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Vachellia farnesiana (L.) Wight & Arn. - syn.Acacia farnesiana (L.) Willd.; Mimosa farnesiana L. - Fabaceae
cassie, sweet acacia, opopanax, Süße Akazie, Antillenakazie, Cassia, Schwammbaum

Much-branching shrub with straight spines, up to 3m high, native to West Indies, Central America, naturalized in tropics (Asia, Africa, Australia); cultivated in USA, Egypt, North Africa; stipules of some or all the leaves persistent and spinescent; leaves bipinnate, the pinnae 2-6 pairs; leaflets mostly 10-25 pairs, linear, glabrous; flowers deep yellow, very fragrant, in heads 2-3 in the older axils; pod cylindric, scarcely dehiscent, filled with a pith wich seperates the seeds from each other (grown in early times in botanical gardens of Rome, the Farnesian Garden).

„The flowers are processed through distillation to produce a perfume called Cassie.“
http://en.wikipedia.org/wiki/Vachellia_farnesiana

The whole plant (roots, leaves, bark, pods) contain tannins. Gum exuding from the trunk resembles gum arabic from Acacia senegal. Roots, leaves and bark are used medicinally. Pods (containing 23% tannin) and bark used to tan leather.
Acacia farnesiana bark, cassie bark, is used as astringent and demulcent remedy.
Acacia farnesiana flowers (Flores Aaciae, Echte Akazienblüten) are used as an antispasmodic infuse.

„The absolute oil of cassie (Acacia farnesiana Willd.) has been thoroughly investigated by using several combined chromatographic techniques. Among the 38 new constituents which were thus identified in this oil, four deserve a particular mention, namely, the cis-3-methyldec-3-en-1-ol (I), the related acid III, the trans-3-methyl-dec-4-enoic acid (IV), and the homoterpene lactone dihydroactinidiolide (II). With the exception of the last one, these unusual C11 compounds play a prominent role in the characteristic fragrance of cassie oil.“
[Sur les constituants odorants de l'essence absolue de Cassie (Acacia farnesiana WILLD.)., Demole, E., Enggist, P., Stoll, M., Helvetica Chimica Acta, Vol.52(1), 1969, 24-32]
http://www.thegoodscentscompany.com/gca/gc1018791.html

Sargent, C.S., The Silva of North America, vol.3, t.141 (1899) [C.E.Faxon]
http://plantgenera.org/species.php?id_species=1256266