42 



NATURAL HISTORY OF PLANTS. 



m§ 



Acacia alala. 



A. Lebbeh, 1 Julibrissin,' odoratissima? montana* lebbehioides; &c, 

 which have the flowers of A. lophanta, but with a longer staminal 

 tube, 6 nor for Zi/gia' (figs. 34, 35), in which this tube 

 '" is excessively developed, extending far beyond the 

 corolla, and twisted into a spiral within 

 the perianth before the expansion of the 

 flower. We shall then have four new sec- 

 tions to add to the genus Acacia, under the 

 names of Vachellia, Lophanta, Albizzia, and 

 Zygia, including twenty-five species from 

 warm countries all over the world. Zygia is 

 found in tropical Africa and Asia ; 8 Albizzia, 

 in the same regions in temperate Asia, 

 Java, Australia, and the neighbouring 

 islands. 9 



The flowers of Inga w are like those of 

 Albizzia, with indefinite monadelphous sta- 

 mens." But the leaves are simply pinnate, 

 and the pod is linear, straight or slightly 

 curved, flat tetragonal or subcylindrical, 

 coriaceous or almost fleshy, scarcely dehis- 

 cent, with both dorsal and ventral sutures 

 often thickened prominent dilated and 

 grooved longitudinally. The genus consists of trees and shrubs 



Fig. 31. 

 Inflorescence. 



Fig. 32. 



Floriferous 



brand i. 



1 W., Spec, iv. 1066. — A. speciosa W.. 

 loc. cit., 1069. — Mimosa Lebbek L. — Albizzia 

 Lebbek Benth., in Hook. Journ., iii. 87. — A. 

 latifolia Borv., loc. cit., 32. 



2 W., loc. cit., 1065. — Mimosa Julibrissin 

 Scop., Del. Fl. Insurbr., i. 18. — M. arborea 

 Foesk., Fg.-Arab., 177. — Albizzia Julibrissin 

 Duhazz., loc. cit. 



3 W., loc. cit., 1063. — Mimosa odoratissima 

 L., Suppl., 437. — Albizzia odoratissima 

 Kenth., loc. cit., 88. — A. micrantha Boiv., 

 loc. cit., 34. 



4 Jungh., Tijdscltr. Nat. Giesch., x. 216. — 

 A. vulcanica Kobth., in Flora (1827), 705. — 

 Inga montana Jungh., Peis., 288. — Albizzia 

 montana Benth., Fl. Jungh., 267. 



5 DC, Prodr., ii. 467, n. 187. — Albizzia 

 lebbehioides Benth., loc. cit., iii. 89. 



6 Geisebach has already (Fl. Brit. W. Ind., 

 233), referred Albizzia to Acacia. 



' Benth., in Rook. Joum., iii. 92 (nee 

 P. Be.).— Endl., Gen., n. 6836 ? 



8 DC., Mem. Legum., xii. t. 65 ; Prodr., 



ii. 440, n. 91, 92.— Bruce., Voy., t. 4, 5.— 

 I'i iees., Mossamb.,t. 1. — Oliv., Fl. Trop.Afr., 

 ii. 361. 



9 Vent., Jard. Cels., t. 20. — Labill., Serf. 

 Austr.-Caled., 67, t, 66, 67. — Jacq., Icon., 

 t. 198.— Boxb., PI. Coromand., t. 120-122. 

 — Wall., PI. Asiat. Par., ii. t. 177.— Benth., 

 Fl. Austral., ii. 421. — Hakv. & SOHD., Fl. 

 Cap., ii. 281. — Walp., Sep., v. 595; Ann., 

 i. 266 ; ii. 457 ; iv. 457.— Oliv., Fl. Prop. Afr., 

 ii. 355. 



10 Plum., Gen., 13, t. 25. — W., Spec, iv. 

 1004 (part.)— K., Mimos., 35.— DC, Prodr., 

 ii. 432. — Spach, Suit, a Buffon, i. 55. — 

 Fxdl., Gen., n. 6837. — B. H., Gen. 599, 

 n. 398. 



11 The lower part of the tube they form is 

 often united for some distance with the base of 

 the corolla tube, just as in Pentaclethra. We 

 shall find this arrangement in all the remaining 

 Mimoseee. It does not usually occur in Acacia 

 proper or in Albizzia. Organogenic investiga- 

 tions can alone reveal the signification of the 



