678 SURIANACEAE, 



2. Amyris elemifera L. An evergreen glabrous shrub or tree, becoming 17 m. tall, 

 with a trunk diameter of about 3 dm. 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 with 

 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. Also in the West Indies. Throughout the year. 



4. Amyris balsamifera 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. cfTRUS 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. vulgai~is. 



Wings of the petiole very narrow or represented by mere margins. 



Leaflets with entire blades : berry with a separable rind and a sweet pulp. 2. C. Aurantium. 



Leaflets with toothed blades : berry with an adherent rind and a very acid pulp. 3. C. Limonium. 

 Petioles wingless and marginless. 



Leaflets 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 Kisso. 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 Aurantium 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 Limonium Risso. The lemon ; with a 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 Limetta Eisso. 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. 



5. Citrus Me~dica L. The citron ; with wingless petioles, large somewhat elongated 

 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 fleshy. 

 Flowers perfect, solitary, or in few-flowered terminal clusters. Calyx of 5 per- 

 sistent sepals. Corolla of 5 imbricated petals with claws. Androecium of 10 

 stamens. Filaments slender, those opposite the petals shorter, or sometimes 

 obsolete. Disk adnate to the base of the calyx or obsolete. Gynoecium of 5 

 distinct carpels opposite the petals. Carpels pubescent, 1-celled. Styles fili- 



