342 TAMARICACE^. [Hypogynous Exogens. 



indica, dioica, Furas, and orientalis are highly astringent, and are used both in medicine 

 and dyeing. Myriearia germanica, a common shmb in oiu* gardens, has a balsamic 

 astringent bitter bark, which was formerly oflficinal. JNIp-icaria herbacea is used as 

 tea among the IMonghols, and its woody tissue is considered to be tonic. 



GENERA. 

 Tamarix, L. \ MjTicaria, Desv. \ Trichaurus, Am. 



Numbers. Gen. 3. Sp. 43. 



LythracecB ?■ 

 Position. — Crassulacese ?. — Tamaricace^. — Fraukeniaceae. 

 Reaumuriacece. 



obsen-es that the Persian manna kno^Ti by the name of Gen, is formed by an insect in that way, and 

 is not found on the upper branches or leaves, but only on the larger branches covered by those minute 

 insects, and none is formed near wounds or cracks in the bark. This was particularly observed by 

 Colonel Frederick in Persia, in a latitude not much south of Mount Sinai, and his account corresponds 

 with that of a traveller who saw it in the same country both on a Tamarisk and on the small Oak of Ker- 

 manshaw. It is remarkable that the secretion should be unkno^-n in Egj-pt and Arabia, where the T. 

 gallica would seem to be common. Forskahl, who says it is the Tarfa of the Arabs, takes no notice of 

 any manna being produced by it, and Mr. Malcolmson informs me that he could gain no intelligence of 

 manna being produced by the Tamarisk in any of the south and west coasts of Arabia and Upper Egj-pt. 

 He obseiTed the trees frequently secreting salt, but not sugar. I must however add, that the plant which 

 this gentleman found the Arabs calling Tarfa, was T. orientalis, not T. gallica, as appeared from the 

 specimens he brought home. The bark of T. gallica is slightly bitter and astringent.— J'^ora Medica. 



