156 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 
thick, enlarged but scarcely spurred at base. Inflorescence terminal, lax, 
of about 4 leafy, curved, patent branches, each 1-2 inches long. Buds conical, 
blunt, with wide-spreading sepals. Flowers shortly stalked, nearly \ inch 
across. .Sepals resembling the leaves, very unequal, green, fleshy, blunt, 
separate to the base, where they are slightly enlarged. Petals white, often 
tipped red, patent, ovate-lanceolate, attenuate, keeled, twice the sepals. 
Stamens f the petals, filaments white, anthers reddish. Scales linear, thrice as 
long as broad, dark purple, conspicuous when the flower is viewed from above. 
Carpels slender, erect, white, equalling the stamens, with long styles tipped red. 
Flowers June-July (gentle heat) ; August-November (cold frame). 
Nearly hardy at Dublin. Hardy at Rostrevor. 
Habitat. — Central Mexico. 
Named in honour of Eugene Bourgeau, indefatigable collector 
and traveller, who first gathered it. 
64. Sedum guadalajaranum S. Watson (fig. 83). 
S. guadalajaranum S. Watson, Proc. Amer. Acad., 22, 411, 1887. 
" N. Amer. Flora," 22, 64, 1905. 
A very slender, sub-shrubby, evergreen species, coming near 5. 
Bourgaei Hemsley and S. griseum Praeger. It differs from both in 
its thickened rootstock and tuberous roots and very thin wiry stems ; 
from the former also (to which it comes nearest) in. its smaller size, 
shorter glaucous sub-terete (not green flattened) leaves, shorter, more 
oblong, less attenuate petals with reddish colour at the base, shorter, 
less attenuate, green (not white) carpels, and scales short and 
pale red, not long and dark purple. 5. griseum is a much stouter 
little plant, with tapering (not linear) leaves and a dense (not lax) 
inflorescence. 
Description. — A rather glaucous, very slender, wiry, sub-shrubby evergreen 
perennial, less than a foot high. Rootstock horizontal, thickened, with tuberous 
roots. Stem erect, slender, wiry, round, reddish, branching, bare of leaves 
below, glandular-rough above. Leaves rather glaucous, narrowly linear, 
blunt, sub-terete, slightly flattened above, broadest at the base, slightly spurred, 
i inch long. Inflorescence terminal, of 2-3 lax branches with a flower in the 
fork. Buds acute, surrounded by the erect sepals. Flowers f inch across, sessile. 
Sepals unequal, resembling the leaves, wide-spreading in flower, linear, blunt, 
scarcely spurred, slightly broader at the base. Petals patent, slightly exceeding 
the sepals, ovate-lanceolate, attenuate, greenish-white, reddish at base, with 
a reddish keel and red apiculus. Stamens nearly equalling the petals, filaments 
white, anthers dark red. Scales reddish, rather longer than broad. Carpels 
slender, erect, light green, with short styles, wide-spreading and red in fruit. 
Flowers June (gentle heat) ; July- August (cold frame) . Not hardy. 
Habitat. — Rio Blanco, JaUsco, Mexico. 
Received from the New York Botanic Garden. 
65. Sedum griseum Praeger (fig. 84). 
5. griseum Praeger in Journ. of Bot., 54, 43, 1917. 
Allied to S. guadalajaranum and 5. Bourgaei, having like them 
a ^ub-shrubby habit, very narrow leaves, and white flowers, but it 
is stouter and more compact than either. S. guadalajaranum is 
separated at once by its thickened rootstock with tuberous roots, 
