ACCOUNT OF GENUS SEDUM AS FOUND IN CULTIVATION. 213 



Flowers April (cold frame) ; May-June (in the open). Hardy in 

 all mild areas in the British Isles. 



Habitat. — Not certainly known, but undoubtedly Mexico. 

 Described by Herisley forty years ago from English garden specimens 

 labelled S. spathnlifoliiim, and still found in English gardens. I 

 have had it from nearly a dozen different sources, labelled confusum, 

 dendroideum, or praealtum. Apparently not in cultivation in America, 

 nor as yet re-collected in Mexico. 



It is the hardiest of the dendroideum group, and survived the 

 severest Dublin winters which killed out 5. praealtum almost entirely. 



A plant received from La Mortola as " sp. Mexico " is a large 

 form, with longer branches, and leaves i| to 2 inches long and pro- 

 portionately broad. In flower it is identical with the type. Otherwise 

 I have seen no variation in the species. 



97. Sedum amecamecanum Praeger (fig. 122). 



5. amecamecanum Praeger in Journ. of Bot., 54, 44, 1917. 



A member of the sub-shrubby, flat-leaved section of Mexican 

 Sedums, easily distinguished from the dendroideum group [dendroideum, 

 praealtum, confusum) by its much smaller size arid pale buff-yellow 

 flowers ; and from the rest of the section by its oblanceolate (not 

 spathulate) leaves, &c. 



Description. — A small, erect, glabrous, evergreen sub-shrub, 6 inches or more 

 in height. Stem smooth, round, with wide-spreading branches, bare below, 

 reddish, marked with small greyish leaf-scars. Leaves rather crowded, flat, 

 fleshy, green, patent or reflexed, sessile, with a very short truncate spur, oblanceo- 

 late, bluntly pointed, f inch long by \ inch broad. Flowering shoots not different 

 from the barren ones. Inflorescence terminal, rather dense, roundish, | to i inch 

 in length and breadth, leafy, uppermost bracts resembling the sepals. Buds 

 lanceolate to oblong, blunt, ribbed. Flowers f inch across, of a palish buff- 

 yellow. Sepals unequal, blunt, linear or club-shaped, very fleshy, green, wide- 

 spreading, shortly spurred, separate to the base. Petals broadly lanceolate, 

 wide-spreading, acute, J longer than the longest sepal. Stamens yellow! 

 spreading, f the petals. Scales short, squarish, emarginate, deep orange above 

 with a whitish base. Carpels erect, tapering, equalling the stamens, greenish 

 yellow, styles slender, slightly spreading, orange-yellow. 



Flowers May (cold frame). Not hardy at Dublin, but hardy at 

 Rostrevor, a very mild spot. 



Habitat. — Amecameca, Mexico. 



Sent to Wisley from Washington unnamed under the number 

 ^, having been collected by C. A. Purpus in 1906 (No. 108). 



98. Sedum pachyphyllum Rose (fig. 123). 



S. pachyphyllum Rose in "Contrib. U.S. Nat. Herb.," 13, 299, 1911. 



Illustration. — Loc. cit., pi. 58 (photo). 



A large, very thick-leaved Sedum most resembling S. allantoides 

 and to a less degree 5. Treleasei ; from the latter it can be at once 

 separated by its terete, not flat, leaves. In flower, its dense, flatfish 



