36 
PARK AND CEMETERY. 
GARDEN PLANTS-THEIR GEOGRAPHY., XIX. 
ROSALES, (C.) 
THE GENISTA, ROSA AND DROSERA ALLIANCE. 
The group of plants which follow would, 
1 think be better distinguished in gardens by 
the term saxifragales. For the most part they are 
sufficiently distinct from roses, often humble, and 
widely diffused over the world. While there is a 
good selection of hardy deciduous shrubs for northern 
gardens, large numbers of handsome shrubs and 
even trees of an evergreen habit are adaped to the 
warmer regions. Hydrangeas, Escallonice , and 
C union ice, each embrace genera of considerable 
beauty. Callicoma, some Geissois, Ceratopetalum 
Caldcluvia, Davidsonia, and various Canonias may 
be mentioned as examples. The tribes Saxifragcce, 
Crassulece, and Drosserese, often present extremely 
humble species, now and then varied by bushy plants 
such as Drosophyllum Lusitanicum, and the South 
African Roridula. Very many are Alpines only 
adapted to the higher mountains, and cultivation, 
perhaps in sphagnum. 
Astilbe has 6 species from the Himalayas, Japan, 
Java and North Eastern America. They sometimes 
caricature species of the Aruncus section of spirea 
strongly, but botanists say they are distinct, and 
there doesn’t appear to be anything in the way of a 
bridge in this case. A. Chinensis (known as Jap- 
onica) has a variegated, and also an autumn flower- 
ing form. European hybridists are at work on 
them too, and if they should produce a lot of varie- 
ties bridging the gap between Astilbe, and Spirea, 
what then? Probably many of our scientists would 
rather seek the missing-link in the coal measures. 
Saxifraga has 180 species, natives of the tem- 
perate and Arctic regions of the northern Hemis- 
phere, and of the Andes. They are loaded with 
generic and specific synomony, but as they are not 
very much used in gardens perhaps it doesn’t mat- 
ter! Several are showy, both in flower and foliage. 
Tiarella has 5 species 3 of which are North 
American and the others Himalayan. The Eastern 
species which we figure is widely diffused through 
the southern mountains to New England and west- 
HYDRANGEA QUERCJ FOLIA. 
HYDRANGEA HORTENSIA, VAR. HYDRANGEA PUBESCENS. 
wards to Indiana. It is a woodland plant with white 
flowers, and is inserted chiefly to compare it with 
the remarkable plant Gunnera Chilensis, mentioned 
further on. 
Hcuchera has 15 or 20 mostly white flowered 
species, all North American, and called “Alum 
root.” H. sanguinea from the southwest has proved 
itself a pretty garden plant. It is found at eleva- 
tions of about 5000 feet growing on limestone 
ledges. 
Parnassia, grass of “Parnassus” is a somewhat sing- 
ular genus of 14 species all natives of the northern 
hemisphere and ascending the mountains of India 
to great altitudes. Some grow in dry places and 
some grow in wet. Some are very small, some 
much larger, with flower scapes a foot or more 
high. They are worth naturalizing in a garden near 
to Deutzias and “mock oranges” just for compari- 
son. There are three or four native species. 
Hydrangea has 33 species of shrubs and climbers 
from the Malayan Archipelago, the Himalayas, 
Eastern Asia and North America. They are often 
very handsome garden shrubs, quite mutable in 
color from pink to blue, and sometimes attaining 
to great popularity as forced florists flowers. From 
central New Jersey southwards the Japanese varie- 
ties of H. Hortensia are fairly hardy garden shrubs, 
and when given good moist soil under a shady north 
wall are often magnificent, loosing theirflower buds 
only in seasons of protracted severity. Strawing 
them up will sometimes prevent this in the open 
