34 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



2. Sedum heterodontum H. f. and T. (fig. 7). 



S. heterodontum Hooker fil. and Thomson in Journ. Linn. Soc, Bot., 

 2, 95. 1858 ; Clarke in Hooker, " Flor. Brit. India," 2, 417. 

 A plant of very distinct appearance, but the similarity of its 

 floral parts to those of S. roseum may eventually place it as a variety 

 of that polymorphic species, as suggested by Hooker and others. 

 Easily identified among the species of the Rhodiola section by its 

 very short, broad, sessile, coarsely-toothed leaves, scattered along 

 tall stems, i-ij foot high. 



Description. — A dioecious herbaceous perennial. Rootslock thick, elongate, 

 aerial, occasionally branched, similar to that of S. roseum. Stems annual, several 

 together from the summit of the branches of the rootstock, erect, i-ij foot 

 high, smooth, green, round, unbranched, leafy throughout. Leaves alternate, 

 triangular to ovate, from a clasping base, coarsely toothed, fleshy, flat, ^-J inch 

 long by about ^ inch broad, green or glaucous, loosely disposed on the stem. 

 Inflorescence terminal, dense, about an inch across, not leafy, branches very 

 short, riowers 4-merous, on very short pedicels. Male flower : — J— f inch 

 long ; sepals linear, blunt, distant, greenish ; petals linear, blunt, yellowish or 

 reddish, i ^ times the sepals, spreading ; stamens wide-spreading, slightly exceed- 

 ing the petals, filaments streaked red, anthers buff flushed red ; scales large, 

 half as long as the carpels, oblong or quadrate, emarginate, bright red ; carpels 

 erect, blunt, linear-oblong, much shorter than the stamens, equalUng the sepals, 

 about twice the scales, greenish. Female flower : — petals and sepals similar, 

 of about the same length, linear, blunt, green or purplish, erect ; scales oblong, 

 orange, 2-3 times as long as broad, half the petals ; carpels large, i J-2 times the 

 petals, erect, rather oblong, green, tipped purple, styles very short. 



Flowers April-May. Hardy. 



Habitat. — Western Himalayas, 8,000-14,000 feet ; Afghanistan ; 

 Tibet. 



Rare in cultivation. A handsome glaucous form has been grown 

 in the rock-garden at Kew for some years. A greener form was in 

 Canon Ellacombe's deUghtful garden at Bitton, and Mr. G. B. 

 Milne-Redhead of Frome has sent me a less-toothed plant. I 

 have not heard of it elsewhere. These plants are all females except 

 that at Kew, where both sexes are represented. One of the earhest 

 of the Rhodiola section, it pushes (in Dublin) sometimes as soon 

 as January, and never later than March. In this respect it resembles 

 5. Kirilowii, and differs from 5. roseum. 



Clarke, in Hooker's " Flora of British India," describes the 

 leaves as " prominently white-margined." This applies to a certain 

 degree to some of the specimens in the Kew Herbarium ; none of 

 the Uving plants I have seen show this character. 



The specific name refers to the unequal toothing of the leaves. 



3. Sedum Kirilowii Regel (fig. 8). 



S. Kirilowii Regel in Nouv. Mem. Soc. Nat. Moscou, 11, 92, 1859. 

 Maximowicz in Bulletin Acad. Peiersbourg, 29, 128, 1883. 

 The remarkable brownish-red flowered form of this species is one 

 of the handsomest of Sedums, and is not infrequent in cultivation, 



