CHAP. XI. CISTA‘CEA. HELIA/NTHEMUM. 349 
We may observe, here, that the rockwork in the Chelsea Botanic Garden 
forms a sort of truncated cone, flattened on the sides, terminating in a small 
basin for water plants ; and it suggests the idea that a helianthemum wall, 
constructed somewhat on the same plan as the strawberry wall of Mr. 
Byers (Gard. Mag., vol. v. p. 438.), would be a very suitable manner of 
growing the species. 
2. 81. H. cane’scens Swt. The canescent-leaved Helianthemum, or Sun 
Rose. 
ddentification. Swt. Cist., t. 51.; Don’s Mill., 1. p. 313. 
Engraving. Swt. Cist., t. 51. 
Spec. Char., §c. Stem suffruticose, branched, diffuse. Branches ascending, 
rather tomentose, canescent. Leaves flat, or hardly revolute at the margins ; 
under surface tomentosely hoary, upper surface greenish glaucous. Lower 
leaves ovate oblong, obtuse; upper ones lanceolate, acute. Stipules linear, 
ciliated, somewhat longer than the footstalks. Calyxes smoothish, but 
with the nerves pubescent. Petals imbricated. (Don’s Mill., i. p. 313.) 
A splendid plant, with reddish crimson flowers; the petals imbricated, and 
having a small orange spot at the base of each. Its native country is un- 
certain, but it was in cultivation in the Fulham Nursery in 1826. Sweet 
considers it as having the darkest-coloured, if not the handsomest, flowers 
of the genus. The flowers are also, he says, very large for the size of the 
plant. It is nearly related to H. rhodanthum, but 1s readily distinguished 
from it by its canescent leaves, and stronger habit of growth. 
2. 82. H. conru‘sum Swt. The confused Helianthemum, or Sun Rose. 
Identification. Swt. Cist., t. 91.; Don’s Mill., 1. p. 313. 
Synonyme. Hz. poliifdlium Dec. Prod., 1. p. 283. 
ngraving. Swt. Cist., t. 91. 
Spec. Char., §c. Stem suffruticose. Branches procumbent, smoothish, rather 
tomentose at the apex. Leaves oblong, ovate, bluntish, rather flat ; under 
surface tomentose, hoary; upper surface glabrous, green, Stipules and 
bracteas linear, green, ciliated. Calyxes striated, smoothish, rather shining. 
Petals imbricate. (Don’s Mill., i. p. 313.) A native of France and Spain, 
and, according to Sweet, cultivated in British nurseries in 1829. Its 
flowers are white, and of a delicate texture. This sort, Sweet observes, is 
generally found, in the nurseries, under the name of H. poliifolium ; but he 
thinks that it has nothing to do with the English species of that name. 
For some reason of this kind,we suppose, it has been called the H. confisum. 
2. 83, H. pancroxta‘tum Swt. The lanceolate-/eaved Helianthemum, or Sun 
Rose. 
Identification. Swt. Cist., t. 100.; Don’s Mill. 1. p. 313. 
Engraving. Swt. Cist., t. 100. 
Spec. Char., §c. Stem suffruticose, much branched, procumbent. Branches 
ascending, smoothish, hoary-tomentose at the apex. Leaves lanceolate, 
acute, with somewhat revolute margins; green and smoothish above, but 
hoary-tomentose beneath. Stipules awl-shaped, linear, longer than the 
footstalks of the leaves. Sepals smoothish, or rather pilose. Petals im- 
bricate. (Don’s Mill. i. p. 313.) A hybrid, found in gardens in 1818, and 
producing white flowers, marked with yellow, from May to August. “ Con- 
fused with H. poliifolium by some botanists,” but readily distinguished by 
its sharp-pointed leaves, which are of a glossy green on the upper side, and 
by its broad imbricated petals. Plants of it were in the Chelsea Botanic 
Garden in 1829, 
2. 84. H. Poturo‘itium Pers. The Polium-leaved Helianthemum, or Sun 
Rose. 
Identification. Pers. Ench., 2. p. 80.; Don's Mill., 1. p. 313. 
Synonyme. Cistus polifdlius Lin. Sp., 745., Smith's Engl. Bot., 1329., Dill, Elth., 175. t. 145. £. 172. 
Daarecingé Smith’s Engl, Bot., t. 1322.; Dill. Elth., 175. t. 145. f 172. 
