In the third edition of the _Species Plant._ of LINNAEUS, published in 1764, thirteen Myrtles are described; in the 13th edition of the _Syst. Natur._ published by GMELIN in 91, forty-one are enumerated; thus in twenty-seven years this genus has gained an accession of twenty-eight species: most of these are natives of warm climates, and few comparatively have been introduced to this country, six species only being mentioned in the _Hort. Kew._ of Mr. AITON, in that work the _tomentosa_ here figured, not known to LINNAEUS or MILLER is specifically described, and there Mr. AITON informs us that it is a native of China, and was introduced by Mrs. NORMAN about the year 1766. Since that period it has fallen into the hands of various cultivators, and flowered perhaps in greater perfection than it did originally at Kew; the peduncles, in the various specimens we have seen usually supporting more than one flower. It is a shrub of great beauty, both in respect to its foliage and flowers, bearing but little similitude to the common Myrtle, if suffered to grow, acquiring the height of many feet. Its blossoms are produced in June and July, the buds are covered with a white down, as is also the underside of the leaves, whence its name of _tomentosa_. It has been customary to treat it as a stove plant, such it is considered in the _Hort. Kew._ there is great reason however to believe, that it is by no means tender, and that it may succeed as most of the Chinese plants do in a good greenhouse. It is usually increased by cuttings which are struck difficulty. [Illustration: _No 250_] [251] ALLIUM DESCENDENS. PURPLE-HEADED GARLICK. _Class and Order._ HEXANDRIA MONOGYNIA. _Generic Character._ _Cor._ 6-partita, patens. _Spatha_ multiflora. _Umbella_ congesta. _Caps._ supera. _Specific Character and Synonyms._ ALLIUM _descendens_ caule subteretifolio umbellifero, pedunculis exterioribus brevioribus, staminibus tricuspidatis. Linn. _Syst. Vegetab. ed. 14._ _Murr. p. 322._ _Ait. Kew. v. 1. p. 425._ ALLIUM staminibus alterne trifidis, foliis fistulosis, capite sphaerico non bulbifero atropurpureo. _Hall. All. Tab. 2. f. p. 355. xx. ii._ BARON HALLER in his most admirable _Monographia_ on the plants of this genus, published in his _Opuscula Botanica_, describes and figures this species, a hardy perennial, being a native of Switzerland, and cultivated according to Mr. AITON, in the garden at Oxford in 1766.