RUBIACEAE. 409 



1. Rachicallis americana (Jaeq.) Hitchc. Rep. Mo. Bot. Gard. 4: 92. 1893. 



Hedyotis americana Jacq. Enum. 12. 1760. 

 Hedyotis rupestris Sw. Prodr. 29. 1788. 

 Eachicallis rupestris DC. Prodr. 4: 434. 1830. 



Rigid, erect, or prostrate, the short stout twigs densely woolly,, bearing 

 the leaves in tufts at the ends. Leaves bright green, 4-9 mm. long, about 1 

 mm. wide, thick, grooved on the back, glabrous, sharply mucronate; stipules 

 broadly ovate, mucronate, densely pubescent and eiliate; corolla 5-6 mm. long, 

 villous-pubescent, its obtuse lobes about one third as long as the tube. Plant 

 fragrant when dry. 



Maritime rocks and coastal coppices, throughout the archipelago: Cuba; His- 

 paniola ; Jamaica ; the Caymans : Cozumel. Reported from Bermuda, perhaps erro- 

 neously. HOG-BUSH. SANDFLY-BUSH. SALTWATER-BUSH. SEA-WEED. WILD THYME. 



3. EXOSTEMA Rich. ; H. & B. PI. Aeq., 1: 131. 1808. 



Shrubs or trees, with opposite petioled leaves, deciduous stipules, and 

 solitary or panicled flowers. Calyx-tube cylindric to turbinate, with 5 linear 

 lobes. Corolla salverform, the slender tube elongated, the limb with 5 long 

 imbricated lobes. Stamens 5, borne near the base of the corolla; filaments 

 filiform, long; anthers narrowly linear, basifixed, exserted. Ovary 2-celled; 

 style filiform, exserted ; ovules numerous in each cavity. Fruit a 2-valved 

 capsule, many-seeded; seeds broadly winged. [Greek, exserted stamens.] 

 Thirty species or more, natives of tropical America. Type species: Exostema 

 parviflorum A. Rich. 



1. Exostema caribaeum (Jacq.) R, & S. Syst. 5: 18. 1819. 

 Cinchona caribaea Jacq. Enum. 16. 1760. 



A glabrous shrub or small tree up to 8 m. high, with a trunk sometimes 

 1 dm. in diameter, the bark bitter. Leaves oblong-lanceolate to elliptic, rather 

 thin, 3-8 cm. long, 1-3 cm. wide, acuminate or acute at the apex, narrowed at 

 the base, the midvein prominent, the few lateral veins obscure,, the slender 

 petioles about one-fourth as long as the blades ; stipules broadly ovate, acumi- 

 nate, about 1.5 mm. long; flowers solitary in the axils; peduncles slender, 

 about as long as the calyx; calyx clavate-cylindric, 4-5 mm. long, its teeth 

 short ; corolla white or pinkish, its tube 2-3 cm. long, slightly longer than 

 the lobes; anthers long-exserted; capsule oblong, smooth, woody, 10-15 mm. 

 long. 



Coppices, pine-lands and scrub-lands, throughout the archipelago from Abaco, 

 Great Bahama and Andros to Caicos Islands : Florida ; Cuba to Anegada, St. Martin 

 and Grenada ; Jamaica ; Central America and northern South America. PRINCEWOOD. 



4. CASASIA A. Rich, in Sagra, Hist. Cub. 11: 9. 1850. 



Shrubs or trees, with terete branches. Leaves opposite, leathery; stipules 

 deciduous. Flowers perfect, in short-peduncled cymes. Calyx turbinate or 

 campanulate, truncate or with 5 or 6 obtuse sepals, persistent. Corolla white 

 or yellow, salverform or nearly rotate, pubescent in the throat, its lobes 5 or 6, 

 spreading, contorted. Stamens 5 or 6, adnate to the mouth of the corolla- 

 tube; anthers sessile. Disk cup-like. Ovary 1-2-celled; styles stout. Ovules 

 numerous in each cavity. Fruit a thick pulpy berry. Seeds numerous, angled, 

 flattened, the testa somewhat fibrous. [In honor of Luis de las Casas, Cap- 

 tain General of Cuba.] About 8 species, natives of Florida and the West 

 Indies. Type species: Casasia calopliylla A. Rich. 



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