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for the small rock garden, but the varieties lancastriense and 
prostratum may be admitted without much danger. ‘The silvery- 
leaved, pink flowered G. argenteum is the prize of the genus, and 
G. cinereum, with gray leaves and mauve flowers, 1s a close second. 
The overwhelmingly North American genus Penstemon has 
many representatives that bloom this month. P. wnilateralis, from 
the Rocky Mountains, with pink and blue flowers, is among the 
showiest. 
The Sunrose (Helianthemum), sometimes called Rockrose, 1s 
a genus that is most floriferous in poor calcareous soil and a 
sunny situation. We grow many forms, some of them, varieties 
of H. nuimmularium (H. vulgare), are rather too robust for the 
small rock garden. H. canwm, however, 1s never too rampageous, 
only a few inches high, but prodigal of its clear yellow flowers 
displayed over the gray-green foliage. 
Early in the month the Scarlet Mallow, Malvastrum coccineum 
begins to display its flowers of intense copper-scarlet against a 
background of gray foliage. It is a trailer and comes from our 
own north-west. Correvon has high praise for it, which is well 
merited, but he complains “It never seeds with us and we have 
great trouble in finding cuttings on it.” 
From the Pyrenees and Spain comes a trailing Snapdragon, 
Antirrhinum Asarina, that is valuable for planting in rock crevices. 
Although not hardy over winter with us, it usually may be relied 
upon to persist by means of self-sown seeds. 
Other genera that we expect to find in bloom in June are Sedum 
and Sempervivum; dwarf thymes in great variety, Viola; Gino- 
thera; and many others. 
July 
By this time the number of species in bloom in the rock garden 
is on the wane but there is still enough variety to make a visit 
worth while, for, in addition to newcomers, many of those which 
started blossoming in June continue their career into July or even 
BUGE. 
The Golden Ilax (Linum flavum), which by means of. self 
sown seeds has taken possession of a good sized patch of the rock 
garden, provides a brilliant spot of color at this time. This is a 
plant that is undeservedly neglected in our gardens. 
