SEDUM _populifolium_ foliis planis cordatis dentatis petiolatis, corymbis terminalibus. _Ait. Kew. v. 2. p. 109._ SEDUM _populifolium_ foliis petiolatis cordatis dentatis, floribus paniculatis. _Linn. fil. suppl. p. 242._ SEDUM _populifolium_. _Pallas, it. 3. p. 730. t. O. fig. 2._ Professor PALLAS, the celebrated Russian naturalist, discovered this species of Sedum in Siberia, and in the year 1780, introduced it to the royal garden at Kew; the younger LINNAEUS describes it minutely in his _Suppl. Plantarum_, and observes, that in its general form it much resembles the _Saxifraga rotundifolia_. Its leaves are flat as in many of the other species, and when the plant grows in an open situation, exposed to the sun, they become as well as the stalks of a bright red colour, which adds much to its beauty. It is the only hardy Sedum cultivated; in our gardens with a shrubby stalk, its leaves however are deciduous, so that in the winter it loses its verdure, it flowers in July and August, and is readily increased by cuttings. As most of this tribe grow readily, and many of them naturally on rocks and walls, they may be in general regarded as proper rock plants, some of them however are apt by the quickness of their growth to extend over and destroy plants of more value; this fault, if such it may be deemed, is not imputable to the _populifolius_. Some not knowing its native place of growth, keep it in the green-house. [Illustration] [212] TANACETUM FLABELLIFORME. FAN-LEAVED TANSY. _Class and Order._ SYNGENESIA POLYGAMIA SUPERFLUA. _Generic Character._ _Recept._ nudum. _Pappus_ submarginatus. _Cal._ imbricatus, hemisphaericus. _Cor._ radii obsoletae, trifidae. _Linn. (interdum nullae omnesque flosculi hermaphroditi.) Murr._ _Specific Character and Synonyms._ TANACETUM _flabelliforme_ corymbis simplicibus, foliis deltoidibus apice serratis. _L'Herit. Sert. Angl. t. 27._ _Ait. Hort. Kew. V. 3. p. 169._ There is a neatness in the appearance of this plant, which joined to the singular form of its foliage, varying also from the general hue, entitles it to a place in the green-house. Mr. MASSON discovered it at the Cape, and introduced it here in 1774. _Ait. Kew._ It flowers from May to August, grows freely, and is usually propagated by cuttings. [Illustration] [Illustration] [213] POLYGONUM ORIENTALE. TALL PERSICARIA. _Class and Order._ OCTANDRIA TRIGYNIA. _Generic Character._ _Cal._ 0. _Cor._ 5-partita, calycina. _Sem._ 1. angulatum. _Specific Character and Synonyms._ POLYGONUM _orientale_ floribus heptandris digynis, foliis ovatis, caule erecto, stipulis hirtis hypocrateriformibus. _Linn. Syst. Vegetab. ed. 14. Murr. p. 377._ _Ait. Hort. Kew. V. 2. p. 32._ PERSICARIA _orientalis_ nicotianae folio calyce florum purpureo. _Tournef. cor. 38._ Schovanna-modelamuccu. _Rheed. Mal. 12. p. 147. t. 76._