56 Cistinee—Helianthemum. 
genus it is sometimes referred. Leaves ovate-lanceolate, sessile, 
very hairy. Flowers bright yellow with a brown blotch at the 
base of each petal. A Summer-flowering plant from Portugal. 
2. H. vulgare, Rock Rose.—This is the common. native 
species, frequently seen in gardens, and one of the most widely 
distributed, being found from Arctic Europe to both shores of 
the Mediterranean. A dwarf shrub with opposite linear-oblong 
hairy leaves and usually yellow flowers, but varying in dif- 
ferent shades to deep red. There is also a double-flowered 
variety. H.crdcewm, rosewm, surrejanum, grandiflorum, ete., 
are simply varieties of this species. 
There are numerous other species, few of which are seen in 
cultivation ; but we might mention H. pulveruléntwm and 
H. macranthum, with white flowers; H. formosum and H. 
Tuberaria, an herbaceous species with ribbed leaves and yellow 
flowers with a purple blotch at the base of each petal. 
2. CISTUS. 
Mostly handsome erect shrubs from Western and Southern 
Europe, North Africa, and the Atlantic islands. Leaves oppo- 
= site, entire or toothed, ob- 
long or lanceolate. Flowers 
large and showy, but very 
evanescent, and not opening 
in dull weather. Sepals 3 to 
5. Petals white with a yel- 
low or purple blotch at the 
base, or rose with a yellow 
spot at the base, never 
wholly yellow. Technically 
distinguished from Helidm- 
themuwm by the capsule be- 
ing usually 5-valved, and 
the flowers cymose or soli- 
tary,seldomracemose. Ety- 
mology from the Greek name 
a xiatos. Some of the species 
s are tolerably hardy in the 
South of England. 
1. CO. ladaniferus (fig. 
Fig. 41. Cistus ladaniferus. (4 nat, size.) 41).—This has sessile 3- 
nerved lanceolate leaves, glutinous above, and covered with a 
