ACCOUNT OF GENUS SEDUM AS FOUND IN CULTIVATION. 67 



rootstock ; barren stems none. Leaves crowded, 1-2 inches long, green, 

 linear, entire, flat, and channelled above, rounded below, sessile, blunt, -J^ inch 

 or more broad. Inflorescence dense, racemose, 1-3 inches long by about 

 I inch across. Buds ovate-oblong, blunt. Flowers greenish-white, | inch long, 

 lower shortly pedicelled, upper sessile. Sepals greenish, linear, acute, widening 

 at the base, much exceeding the tube. Petals greenish-white, lanceolate, blunt, 

 keeled, spreading but not widely, ij times the sepals. Stamens erect, equalling 

 the petals, filaments white, anthers reddish. Scales small, quadrate. Carpels 

 erect, slender, greenish-white, at first equalling the petals ; large and often 

 flushed red in fruit. 



Flowers June-July. Hardy. 



Habitat. — Turkestan. 



Rather rare in cultivation. I have it from Berlin, Kew, Edinburgh, 

 and from several private collections ; and Mr. G. Reuthe offers the 

 true plant. Its name commemorates P. Semenow, Central Asian 

 traveller. 



19. Sedum rhodanthum A. Gray (fig. 28). 



5. rhodanthum A. Gray in Amer. Journ. Science, Ser. 2, 33, 405, 

 1862. S. Watson, " Bot. of Nevada, Utah and Colorado," loi, 

 1871. Masters in Gard. Chron., 1878, ii. 267. 



Synonym. — Clementsia rhodantka Rose in Bulletin New York Bot. Gard., 

 3, 3. 1903. "N. Amer. Flora," 22, 29. 



A species remarkable on account of its abnormal inflorescence, 

 which forms a dense raceme, very unusual in the genus. The only 

 Sedum which resembles it is S. Semenovii from Turkestan, in which, 

 however, the flowers are greenish-white and the leaves linear and 

 entire, while in rhodanthum the flowers are normally rose-coloured, 

 and the leaves are narrowly oblanceolate, and usually toothed near 

 the apex. Other differences will be seen from a comparison of figs. 

 27 and 28. 



Description. — An erect glabrous herbaceous perennial. Rootstock thick, 

 somewhat branched, resembling that of 5. roseum, except that the withered 

 straw-like bases of the old stems are persistent. Stems usually several from 

 the summit of the rootstock, erect, smooth, round, unbranched, very leafy, 

 about a foot high. Leaves alternate, sessile, linear-oblanceolate, acute, flat, 

 rather fleshy, green, ascending, entire or obscurely toothed near the apex, i 

 inch long by J inch wide, smaller below, bearing a median furrow on the face. 

 Inflorescence a dense raceme 1-3 inches long by about an inch across. Buds 

 lanceolate with spreading sepals. Flowers short- stalked, J inch long. Sepals 

 green or flushed red, erect, long, tapering, acute. Petals erect, slightly exceed- 

 ing the sepals, lanceolate, acute, longitudinally folded, rose-coloured. Stamens 

 erect, equalling the sepals, the epipetalous ones inserted half-way up, filaments 

 green, anthers red. Scales short, yellow, roundish, spreading. Carpels pink, 

 erect, equalling the stamens, erect in fruit ; styles short. 



Flowers June. Hardy. 



Habitat. — Meadows and streamsides in Rocky Mountains, 

 Arizona to Montana. 



Rare in cultivation. In gardens I have seen it only at Kew, and 

 from the nursery of Messrs. Ware at Feltham ; and a good gathering 

 of the plant came to me from Boulder, Colorado, under the name 

 Rhodiola integrifolia. The name rhodanthum is descriptive of its red 

 flowers (which, according to American botanists, vary into white). 



