308 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 
Hamet from specimens collected among rocks on the Yo-lin-chan, 
Yunnan, by Delavay (No. 6726), and preserved in the Paris Her- 
barium. Also collected in Yunnan by Ducloux and others. De- 
scribed as annual ; but numerous plants, raised both in heat at Glas- 
nevin and in the open in my own garden, were biennial. The cultivated 
Fig. 184. — S. Leblancas Hamet. 
plants agreed well with the description, save that they were larger 
in most of their parts — leaves half again as long and broad, and 
sepals, petals, and carpels about -J- longer and broader. 
Hamet considers it allied to 5. Aliciae Hamet, indicum Hamet 
{paniculaium Wallich), perpusillum Hooker fil., Przewalskii 
Maximowicz, and Schoenlandi Hamet, and gives the points of difference. 
Species Incompletely Known. 
151. ? Sedum polyrhizum Praeger, sp. no v. (fig. 185). 
At once separated from all other species in cultivation by its 
curious stems, densely armed with rough scales arranged in rings, 
and shaggy with short aerial roots almost to the tips. 5. oaxacanum 
Rose, which resembles it in habit more than do most of the Mexican 
species, has its stems somewhat similarly roughened, but to a very 
much less extent, and oaxacanum is a much stouter plant with broader 
leaves and no aerial roots. The present species much resembles in 
habit and leaf a small S. album. 
The plant came from New York Botanic Garden labelled 5. 
oaxacanum, and is probably Mexican. Though it grows freely, all 
efforts to get it to flower have been unsuccessful both at Glasnevin 
and in my own garden, so that its reference to the genus Sedum must 
