678 SURIANACEAE 
2. Amyris elemifera L. An evergreen glabrous shrub or tree, becoming 17 m. tall, 
with a trunk diameter of about 3dm. Leaflets 1-3, the blades firm, ovate or elliptic-ovate, 
often somewhat rhombic, 2-8 cm. long, obtuse, acute or acuminate, undulate, obtuse or 
truncate at the base, finely reticulated: panicles 3-8 cm. long, short-peduncled : pedicels 
4-6 mm. long: sepals ovate, nearly 1 mm. long: petals nearly oblong, 2.5-3 mm. long, 
yellowish white, obtuse, spreading or recurved : drupes globose, 4-6 mm. long, black wit 
a bloom, aromatic. 
In sand, southern peninsular Florida and the Keys. Also in the Bahamas and the West Indies, 
Summer to winter. 
3. Amyris maritima Jacq. A tree resembling A. balsamifera, but taller, and with 
glabrous branchlets. Leaflets 3, the blades shining beneath: ovary glabrous: drupes 
globose, 6-8 mm. in diameter. 
In sand, Key West, Florida. Alsoin the West Indies. Throughout the year. 
4. Amyris balsamífera L. A branching shrub or small tree, sometimes 4 m. tall, 
with a maximum trunk diameter of about 2.5 dm., the branchlets slightly pubescent. 
Leaves persistent: leaflets 3-5, the blades ovate-lanceolate, 5-8 cm. long, attenuate-acumi- 
nate, dull beneath, entire: inflorescence resembling that of A. elemifera: ovary pubescent: 
drupes obovoid to elliptic-oval, 6-13 mm. long, black beneath the bloom. 
In sand, southern Florida. Also in the West Indies and South America. Throughout the year. 
8. CITRUS L. 
Shrubs and trees, with more or less spinescent branches, pervaded by a fragrant vola- 
tile oil. Leaves persistent: blades 1-foliolate, leathery: petiole often winged. Flowers 
perfect, regular, axillary. Sepals united into a cup-like calyx. Petals 5 or rarely 4-8, 
white, at least within, deciduous. Stamens 20-60: filaments inserted around an annular 
or cup-like disk. Ovary several-celled, superior: styles united, deciduous. Ovules several 
in each cavity. Berries various, with a bitter oily rind. Seeds pale, several in each cavity. 
Endosperm wanting. Embryo with fleshy cotyledons. Various species and varieties of 
this genus are cultivated, and either spontaneous or naturalized in the Gulf States : 
Petioles with wings or margins. 
Wings of the petiole very broad. 1. C. vulgaris. 
Wings of the petiole very narrow or represented by mere margins. à 
Leaflets with entire blades: berry with a separable rind and a sweet n 2, C. Aurantium. 
. Leaflets with toothed blades: berry with an adherent rind and a very acid pulp. 3. C. Limomum. 
Petioles wingless and marginless. R 
Leafiets with toothed blades : berries with a thin rind. 4. C. Limetta. 
Leaflets with entire blades: berries with a very thick rind. 5. C. Medica. 
1. Citrus vulgaris Risso. The bitter-sweet orange ; with a broadly winged petiole, a 
subglobose berry, an orange-colored and very fragrant rind and a bitter-sweet or bitter 
and sour pulp. 
Thoroughly naturalized in peninsular Florida. 
2. Citrus Aurántium L. The sweet orange; with a narrowly winged petiole, a sub- 
globose berry, an orange-colored rind and a sweet pulp. 
Widely cultivated and spontaneous in peninsular Florida and others of the Gulf States. 
3. Citrus Limónium Risso. The lemon; witha narrowly winged petiole, a more or 
less elongated berry, a pale yellow rind and a very sour and acid pulp. 
Cultivated and spontaneous in peninsular Florida. 
4. Citrus Limétta Risso. The lime; with wingless petioles, small, nearly globular 
berries, a pale thin rind and a sweetish somewhat acid pulp. 
Cultivated and naturalized in peninsular Florida. oe 
5. Citrus Médica L. The citron; with wingless petioles, large somewhat elongat 
berries, a very thick adherent rind and a slightly acid pulp. 
Sparingly cultivated and spontaneous in peninsular Florida. 
FAMILY 9. SURIANACEAE Lindl. SuRIANA FAMILY. 
Shrubs of tropical coasts. Leaves alternate: blades narrow, rather 2 
Flowers perfect, solitary, or in few-flowered terminal clusters. Calyx of 5 d 
sistent sepals. Corolla of 5 imbricated petals with claws. Androecium © = 
stamens. Filaments slender, those opposite the petals shorter, or somo 
obsolete. Disk adnate to the base of the calyx or obsolete. Gynoecium we 
distinct carpels opposite the petals. Carpels pubescent, 1-celled. Styles 
