ACCOUNT OF GENUS SEDUM AS FOUND IN CULTIVATION. 147 
A. Flowers White. 
{a) Subshrubs. 
Except for the Siberian S. populifolium, which stands quite apart 
as regards growth-form from all other Eurasian Sedums, the species 
grouped here are Mexican ; of these, Bourgaei, guadalajaranum and 
griseum are closely allied to each other. 
The following white-flowered sub-shrubby species are in cultivation. 
populifolium Pallas allanioides Rose 
retusum Hemsley Bottrgaei Hemsley 
Adolphi Hamet guadalajaranum S. Wats. 
frutescens Rose griseum Praeger 
58. Sedum populifolium Pallas (fig. 78). 
5. populifolium Pallas, Reise, 3, 730, tab. O, fig. i, 1776. Masters in 
Gard. Chron., 1878, ii. 463. 
Illustrations. — Pallas, loc. cit. De Candolle, " Plantes Grasses," tab. no. 
Bot. Mag., tab. 211. Revue Horticole, 1857, 150, fig. 6. 
A most distinct species, standing quite apart in its slender, bushy 
growth and long-stemmed poplar-like leaves, which fall in autumn. 
Description. — A deciduous, glabrous sub-shrub, i-i^ foot high. Roots 
fibrous. Stem erect, slender, woody, much branched, with thin, smooth, dark 
purple bark. Leaves alternate, green, flat, fleshy, stalked ; petiole slender, | inch 
long ; lamina ovate, cordate, acute, f inch long, coarsely and irregularly toothed 
throughout. Inflorescences lax, of terminal, much branched, corymbose cymes. 
Buds ovoid, blunt, tipped pink. Flowers pale pink or white, J to | inch across, 
smelling of hawthorn. Stpals green, deltoid, ^ the petals. Petals spreading, 
lanceolate, acute. Stamens slightly exceeding the petals, filaments pinkish, 
anthers red-purple. Scales white, quadrate, rather longer than broad. Carpels 
white, erect, shorter than the stamens. 
Flowers August. 
Habitat. — Siberia. 
Long known in gardens, and deservedly a favourite. It is one 
of the very few Sedums which have scented flowers, possessing as 
it does a strong odour of hawthorn. No varieties are recorded. The 
flowers vary in colour from white to pale pink, and a form received 
from the Lissadell Nursery, Co. Sligo, has the leaves much less toothed 
than usual (fig. 78, separate leaf). Appropriately named popttli- 
folium — poplar-leaved. 
59. Sedum retusum Hemsley (fig. 79). 
S. retusum Hemsley, " Diagnoses Plant. Nov./* 3, 51, 1880. Hemsley, 
" Biol. Centr. Amer., Bot.," 1, 398. " N. Amer. Flora," 22, 68. 
A distinct, erect sub-shrub a foot or so high, easily known by its 
spathulate leaves deeply notched at the top (but occasionally the 
notch is absent) and its white flowers with a red eye. S. oxypdalum 
sometimes bears similar notched leaves, but it is a much larger plant 
with star-like dull-red flowers, while those of S. retusum sire rather 
bell-shaped and have blunt petals. 
