204 XXXV. AURANTIACEE. | CiTRUvs. 
Orver XXXIV. RUTACEA.—Rveworrs. 
Herbs, or generally shrubs and trees, with punctate lvs. and no stipules. 
Fis. perfect. Sep.4—5. Pet, 4—5, rarely 0. . : f 
Sta. as many, or twice or thrice as many as petals, inserted on the outside of a cup-like disk. 
Ova. 3—5-lobed, 3—5-celled ; styles united or distinct only at base. 
Fy. usually separating into its component, few-seeded carpels. 
Genera 47, species 400, usually inhabiting the warmer parts of the meg ig zone on the Eastern con- 
tinent, and the equatorial parts of S. America. They are characterized by a powerful odor and intense 
iene, often febrifugal and anthelmintic. Dictamnus abounds in a volatile oil, diffusing an inflam- 
mable gas. 
Genera. 
Sepals permanent. Petalsequal. . . . + + «© e «© »« «6 e« « Ruta. 4 
Sepals deciduous. Petals unequal. . A 3 = ~. te: le! as!) “el Aly ep lidepeuppanese. 
1; RAE 
Calyx of 4—5 sepals united at base; petals 4—5, concave, obo- 
vate, distinct ; torus surrounded by 10 nectariferous pores; stamens 
10; capsule lobed.—% Herbaceous or shrubby, mostly European. 
R. GRAVEOLENS. Common Rue.—Suffruticose, nearly glabrous; Jvs. 2 and 3- 
pinnately divided, segments oblong, obtuse, terminal ones obovate-cuneate, all 
entire or irregularly cleft; fls. terminal, corymbose ; pet. entire-—Native of 8. 
Europe. Stem branched, fhigh. Leafiets 6—10’” by 2—4’, conspicuously 
dotted. Corolla yellow, 6’ diam. Jn.—Sept. + 
2, DICTAMNUS. 
Calyx of 5 deciduous sepals; petals 5, unguiculate, unequal ; fila- 
ments declinate, with glandular dots; capsules 5, slightly united —2% 
Herbs, native of Germany. 
D. atzus. Willd. (and D. Fraxinella. Link.) Fraxinella—®St. simple ; 
ws. pinnate, the rachis more or less winged; fs. in a large, terminal, erect pan- 
icle—In gardens. Stems 1—2f high. Flowers showy, white, varying to rose- 
color and purple. The whole plant emits a lemon-scented, aromatic, volatile 
oil, which is so abundant in hot weather as to render the air around it inflam- 
mable. + 
6. rubra. Flowers purple; rachis of the leaves winged. f 
OrpER XXXV. AURANTIACE A.—Onranezs. 
Trees or shrubs, glabrous, abounding in little transparent receptacles of volatile oil. 
Lvs. alternate, articulated with the petiole which is frequently winged. 
Cal.—Sepals 3—5, united into a short; urceolate or campanulate cup. 
Cor.—Petals 3—5. : : : ; 
Sta. as many as the petals, or some multiple of their number, in a single row, hypogynous. 
Ova. compounded of several united carpels. Style 1. ques 
Fr.—A berry (orange), many-celled, pulpy, covered with a thick rind. 
Sds. attached to the inner angle of each carpel. Albwmen 0. 
Genera 20, species 95, nearly all natives of tropical Asia, and are naturalized throughout all tropical 
regions, and cultivated in all civilized countries for their beauty and fragrance, both of flowersand fruit. 
Properties.—These fruits contain free citric. and malic acid, and their pulp is grateful to the taste. 
The rind contains an aromatic, volatile oil, which is tonic and stomachic. The rind of the lime yields 
the oil of Bergamot, and the flower of the orange the oil of Neroli. 
CITRUS. 
Gr. xcrpia, the citron; the fruit of one of the species. 
Sepals and petals in 5s; anthers 20, or some other and higher 
multiple of 5, versatile, the connectile articulated to the filament; 
filaments dilated at base, polyadelphous ; berry 9—18-celled—A no- 
ble genus of trees and shrubs, all tropical, combining in its species, beauty 
of form, with shining, ever-green foliage, odoriferous flowers, and fragrant 
and delicious fruit. 
1. C. Limonum. Lemon Tree.—Petioles somewhat winged, articulated with 
the lamina (which is thus shown to be the terminal or odd leaflet ef a reduced 
