Robinia pseudacacia

subsp. var.
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Standard Cyclopedia of Horticulture

Robinia pseudacacia, Linn. False Acacia. Black Locust. Yellow Locust. Fig. 3413. Tree, to 80 ft., with deeply furrowed dark brown bark and prickly branches: lfts. 7-19, oval or elliptic, rounded or truncate and mucronate at the apex, glabrous or slightly pubescent while young, 1-2 in. long: fls. white, very fragrant, about 3/4in. long, in pendulous puberulous racemes 4-5 in. long: pod linear-oblong, reddish brown, 3-4 in. long. May, June; fr. in Aug. and Sept., remaining on the branches during the winter. Pa. to Ga., west to Iowa, Mo., and Okla., often naturalized elsewhere; probably the only American tree which has become extensively naturalized in Eu. S.S. 3:112, 113. F.E. 32:393. Gn. 61, p. 61. G.M. 45:513. H.W. 3:58, p. 104.—Many varieties are in cult., of which perhaps the following are the best known. Var. Robinia umbraculffera, DC. (var. inermis, Kirchn., not DC.). Forming a dense subglobose head, with unarmed branches: rarely flowering. Much used in Eu., when grafted high, in formal plantations and as a small street tree. M.D.G. 1903:630. Var. Bessoniana, Nichols., with slenderer branches forming a less dense head, and var. Rehderi, Kirchn., a low subglobose form, usually grown on its own roots (G.W. 2, p. 217), are forms of var. umbraculifera. Var. stricta, Loud., is a broadly pyramidal form. Var. pyramidalis, Pepin (var. fastigiata, Nichols.), is a narrow pyramidal or columnar form with unarmed branches. Gt. 6:190. I.H. 6, p. 20. B.H. 14, p. 27. F. 1874, p. 242. G.C. III. 41:151. Var. Robinia pendula, Loud., with somewhat pendulous branches. Var. tortuosa, DC. A slow-growing form with short twisted branches sometimes pendulous at the tips. G.W. 2, p. 218. Var. Ulriciana, Reuter. With spreading slightly pendulous branches and large drooping lvs. Var. inermis, DC. Branches unarmed: lvs. dark green: habit like the type. Var. monophylla, Carr. Lvs. simple or partly with 3-7 large lfts. R.H. 1860, pp. 630, 631. Var. bullata, Koch. Lfts. crowded, more or less bullate. Var. crispa, DC. Lfts. undulate or crisped. Var. Robinia amorphifolia, Loud. (var. mimosaefolia, Hort.), with narrow, oblong lfts. Var. dissecta, Nichols. Lfts. linear. R.H. 1875, p. 379. Var. aurea, Kirchn. Foliage yellow. Var. purpurea, Dipp. Young foliage purple. Var. semperflorens, Carr. Flowering during the whole summer. R.H. 1875:191. Var. Decaisneana, Carr. Fls. light rose-colored. R.H. 1863:151. F.S. 19:2027. I.H. 12:427. Gn. 9:36; 34, p. 174. G.Z. 9:160. G.M. 56:971.—This is the largest species of the genus and its hard and strong, close-grained timber is much esteemed for its strength and its durability in contact with the soil. The above text is from the Standard Cyclopedia of Horticulture. It may be out of date, but still contains valuable and interesting information which can be incorporated into the remainder of the article. Click on "Collapse" in the header to hide this text.

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References

• Standard Cyclopedia of Horticulture, by L. H. Bailey, MacMillan Co., 1963

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