144 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 
57. Sedum diversifolium Rose (fig. 77). 
S. diversifolium Rose in Bulletin New York Bot. Garden, 3, 44, 1903. 
" N. Amer. Flora," 22, 73. 
A delicate, very succulent, fresh green little plant, recognized by 
its tufted habit, annual stem crowded with shining pellucid leaves 
very convex on both sides, and few sessile yellow flowers. The leaves 
fall off very easily and at once form new plants from buds at the point 
of detachment. 
Description. — A glabrous tufted perennial. Stems annual, weak, at first 
erect, unbranched, later decumbent with a few branches, round, smooth, 4-8 
inches long. Leaves alternate, those of the young shoots densely imbricate, 
slightly glaucous, flat, fleshy, papillose, obovate, sessile, inch long ; those of 
the flowering shoots caducous, bright green, crowded, patent, J-^ inch long, 
very fleshy, very convex on both sides, narrower and smaller near summit. In- 
florescence of a terminal flower with one or two on either side. Buds ovate, rather 
acute. Flowers f inch across, pedicels short. Sepals unequal, ascending, 
resembling the leaves. Petals clear yellow, wide-spreading, broadly lanceolate, 
acute, twice the sepals. Stamens spreading, yellow, f the petals. Scales whitish, 
rectangular, longer than broad. Carpels yellow, slightly spreading, shorter 
than the stamens. 
Flowers February-March (gentle heat) ; May (cold frame). Not 
hardy. ' 
Habitat. — State of Mexico, Mexico. 
In his description of the species, Dr. Rose says that the flowers 
are pale yellow, inconspicuous, and solitary. In the plants he sent 
me, and others received from New York, which have flowered at 
Glasnevin, they are clear yellow, fairly conspicuous, and usually in 
threes. 
The young shoots arise in winter, before the old ones have flowered, 
so that the stems have a life of about 18 months ; but the specimens 
observed by Dr. Rose at Washington and New York bloomed in 
December. In the young stages they recall those of 5. longipes. 
Named on account of the difference between the young and mature 
leaves. 
SECTION VII.—SEDA GENUINA. 
Section Seda Genuina Koch, "Synopsis Deutsch. und Schweiz. Flora," 
259, 1836; EusEDUM, Boissier, "Flor. Orientalis," 2, 775. 
Perennial. Stems perennial, creeping or erect and sub-shrubby, 
bearing barren and annual flowering shoots. Flowers hermaphrodite, 
usually 5- (rarely 4- to 9-) parted. Hardy or tender. 
This section contains several well-marked groups of closely related 
species with a defined geographical range, such as the Involucrata 
(spurium, stoloniferum, proponticum, Stevenianum) from the Caucasus 
region, the Spathulifolia {spathulifolium, yosemitense, rubroglaucum, 
Hallii, oreganum, divergens) from Western North America, the 
Rupestria [rupesire, reflexum, altissimum, anopetalum, stenopetalum, 
pruinatum, amplexicaule) from Europe, with one in America ; also a 
