156 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



^ thick, enlairged 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 J 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 hnear) 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, haie of leaves 

 below, glandular-rough above. Leaves rather glaucous, narrowly linear, 

 blunt, sub-terete, slightly flattened above, broadest at the base, slightly spurred, 

 J 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) ; J uly- August (cold frame) . Not hardy. 

 Habitat. — Rio Blanco, Jalisco, Mexico. 

 Received from the New York Botanic Garden. 



65. Sedum griseum Praeger (fig. 84). 



S. griseum Praeger in Journ. of BoL, 54, 43, 1917. 



Allied to 5. guadalajaranum and S. Bourgaei, having like them 

 a sub-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. 



