Zou 
ing them with a reasonable degree of certitude, and on the whole 
their flowers have greater variety and are more attractive. Sedum 
acre is one of our worst weeds, but we tolerate it because it makes 
mats of bright green foliage topped in late June and early July 
with brilliant yellow flowers. S. cerulewm, the opposite of acre 
in almost every respect, is an annual with fat leaves and pale blue 
flowers. S. album, green leaves, white flowers; S. altissimum 
eray leaves, creamy flowers; S. dasyphyllum, very dwarf, gray 
leaves with white or pinkish flowers; S. spurium and its varieties 
(var. coccineum is the best) are among the Sec 
July. 
Mentha Requieni should be planted in a moist situation, near a 
walk so that it may, occasionally (not too often), be stepped 
on to enable one to enjoy its delicious aromatic fragrance. It 1s 
a Lilliputian mint closely carpeting the ground, and its violet 
colored flowers, in late June or early July, are so tiny that even 
the observing are to be excused if they fail to notice them. 
A delightful form of the Virginia Spiderwort (Tradescantia 
virginiana, Fig. 26), with large, pale blue flowers, made its ap- 
pearance in the Rock Garden a few years ago. We have no record 
of ever having planted it there. Theoretically it should be up- 
rooted, because it does not belong, but it fits in so beautifully in 
its self-chosen position that no one has had the heart to banish it. 
The Alpine Poppy (Papaver alpinum) is a miniature edition of 
the popular Iceland Poppy. It is not very permanent and_ re- 
quires a limy, gritty soil. It is so delicate and graceful and there 
is such a wide range of colors in its various forms that it 1s well 
worth fussing with. 
The nodding blue flowers (it is the sepals that provide the color) 
of Clematis integrifolia are usually at their best early in July. 
This Clematis is herbaceous in character, erect, and about two 
aeary 
ums blooming in 
feet high. It is all too seldom seen in gardens and may be grown 
in the perennial border as well as in the rock garden. 
From the far away Himalayas comes the Nepal Cinquefoil 
(Potentilla nepalensis). This species is valuable for its late and 
long blooming habits, and its cheery flowers of cherry red. 
Mazus reptans (sometimes sold erroneously as M. rugosus), 
also from the Himalayas, continues to produce its flowers of violet 
