EHIZOPHORACEAE 833 



1. Aoomonis dichdtoma (Poir.) Sarg. A shrub or tree, reaching a height of 8 m., 

 with a maximum trunk diameter of about 1.5 dm., the bark smooth but finally separating 

 in small scales. Leaf-blades parchment-like or rather leathery at maturity, oblong to cuneate 

 or obovate-cuneate, 2-4 cm. long, revolute, rarely acute ; petioles 1-2 mm. long, silky or 

 glabrous at maturity : peduncles sometimes surpassing the leaves, silky, at least when young : 

 terminal flowers sessile in the forks of the cyme-branches : calyx tomentose ; sepals 4, ovate, 

 obtuse : corolla 4-5 mm. broad, white : petals fully twice as long as the sepals : fruit oval 

 or subglobose, 6-7 mm. long, reddish brown, oblique, crowned with the calyx. 



On sandy shores, peninsular Florida and the Keys. Also in the West Indies. Spring. 



3. PSIDIUM L. 



Shrubs or trees. Leaves opposite : blades leathery, prominently ribbed. Flowers 

 solitary or several together on axillary pedicels. Sepals 4-5, irregularly separating from 

 each other. Petals 4-5, relatively large. Stamens very numerous. Ovary inferior, 2-5- 

 celled or sometimes 7-celled. Ovules numerous in each cavity of the ovary. Berry pulpy, 

 often aromatic and somewhat acid. Seeds numerous. GUAVA. 



1. Psidium Guajava Raddi. A shrub, or a small tree sometimes 5 m. tall, with 

 pubescent 4-angled branchlets. Leaf-blades firm-leathery, oblong or nearly so, 4-8 cm. 

 long, mostly obtuse, pubescent beneath, with prominent rib-like lateral nerves, short-peti- 

 pled : sepals 1-1.5 cm. long: petals 1.5-2 cm. long : berries globular or pyriform, 3-6 cm. 

 in diameter. 



In fields and thickets, peninsular Florida and southern California. Introduced from the tropics. 



4. CHYTRACULIA P. Br. 



Shrubs or trees, somewhat aromatic. Leaves opposite : blades often leathery, feather- 

 nerved. Flowers inconspicuous, numerous, in clustered open cymes at the ends of axillary 

 peduncles. Sepals persistently united into a cap-like body. Corolla wanting. Stamens 

 numerous, inserted in many series : filaments filiform, distinct : anthers opening lengthwise. 

 Ovary sessile, 2-3-celled. Ovules 2 in each cavity, side-by-side. Berry shorter than the 

 remains of the hypanthium. Seeds usually 1-2. STOPPER. 



1. Chytraculia Chytraculia (L. ) Millsp. A shrub or tree, sometimes 8 m. tall, with 

 a maximum trunk diameter of about 1 dm., the bark smooth, or with broad scales in age. 

 Leaf -blades elliptic or nearly so, 3-8 cm. long, acuminate at both ends or merely acute at 

 the base, deep green and lustrous above, pubescent beneath, at least when young ; petioles 

 5-12 mm. long : panicles 5-10 cm. long and about as broad : hypanthium pubescent with 

 red hairs : sepals suborbicular, deciduous : corolla wanting : fruit subglobose or oval, 5-7 

 mm. in diameter, reddish brown. 



In hammocks, southern peninsular Florida and the Keys. Also in the West Indies and Mexico. 



FAMILY 6. RHIZOPHORACEAE Lindl. MANGROVE FAMILY. 



Maritime shrubs or trees, with terete branches and usually glabrous foliage. 

 Leaves usually opposite, with stipules : blades leathery. Flowers perfect, soli- 

 tary in the axils or variously disposed in spikes, racemes, cymes or panicles. 

 Calyx of 3-4 valvate sepals. Corolla sometimes showy. Petals as many as the 

 sepals, 2-cleft or lacerate. Androecium of twice or 4 times as many stamens as 

 the petals, or rarely of the same number, inserted at the base of a more or less 

 conspicuous disk. Filaments short or elongated. Anthers 2-celled, opening 

 lengthwise. Gynoecium of 2-5 united carpels. Ovary inferior, or partly in- 

 ferior, usually 2-5-celled or rarely 1-celled. Styles united. Stigmas various, 

 sometimes lobed. Ovules 2 or rarely 4 or more in each cavity, pendulous. Fruit 

 leathery, crowned with the calyx, indehiscent or tardily septicidal. 



1. RHIZOFHORA L. 



Evergreen trees, with an astringent bark, and stout pithy branchlets. Leaves oppo- 

 site : blades entire : stipules elongated, interpetiolar, caducous. Flowers cream-colored or 

 yellow, 2 or several on forking peduncles. Hypanthium short, adnate to the base of the 

 ovary. Sepals 4, leathery. Petals 4, emarginate, leathery. Stamens 4-12, alternate with 

 the petals : filaments short. Ovary 2-celled, half-inferior, produced into a fleshy cone. 

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