eastern and central U.S., widely planted in temperate regions.
Hardiness Zone: USDA Zones 4 to 8 or 9 (view
USDA zone map)
Size: 30-50 ft. tall, with a spread of 20-35 ft.
Form: Deciduous tree. Upright, with a straight trunk and a narrow, oblong crown, becoming ratty-looking with age.
Bark: Bark is reddish-brown to black, deeply furrowed into a basket weave pattern, with orangish inner wood showing through. Young bark has conspicuous lenticels.
Stem/Bud: Stems are slender, zig-zag, with a pair of l/2 inch long prickles at each node. Prickles not always present on older branches.
Leaves: Leaves are alternate, pinnately compound with 7-l9 leaflets, each being elliptic, l-2 inches long, with an entire edge, dark bluish-green in color.
Fall Color: Fall color is yellow-green.
Flower: Flowers are white, l inch across, extremely fragrant, borne in dense racemes, 4-8 inches long, in late May to early June, showy.
Fruit: Fruit is a flat, brown-black pod, 2-4 inches long, ripening in Oct. and persisting.
Uses: Specimen, naturalizing. Used for fence posts because wood is very decay resistant. Salt tolerant. Dry sites.
Notes 2: Leafs out late in spring. Shade tree. Introduced in Michigan. Weedy.
Flowers light rose pink.
Vigorous tree; supposedly comes
partially true to type from seed. In III, Flint, and Dirr note under
Robinia psoudoacacia cv. Decaisneana this is considered a hybrid,
Robinia x ambigua(Robinia pseudoacacia x Robinia viscosa) in III.
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