186 ARBORETUM ET FRUTICETUM BRITANNICUM. 
also more or less tinged with red. The fruit is round, not succulent, and 
somewhat furrowed ; at first green, and afterwards reddish; but black, or of a 
very dark blue, when ripe. The leaves and flowers emit a very resinous odour, 
which spreads to a considerable distance, more especially at sunset, when 
the dew is falling, after « very warm day. The substance called Venice 
or Chian turpentine is the resin which exudes from this tree. In British 
gardens, the tree is not yery common, though it is generally considered as the 
‘hardiest of the genus; and, with P. vera, may be planted in warm-sheltered 
situations in the open border. 
2 3. P. Lenti’scus L. The Mastich Tree. 
Identification. Lin. Spec., 1455. ; Dec. Prod., 2. p. 65. ; Don’s Mill., 2. p. 66. 
Synonyme. Corno capra, Ital. 
Engravings. Woodv. Med. Bot., t. 152.; and our fig 280. 
Spec. Char., §c. Evergreen. Leaves abruptly pinnate ; leaflets 8, lanceolate ; 
petiole winged. (Dec. Prod.) An evergreen tree. Southern Europe, 
Northern Africa, and the Levant. Height 20 ft. Introduced in 1664. 
Flowers green; April and May. Fruit brownish ; ripe in October. 
Varieties. 
£ P. L. 2 angustifolia Dec., P. massiliénsis Mill. Dict., P. angustifolia 
massiliénsis J’ourn., has leaflets almost linear, and the tree seldom 
exceeds 10 ft. in height. 
# P. L. 3 chia N. Du Ham. iv. p. 72.; P. 
chia Desf. Cat. Hort. Par.— A native of 
Scio, where it produces the mastich. 
The species bears a general resemblance to the 
two preceding ones, in summer, when they are 
clothed with foliage ; but it differs from them in 
being evergreen, and in having the leaves much 
smaller. The leaves have sometimes 5 leaflets on 
each side; and the petioles are so much winged 
as to appear like pinnz. The tree in the South 
of Europe, and the North of Africa, is cultivated 
in gardens, as well as found in a wild state; but 
in British gardens it is not so hardy as P. Te- 
rebinthus, and north of London should always 
be planted against a wall. 280. Pistacia Lentiscus. 
Other Species of Pistacia. — P. atléntica Desf., a deciduous tree from Mount 
Atlas, is said to have been introduced in 1.790, but it requires the protection 
of a frame or green-house. 
Genus I. 
cn 
RHU’S L. Tse Ruus, or Sumacu. Lin. Syst. Pentandria Trigynia and 
Dice‘cia Pentandria. 
Identification. Lin. Gen.,369.; Lam. Ill., t. 207.; Kunth Gen. Tereb., p. 5.; Dec. Prod., 2. p. 66. 5 
Don’s Mill., 2. p. 61. and p. 69. 
Synonymes. Sumach, Fy. and Ger.; Ru, Ital. 
Derivation. From rhoos, or rhous, Greek, or from rhudd, or rud, Celtic, red; in allusion to the 
colour of the fruit and leaves of some of the species in autumn. Others derive Rhiis from the 
Greek verb ried, 1 run, from the habit of the roots running and spreading under ground to a 
eoneinerable distance from the tree. Sumach is derived from Simagq, the Arabic name of the 
plant. 
Gen. Char, Sexes hermaphrodite, diccious, or polygamous. Calyx small, 
5-parted, persistent. Petals ovate, and inserted into a calycine disk, or 
into the calyx. Stamens 5, inserted into a calycine disk. Ovary single, 
