286 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
together; six of the seven species of Sedastrum and all three of the 
Mexican species of Lenophyllum have been grown; nearly fifty species 
of Dudleya have been under observation, besides many of the species 
of Sedum, Altamiranoa, Villadia, and other smaller genera. 
It is among the Echeverias, however, that I have had the finest repre- 
sentatives of this family, some of which promise to be of considerable 
horticultural value. Of the forty-five species of this genus recog- 
nized as distinct, I have forty now in cultivation. Among’ these the 
the most promising are the following: 
Echeveria elegans, of steel-green color, forming dense rosettes of thick 
leaves sometimes becoming tinged with red. 
Lecheveria subsessilis and EE. cuspidata, good bedding plants, both 
forming very compact rosettes, the first of a pale bluish color, the 
other of a bronze color. 
Echeveria palmeri and FE. subrigida, large species with broad, highly 
tinted leaves. The latter is an especially desirable plant for culti- 
vation. In the City of Mexico it is used in beds as corner pieces, 
often forming heads a foot in diameter. 
Lcheveria multicaulis is a tall species with shining leaves, which are 
often tinted. 
The genus Oliverella, named for Mr. George W. Oliver, of Wash- | 
ington, has proved to be one of my most valuable introductions. — It 
is easily propagated and grows rapidly, flowering the first season after 
cuttings are taken. It often forms large plants with weak, sometimes 
hanging, branches, and very large red flowers. All of my living plants 
have been cared for by the Bureau of Plant Industry of the Depart- 
ment of Agriculture. A great many plants have been distributed and 
others will be sent out on application. 
(2) Leeria elegans. wish to call attention once more to J/eeria 
elegans, or, as We should now call it, Seh/zocentron elegans. As I have 
stated before, //eer/a elegans is not congenerie with the other so-called 
species of Heeria, and since it is the type of the genus the other species 
must be taken up under the name Heterocentron.© This species was 
in flower for nearly two months in Washington during the summer of 
1904, It makes a good carpet plant, growing as well in the shade as 
in the sunlight. Living material can be sent to a limited number of 
growers who wish to experiment with it. 
The drawings for plate 63 were made by Dr. Theodor Holm. 
Plates 66, 69, 71, and 72, and figure 14 were drawn by Miss Anna 
Snyder; figures 17, 18, and 19 were made by Miss Juliet C. Patten, 
from tracings by Miss Smith, of London. The remaining drawings, 
plates 64, 65, 67, 68, 70, were made by the late Frederick A, Walpole. 
The illustrations, with the exception of figure 14, represent new 
“For full description of the species and reasous for change of name see p. 326. 
