HARDY EXOTIC FLOWERING PLANTS. 145 
one sees conspicuous among herbaceous vegetation in America, would 
produce very showy effects in autumn, and might perhaps more 
particularly interest those who only visit their country seats at that 
time of year. The Silphiums, especially the compass plant (8. 
laciniatum), and the cup plant (S. perfoliatum), are allied in general 
aspect and character to the Helianthuses, and are suitable for the same 
purposes, 
St. John’s Wort, Hypericum.—The well-known St. John’s wort 
has already in many places made good its claim as a wilderness plant, 
and there is scarcely one of its numerous congeners which will not 
thrive in wild and rough places, in any soil. They have all the same 
bright yellow flowers as the St. John’s wort, and are nearly all taller. 
Some of the newer kinds have the handsome large flowers of the St. 
John’s Wort. It should be noted that the common St. John’s Wort so 
exhausts the soil of moisture that it may be the cause of the death of 
trees, and should therefore be looked after. Many places have too 
much of it, as they have of the common Laurel. 
Rocket, Hesperis—The common single Rocket (Hesperis mat- 
ronalis) is a showy useful plant in copse or shrubbery, and very easily 
raised from seed. 
Evergreen Candytuft, [beris—Compact little evergreens, form- 
ing spreading bushes from 3 inches to 15 inches high, and sheeted with 
white flowers in spring and early summer. There are no plants more 
suitable for naturalisation in open or bare places, or, indeed, in any 
position where the vegetation is not strong enough to overrun them. 
They, however, attain greatest perfection when fully exposed to the 
sun, and are admirable for every kind of rocky or stony ground and 
banks. 
Iris, Flewr de Lis—These plants, once so well known in our gardens, 
rivalling (or rather exceeding) the lilies in beauty, are varied and 
numerous enough to make a wild garden by themselves. The many 
beautiful varieties of germanica will grow in almost any soil, and may 
be used with good effect in woods, copses, by wood walks, or near the 
margin of water. JI. sibirica, rather a common kind, will grow in the 
water ; and, as this is not generally known, it is worthy the notice of 
any one taking an interest in aquatics. It is probable that others of 
the beardless kinds will also do well with their roots below the water, 
and if so, they will one day much improve the rather poorly adorned 
margins of artificial waters. On the other hand, I. pumila, and the 
varieties of germanica, are often seen on the tops of old walls, on 
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