OP ORNAMENTAL EXOTIC PLANTS. 
13 
almost in clusters. The flowera of most of the species are yellow, but some are white and some pink. The 
plants are generally of a much smaller size than those belonging to the genus Cistus, and their stems are 
usually trailing instead of being erect. The name of Helianthemum is from two Greek words signifying flower 
of the sim, because the petals of most of the species unfold when the sun rises, and drop before it sets in the 
evening. 
1.— HELIANTHEMUM FORMOSUM Dun. THE BEAUTIFUL HELIANTHEMUM, OR SUN-ROSE. 
Synonyme.' — Cistus fonnosus Si/rns. 
Engravings. — Bot. Mag., t. 264; and our fig. 3, in PI 2, under 
the name of Cistus formosus. 
Specific Character. — Erect. Branches tomentosely villous, ca- 
nescent. Leaves on short footstalks, ohovate, lanceolate, tomentosely 
villous, younger ones hoary. Peduncles and calyx villous. Calyx 
of three sepals. 
Description, &c. — This very beautiful plant is a native of Portugal, whence its seeds were introduced in 1780. 
It is very nearly hardy, and it may be grown in the open border all the year if it can be protected from the spring 
frosts ; but it flowers much better under cover, and particularly when it is grown in a pot, which may be done, even 
when the plant is tkree or four feet high, without its sustaining any injury. 
2.— HELIANTHEMUM ALGARVENSE Dun. THE ALGARVE HELIANTHEMUM. 
Synonyme. — Cistus Algarvensis Sims. 
Engravings.— Bot. Mag., t. 627; Sweet’s Cist., t. 40 ; and our 
fig. 4, in PI. 2, under the name of Cistus Algarvensis. 
Specific Character. — Stem branched. Leaves sessile, ovate- 
lanceolate, obtuse, hoary on the under surface ; upper surface green, 
pilose. Peduncles somewhat panicled, pilose. Calyx of three sepals, 
acute, hairy. ((?. Don.) 
Description, &c. — This very pretty little plant is a native of Algarve, a province in the south-west of Portugal. 
The flowers ai’e small, but very pretty, and they are produced in great abundance. The stem of the plant is 
trailing, and only the flower-stems raise themselves erect. The flowers appear in July and August, but they 
rarely ripen seed ; therefore, the plant is generally propagated by cuttings. It is tolerably hardy, and may be 
grown on rockwork in the open air dm’ing summer. 
OTHER SPECIES OF HELIANTHEMUM. 
These are very numerous, but very few of them are found in British gardens, and very often the same plant is 
known under several different names. H. umhellatum, with white flowers, and the flowers in a kind of umbel, 
and H. candidum, with yellow flowers, and leaves covered with a white down, are perhaps among the most common. 
Almost all the kinds of Helianthemum ripen their seeds, and consequently new plants may be raised from 
them ; or cuttings of the ripe wood may be taken off in August and September, when they will strike readily. 
Nearly all the greenhouse species only require protection in the winter, and may be planted on rockwork during 
the summer months. 
GENUS III. 
HUDSONIA Lin. THE HUDSONIA. 
Lin. Syst. POLYANDRIA MONOGYNIA. 
Generic Character. — Petals five. Stamens from fifteen to thirty; 
filaments filiform ; anthers small, longitudinally dehiscent. Style 
straight, simple, equalling the stamens in length. Stigma simple. 
Capsule one-celled, three-valved, one to three-seeded, oblong or obo- 
vate, coriaceous, smooth or pubescent. Seeds granulated. Embryo 
immersed in a homy albumen. (G. Don.) 
Description, &c. — There are only five species belonging to this genus, two of which have been introduced. 
They are pretty little Heath-like plants with yellow flowers, natives of New Jersey and Virginia in North America ; 
