834 EPILOBIACEAE 



Stigma 2-lobed. Ovules 2 in each cavity. Fruit pendulous, 1-celled, leathery. Seed 

 solitary, germinating in the persistent fruit, the elongating radicle sometimes reaching 

 the ground before the fruit falls. Endosperm wanting. MANGROVE. 



1. Rhizophora Mangle L. A shrub or tree, reaching a height of 10 in., forming 

 impenetrable thickets by the precocious and greatly elongating radicles of the embryo and 

 the numerous roots. Leaves 5-15 cm. long ; blades leathery, elliptic or elliptic-obovate, 

 obtuse, with a stout midrib ; petioles 0.5-1.5 cm. in length : peduncles 1-4 cm. long, 2-3- 

 flowered : pedicels stout, 5-10 mm. long : bractlets scale-like : hypanthium fleshy, tur- 

 binate or campanulate, 3-5 mm. long : sepals lanceolate, about 1 cm. long, involute, 

 keeled within, very firm, recurved at maturity: petals pale yellow, leathery, linear or 

 nearly so, cleft at the tip, involute above the middle, cobwebby along the edges : anthers 

 clustered around the style : fruit 2-3 cm. long, curved, the radicle protruding as a narrowly 

 clavate pendent body. 



Along the coast of peninsular Florida and the Keys. Also in tropical America. 



FAMILY 7. EPILOBIACEAE DC. EVENING-PRIMROSE FAMILY. 



Herbs, or rarely shrubs. Leaves alternate or opposite, without stipules, or 

 with mere glands in their place : blades simple. Flowers usually perfect. Hy- 

 panthium often elongated. Calyx of 2-6, usually 4, sepals. Corolla of 2-9, 

 usually 4, petals, convolute in the bud, or rarely wanting. Androecium of as 

 many stamens as the sepals or twice as many. Gynoeciurn of several, usually 

 4, united carpels. Ovary 1-6-celled, usually 4-celled, inferior. Styles united. 

 Stigmas distinct, or united, and capitate or discoid. Ovules generally anat- 

 ropous. Fruit capsular or rarely nut-like. Seeds sometimes appendaged, the 

 appendage either tubercle-like or a tuft of hairs. Endosperm scant or wanting. 

 [Onagraceae Dumort.] 



Floral whorls of 4 parts or more. 



Fruit a many-seeded capsule, opening by valves or by a pore, or by the breaking down of the walls. 

 Hypanthium not prolonged beyond the ovary. 

 Seeds naked, i. e., without a tuft of hairs. 

 Stamens 4, in 1 row. 



Leaves opposite : stems prostrate, creeping or floating : flowers sessile or on peduncles 

 longer than the leaves. 

 Flowers sessile: petals wanting or very small : leaf-blades petioled : capsules sessile, 



short, flat at the apex. 1. ISNARDIA. 



Flowers long-ped uncled : petals conspicuous : leaf-blades sessile : 

 capsule long-peduncled, elongated, curved, with a promi- 

 nent 4-lobed stylopodium at the apex. 2. LUDWIGIANTHA. 

 Leaves alternate : stems erector ascending: flowers sessile, the hy- 

 panthium and ovary sometimes narrowed into a pedicel-like 

 base. 3. LUBWIGIA. 

 Stamens 8-12 in 2 rows. 4. JUSSIAEA. 

 Seeds furnished with a tuft of silky hairs. 5. OHAMAENERION. 

 Hypanthium prolonged beyond the ovary. 



Seeds with a tuft of silky hairs. 6. EPILOBIUM. 



Seeds naked or merely tuberculate. 

 Stigmas 4, linear. 



Flowers with all the stamens equal in length. 



Ovules and seeds horizontal, borne in 2 or rarely more rows, pris- 

 matic-angled. 7. ONAGRA. 

 Ovules and seeds ascending, not angled. 



Buds erect : corolla yellow : ovules and seeds in 2 rows. 8. OENOTHERA. 



Buds drooping : corolla white turning pink : ovules and seeds 



in 1 row. 9. ANOGRA. 



Flowers with the alternate stamens longer. 



Ovules and seeds numerous, not tuberculate, clustered on slender 



funiculi. 



Corolla yellow : capsules depressed at the apex. 10. KNEIFFIA. 



Corolla red, purple or white : capsules pointed. 11. HARTMANNIA. 



Ovules and seeds few, sessile in 1 or 2 rows. 



Plants normally acaulescent. 12. LAVAUXIA. 



Plants caulescent. 



Capsules sharply 4-angled : stems wiry, diffuse : leaves 0.5- 



2.5 cm. long. 13. GAURELLA. 



Capsules broadly- winged : stems not diffused, stout : leaves 



4-15 cm. long. 14. MEGAPTERIUM. 



Stigma disk-like, entire or rarely 4-toothed. 



Free portion of the hypanthium longer than the ovary : stigma 



entire : stamens equal in length. 15. GALPINSIA. 



Free portion of the hypanthium shorter than the ovary : stigma 



slightly 4-toothed : stamens unequal in length. 16. MERIOLIX. 



Fruit indehiscent, nut-like. 



Filaments each with a scale at the base : ovary 4-celled. 17. GAURA. 



Filaments naked : ovary 1-celled. 18. STENOSIPHON. 



Floral whorls of 2 parts. 19. CIRCAEA. 



