I08 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



divide itself naturally into sub-groups, though many of the species 

 stand out clearly by individual characters — Selskianum by its dense 

 hairiness, floriferum by its much-branched stems, hybridum by its 



Fig. 54. — Carpels of species of Aizoon section (the front one removed to show 

 degree of attachment), a, S. Aizoon ; b, Ellacombianum ; c, kam- 

 tschaticum ; d, floriferum ; e, hybridum ; f, Middendorfjianum. All X 2. 



creeping stems and barren shoots. Aizoon and hybridum vary greatly 

 in some characters, and Middendorffianum has two distinct forms : 

 this tends to render more difficult the separation of this closely allied 

 group of species. 



36. Sedum Aizoon Linn. (figs. 54a, 55, 56). 



5. Aizoon Linn., "Species Plantarum," 430, 1753. Maximowicz in 

 Bulletin Acad. Petersbourg, 29, 143, 1883. Masters in Card. 

 Chron., 1878, ii. 267. 



Synonyms. — S. Maximowiczii Regel, " Gartenflora," 1866, 353, tab. 528. 

 Masters in Card. Chron., 1878. ii. 268. S. Woodwardii N. E. Brown in Kew 

 Bulletin, 191 2, 390. S. Selskianum of many gardens (not of Regel and Maack, 

 see p. 112). S. Laggeri (a nomen nudum) of some gardens. 



Illustrations. — De Candolle, " Plantes Grasses," tab. loi. Regel, " Garten- 

 flora," tab. 528 (as Maximowiczii). 



An old garden plant, usually grown under the name Maximowiczii 

 or Selskianum. (Other names under which the plant came to me axe 

 aizoideum, Alberii, asiaiicum, euphorbioides, kamtschaticum, Laggeri, 

 scabrum, and Wallichianum.) The only species with which it might 

 be confounded is the true Selskianum, but the latter is hairy all over, 

 and has narrower leaves and smaller flowers borne in larger numbers. 

 S. Aizoon is unique among the well-marked group to which it belongs, 

 in its thickened carrot-like tuberous roots, which resemble those which 

 characterize the Telephium section ; these are well shown in a young 

 plant, as figured (fig. 56). It is generally at once recognizable by 

 its group of stout, erect, smooth stems a foot or more high, and dense 

 flat cymes of yellow flowers. 



Description. — A glabrous herbaceous perennial, quite leafless in winter, 

 without barren shoots. Rootstoch large, thick and knotted. Roots elongate, 

 fleshy and tuberous. Stems arising in spring from the rootstock, several or many, 

 erect, smooth, subangular, green, usually turning brown abruptly towards the 

 base, unbranched or with axillary branches above, i-ij foot high. Leaves 

 'linear-lanceolate to ovate-lanceolate, alternate, 2-3 inches long, usually rather 

 blunt, sharply toothed.above, narrowing at base to a short stalk, green, midrib 

 prominent on the paler underside. Inflorescence a dense terminal flattish leafy 

 cyme 1J-3 inches across, of about 5 forked branches with flowers in the forks, 

 leaves often forming a loose involucre. Buds ovate-oblong, often acute. Flowers 



