ACCOUNT OF GENUS SEDUM AS FOUND IN CULTIVATION. 133 
S. ebracieaium, it varies as regards hairiness and colour of stem and 
shape of leaf sufficiently to include S. ruhricaule. 
The name refers to the red colour of the stems. 
5. chapalense S. Watson, Proc. Amer. Acad,, 22, 411, 1887. 
Synonym. — Sedastrum chapalense Rose in " N. Amer. Flora," 22, 59, 1905. 
Distinguished from the other Sedastrums in cultivation by its 
small size (about 4 inches high) , glabrous stems (though the leaves are 
slightly pubescent), and thin stem-leaves. Plants sent from Washing- 
ton by Dr. Rose unfortunately died before flowering, so I have not had 
an opportunity of studying the plant. 
Description. — Stems stout, about 4 inches high, much branched above, 
glabrous, yellowish-green. Leaves slightly pubescent, those of the barren shoots 
rosulate, obovate, or ovate, rather acute, | inch long, stem-leaves rather thin. 
Flowers sessile, arranged along one side of the branches, 5-parted. Calyx slightly 
pubescent, lobes unequal, oblong-ovate, rather acute. Petals oblong-ovate, 
acute, ^ inch long, white. Stamens 10. Scales smd\\. Cay^e/s equalling the petals. 
Habitat. — Mexico. Not hardy. 
The above description is taken from those of S. Watson and Rose 
(loc. cit.). 
Named after the type locality, Chapala. 
Small (3-6 inches high). Leaf-rosettes absent, or small and lax. 
Stems annual or lasting up to eighteen months. Carpels not hollowed 
behind the scales. 
potosinum Rose. 
49. Sedum alamosanum S. Watson (fig. 69). 
S. alamosanum S. Watson in Proc. Amer. Acad., 25, 148, 1890. 
" N. Amer. Flora," 22, 62, 1905. 
A handsome little Mexican species, near to S. mellUulum, with 
which it has been confounded. The very dense-leaved glaucous 
young shoots, few-flowered inflorescence, bright-red buds, reddish-white 
flowers, and early vernal blooming, sufficiently distinguish it from S. 
mellitulum, which is laxer and greener in growth, with longer leaves, 
a compact, flattish inflorescence, greenish-white buds, and quite white 
flowers which open in autumn. 
Description. — A small glaucous perennial. Stems tufted, erect, afterwards 
diffuse, often slightly branched, 3-5 inches long. Leaves crowded, \ inch long, 
linear-oblong, blunt, ascending, very glaucous, ultimately reddish, covered, save 
48. Sedum chapalense S. Watson. 
Series II. Alamosana. 
alamosanum S. Watson. 
mellitulum Rose. 
Cockerellii Britton. 
Wrightii A. Gray. 
lenophylloides Rose. 
helium Rose. 
versadense Thompson. 
diversifolium Rose. 
