328 ARBORETUM AND FRUTICETUM. PART Hl. 
with flowers every year. In the London nurseries, where this species is 
generally called C. ladaniferus, or by its English name of gum cistus, 
plants are from 1s. to 1s. 6d. each. 
# 35. C. LapaNirerus L. The Ladanum-bearing Gum Cistus, or Rock Rose. 
Identification. Lin. Sp., 737. ; Don’s Mill., 1. p. 300. 
Synonymes, Ciste ladanifére, F7.; Ladanum Cisten Rose, Ger. 
Varieties. C. 1. 1. albiflorus Dec. Prod.,i. p. 266., Swt. Cist., t. 94.; Leédon, i., Clus. Hist., i. p. 78. ic.; 
and C. 2. 2 maculatus Dec. Prod., 1. c., Swt. Cist., C.J. 3 plenifdlius Ait. Hort. Kew., iii. p. 305., 
are varieties of this species. 
Spec. Char.,§c. Leaves almost sessile, connate at the base, linear-lanceolate, 
3-nerved, upper surface glabrous, under surface tomentose. Capsule 10- 
celled. Petals imbricate. (Don’s Mill., i. p.301.) A shrub 4ft. high, a 
native of Spain and Portugal, upon hills; introduced into England in 1629, 
and producing large white flowers in June and July. The leaves are lance- 
olate, and nearly sessile, of a deep green; the flowers terminating the 
branches, solitary, white, and large; each flower being from 14 in. to 2in. 
broad. The plant requires a little protection during winter, and was to be 
had in Colvill’s Nursery in 1826. This species, as well as C. Lédon and 
C. créticus, and doubtless various others, produces the resinous exudation 
known as gum ladanum, the mode of gathering which is described in p. 320. 
b. Stigma capitate, small. Style cylindrical, equalling the Stamens in Length. 
« 36 C. CLu‘s1z Dunal. Clusius’s Cistus, or Rock Rose. 
Identification. Dunal. ined., Dec. Prod., 1. p. 266.; Swt, Cist., 32.; Don’s Mill., 1. p. 301. 
Synonymes. C{stus Libandtis 6 Lam. Dict., 2. p.18., Desf. Atl., 1. p. 412.5 C. undulatus Link ; 
Lédon, vii., Clus. Hist., 1. p. 80. ic. 
Engraving. Swt. Cist., t. 32. 
Spec. Char., §c. Erect. Leaves somewhat 3-nerved, linear, with revolute 
margins, under surface canescent. Flowers somewhat capitate. Calyx 
3—5-sepaled, pilose. Sepals ovate, acute. Capsules 5-celled. (Don’s Mill.,i. 
p- 301.) A shrub 2 ft. high, from Spain and Barbary, in 1810. The leaves 
and flowers are smaller than those of any of the other sorts here described. 
The plant forms a handsome and compact bush, and stands the winter well 
in a dry situation. It approaches the nearest to C, monspeliénsis, Plants 
were in the Fulham Nursery in 1826. 
Genus II. 
fal JIL 
HELIA’/NTHEMUM. Tue HeEviantuemum, or Sun Rose. Lin. Syst. 
Polyandria Monogynia. 
Identification. Tourn. Inst., 248. t. 128.; Gert. Fr., 1. p. 371. t. 76.; Dec. Fl. Fr., 4. p. 815.; Prod., 
1. p. 265.; Don’s Mill., 1. P: 301. f 
Synonymes. Cfsti species of Lin.; Heliantheme Sonnen Gurtel, Ger. a 
Derivation. From hélios, the sun, and anthemon, a flower ; because the flowers open with the rising 
of the sun in the morning, and the petals fall off with the setting of the sun in the evening. The 
flowers of Helianthemum, as well as of Cistus, only last for a few hours when the sun shines ; 
and if the weather is dull, and the sun does not make its appearance, the flowers do not open, but 
remain unexpanded. Should this continue for several days together, they will decay in the bud. 
Gen. Char. Calyx of 3—5 sepals; when 3, these are equal, and disposed in a 
single series ; but, when 5, they are unequal, and disposed in a double one; 
the two outer sepals are usually smaller than the inner ones, very rarely 
larger. Petals 5, usually regularly denticulated at the top. Stgma 
capitate. Style sometimes almost wanting, sometimes straight, sometimes 
oblique, and sometimes bent at the base. Ovary triquetrous. Capsule 
3-valved; valves with a narrow dissepiment, or a seminiferous nerve 
in the middle of each. Seeds angular, smooth. Albumen mealy. 
Embryo uncinately inflexed— Erect or trailing herbs, subshrubs, or 
shrubs. Leaves opposite and alternate, with or without stipules, 3-nerved 
or feather-nerved. Pedicels usually furnished with bracteas at the base 
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