saxatile. It is of easy cultivation and succeeds in almost any 
kind of soil, but it must be exposed to sunshine. The columbines 
begin to bloom this month. Aquilegia canadensis , our common 
columbine, grows wild in rocky places over a large portion of the 
country east of the Rocky Mountains. There is a large group of 
the Rocky Mountain columbine, Aquilegia caerulea, by the side 
of the upper walk. It is difficult to get the true plants of this 
species with characteristic blue and white flowers, and ours show 
considerable color variation, probably due to hybridization with 
other species. The double-flowered form of Arabis albida 
blooms this month and remains in good condition a long time. 
This species is frequently sold under the name of A. alpina , a 
similar species but not so showy as A. albida. A. aubrietioides, 
a species with bright pink flowers, also blooms about this time. 
It is rather cranky and not so amenable to cultivation as the 
other kinds. Other plants that may be expected to bloom in April 
are the mountain spurge, Pachysandra procumbens, and several 
forms of Aubrietia deltoidea. 
In the early part of May, Veronica repe?is, a diminutive speed- 
well, is covered with pale blue blossoms that almost completely 
hide the creeping stems. An interesting little willow herb, 
Epilobium nummulariaefolium , hailing from the mountains of 
New Zealand, shows its charming foliage to good effect about 
this time This is an excellent carpeting plant, clinging close 
and completely hiding the ground. It has made itself thoroughly 
at home, and self-sown seedlings have sprung up all over the 
rockery. Indeed, there is a possibility that it may become some- 
thing of a nuisance and necessitate rigorous repression. 
Toward the middle of May great activity prevails and many 
plants come into bloom, some of which are mentioned below. 
Gypsophila ceraslioidcs, a very dwarf baby’s breath from the Him- 
alayas, has large white flowers veined with pink. This occupies 
a position on the left at the entrance of the northernmost walk. 
We have two forms of Gypsophila repens , which grows wild in the 
Alps and Pyrenees. One of these, the larger kind, is reminiscent 
of the common baby’s breath of our borders. Achillea agerati- 
folia, from the hills of Greece, and A. serbica , from rocky Serbia, 
maintain their flowers in good condition well into June. These 
are milfoils with large white flowers, and silvery foliage that is 
attractive throughout the larger part of the year. Mazus repta?is, 
a creeping figwort from the Himalayas, is sometimes killed off 
during hard winters, but comes up smiling in the spring from 
self-sown seeds. It has pale purple flowers, of which a few are 
always in evidence from May until frost. A?idrosace sarmentosa, 
and allied Himalayan rock jasmines, with pink flowers in umbels, 
may be found blooming in the “moraine.” Erinus alpi?ius, which 
blooms from April to June, grows in small patches in several 
