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.

More Information:                                

Distribution:  Eastern and central U.S., widely planted in temperate regions.

Synonyms:  

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.

Problems:      

Culture:   

Links:   

Notes:   

Notes 2:   Leafs out late in spring. Shade tree. Introduced in Michigan. Weedy.

Notes 3:   

Cultivars:   

                 var. decaisneana 
                                 [ 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. ]

                 'Umbraculifera'

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