ROB IX I A 



ROBIXIA 



20i7 



may also be increased by suckers and some, particularly 

 R. luspida, grow readily from root-cuttings. Varieties 

 are usually grafted, either on young seedling stock in 

 the house or outdoors in spring or on pieces of root in the 

 greenhouse; some dwarf forms, as R. Pseudacacia yar. 

 Rehderi are propagated by division, and other varieties, 

 particularly var. Bessoniana, by cuttings of mature 

 wood in fall; some varieties, as var. Decaisneana and 

 var. monophylla, may be raised from seed, as a large 

 percentage comes true. 



ambigua, 11. 

 amorphifolia, 1. 

 aurea, 1. 

 bella-rosea, 11. 

 Bessoniana, 1. 

 Boyntonii, 2. 

 britzensis, 8. 

 bullata, 1. 

 coloradensis, 8. 

 crispa. 1. 

 Decaisneana, 1. 

 dissecta. 1. 

 dubia. 11. 



INDEX. 



Elliottii, 4. 

 fastigiata, 1. 

 glutinosa, 10. 

 Hartwigii, 9. 

 hispida, 4, 5, 6. 

 Holdtii, 8. 

 inermis, 1. 5. 

 intermedia, 11. 

 Kelseyi, 3. 

 macrophylla, 5. 

 mimossefolia, 1. 

 monophylla, 1. 

 nana, 6. 



neo-mexicana, 7. 

 pendula, 1. 

 Pseudacacia, 1, 11. 

 purpurea, 1. 

 pyramidalis, 1. 

 Kehderi, 1. 

 rosea, 4, 5. 

 semperflorens, 1. 

 stricta, 1. 

 tortuosa, 1. 

 Ulriciana, 1. 

 umbraculifera, 1. 

 viscosa, 10, 11. 



A. Fls. white (light pink in one variety'): branchlets gla- 

 brous or slightly pubescent: pod smooth. 



1. Pseudacacia, Linn. FALSE ACACIA. BLACK 

 LOCUST. YELLOW LOCUST. Fig. 3413. Tree, to 80 ft., 

 with deeply furrowed dark brown bark and prickly 

 branches: fits. 7-19, oval or elliptic, rounded or trun- 

 cate and mucronate at the apex, glabrous or slightly 

 pubescent while young, 1-2 in. long: fls. white, very 

 fragrant, about ^4 in. long, in pendulous puberulous 

 racemes 4-5 in. long: pod linear-oblong, reddish brown, 

 3-A in. long. May, June; fr. in Aug. and Sept., remain- 

 ing on the branches during the winter. Pa. to Ga., 

 west to Iowa, Mo., and Okla., often naturalized else- 

 where; 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. 

 umbraculifera, 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. fasti- 

 giata, 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. 

 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 spread- 

 ing slightly pendulous branches and large drooping Ivs. 

 Var. ineimis, DC. Branches unarmed: Ivs. dark green: 

 habit like the type. Var. monophylla, Carr. Lvs. simple 

 or partly with "3-7 large Ifts. R.H. 1860, pp. 630, 631. 

 Var. bullata, Koch. Lfts. crowded, more or less bullate. 

 Var. crispa, DC. Lfts. undulate or crisped. Var. 

 amorphifolia, Loud. (var. mimos&folia, Hort.), with 

 narrow, oblong Ifts. 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. 



188 



AA. Fls. pink or purple. 



B. Plant glabrous or merely pubescent or tomentose: Ifts. 



usually less than 15. 



c. Pod smooth. 



2. Boyntonii, Ashe. Shrub, to 10 ft., unarmed: 

 branehlets glabrous or minutely pubescent at first: Ifts. 

 7-13, elliptic to oblong, obtuse, soon glabrous, %-l in. 

 long: racemes 8-12-fld., on spreading or ascending 

 peduncles; corolla rose-purple or pink with white, %in. 

 long: pod glabrous. May, June. N. C. and Term, to 

 Ga. and Ala. 



cc. Pod hispid or glandular hairy. 



3. Kelseyi, Bean. Shrub, to 10 ft.: branches with 

 slender prickles; branehlets glabrous: Ifts. 9-11, oblong- 

 lanceolate, acute, 



rounded at the 

 base, glabrous, 

 %-\ l A in. long: 

 racemes 5-8-fld.; 

 rachis and ped- 

 icels sparingly 

 glandular - hairy ; 

 calyx finely pu- 

 bescent, with or 

 without glandu- 

 lar hairs; corolla 

 rose-colored, 1 in. 

 long: pod oblong, 

 densely covered 

 with purple 

 glandular hairs, 

 1J-2-2 in. long. 

 May, June. N.C. 

 B.M.8213. G.C. 

 III. 44:427; 47: 

 391; 58: 72. J.H. 

 S. 36, p. 133, fig. 

 134. G. 33:461, 

 463. M.D. 1910, 

 p. 101. Addisonia 

 1 : 3. Very hand- 

 some and grace- 

 ful; the purple 

 frs. are also attractive. 



4. Elliottii, Ashe (R. hispida var. rosea, Elliott). 

 Shrub, to 5 ft.: branches with short spines; young 

 branehlets grayish or whitish tomentose: Ifts. 11-15, 

 elliptic, grayish pubescent beneath, %-l in. long: 

 racemes 5-10-fld. ; peduncles, pedicels, and calyx grayish 

 pubescent; corolla rose-purple or purple and white: 

 pod linear, hispid. May, June. N. C. to Ga. A very 

 handsome species easily distinguished by the dense 

 grayish pubescence without glands or bristles. 



BB. Plant more or less bristly or glandular-pubescent or 



viscid: pod hispid. 



c. Peduncles and branehlets hispid or the latter some- 

 times glabrous: Ifts. usually less than 15. 



5. hispida, Linn. (B. rosea, Marsh.). ROSE ACACIA. 

 Fig. 3414. Shrub, 1-3 ft., rarely higher: st., branchlets, 

 and peduncles and often the petioles hispid: Ifts. 7-13, 

 suborbicular to oval, obtuse and mucronate, glabrous or 

 nearly so, %-lM in. long: fls. rose-colored or pale 

 purple, 1 in. long, in short, 3-5-fld. racemes: pod rarely 

 developed, densely hispid, few-seeded. F.S.R. 2, p. 57. 

 J.H. III. 53:183. G. 4:499. Var. macrophylla, DC. 

 (var. inermis, Kirchn.). Branchlets and petioles nearly 

 destitute of bristles: Ifts. and fls. often somewhat larger. 

 Gn. 77, p. 268. G.M. 45:512. This species spreads 

 much by suckers, particularly in sandy soil; sometimes 

 grafted high to form a small standard and as such dis- 

 playing its large fls. to greater advantage. 



6. nana, Spach (R. hispida var. nana, Elliott). 

 Shrub, about 1 ft. high, in cult, sometimes higher: sts. 



