. The elements of materia medica and therapeutics (Volume 2) . rsia. According to Olivier the Tragacanth of Asia Minor, Armenia,and Northern Persia, forming the greater part of that of Europe, is yielded bythis species. 2. A. Gummifer, E—Flowers three to five, axillary, sessile. Calyx five-cleft, together with the legumes woolly. Leaf-lets four to six pairs, oblong-linear, smooth (De Fig. 222. Cand.)—Lebanon. According to La Billardierethis species yields Tragacanth (De Cand.) (Botanical Register, May, 1840) re-ceived this plant from. Mr. Brant, English Con-sul at Erzeroum, as the t
. The elements of materia medica and therapeutics (Volume 2) . rsia. According to Olivier the Tragacanth of Asia Minor, Armenia,and Northern Persia, forming the greater part of that of Europe, is yielded bythis species. 2. A. Gummifer, E—Flowers three to five, axillary, sessile. Calyx five-cleft, together with the legumes woolly. Leaf-lets four to six pairs, oblong-linear, smooth (De Fig. 222. Cand.)—Lebanon. According to La Billardierethis species yields Tragacanth (De Cand.) (Botanical Register, May, 1840) re-ceived this plant from. Mr. Brant, English Con-sul at Erzeroum, as the tragacanth plant of Koor-distan, which yields the white or best kind oftragacanth. 3. A. creticus.—Ftowers axillary, sessile,clustered. Calyx five partite, with feathery,setaceous lobes rather longer than the five to eight pairs, oblong, acute, tomen- Astragalus (De Cand.)—Mount Ida, in Crete, where it yields Tragacanth, according to Tournefort. 4. A. strobiliferus, Lindley.—Flowers capitate in an ovate, sessile, axil-. 572 ELEMENTS OF MATERIA MEDICA. lary strobile.—Bracts imbricated, pointletted, tomentose. Calyx feathery, five-cleft. Segments of the corolla equal. Leaflets three-paired, woolly, oval, awnedat the apex, narrow at the base (Lindley).—Koordistan.—This plant was sentby Mr. Brant as the shrub from which the red or inferior species of gum traga-canth is produced. (Botanical Register. Lond. 1840. Miscellaneous Notices,p. 38.) Production.—Tragacanth is a natural exudation from the stem of the before-mentioned plants. The cause of the exudation of this, as of other gums, is thusexplained by De Candolle. (Phys. Veg. t. i.) The gummy matter resides inthe bark and albumen; it is the nutritive juice of the plant; and its escape,thefefore, is analogous to hemorrhage in atjimals : hence plants in whom it spon-taneously occurs are always in a sickly state. The mechanical cause of theexpulsion of this juice is dependent on the un
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