932 MENYANTHACEAE 



sometimes solitary. Calyx-lobes 4, keeled. Corolla white or yellowish : lobes 4, imbri- 

 cated. Stamens 4, included : filaments adnate to the sinuses of the corolla. Ovary 

 1-celled, with 4 intruded placentae : style very short or wanting : stigma 2-lobed. Ovules 

 numerous. Capsule longer than thick, 2-valved. Seeds minute. 



Corolla 6 mm. long or more ; lobes spatulate to obovate-spatulate. 1. B. vema. 

 Corolla 5 mm. long or less ; lobes lanceolate to oblong. 



Corolla-lobes oblong, more or less arose, abruptly pointed. 2. B. Virginica. 



Corolla-lobes lanceolate, entire, acute or acuminate. 3. B. lanccolata. 



1. Bartonia v6rna (Michx.) Muhl. Stems 0.5-3 dm. tall, simple or sparingly 

 branched above: leaves (scales) few, opposite, 1-2 mm. long: calyx lobes linear-lanceo- 

 late, about 3 mm. long, acute : corolla white, fully 1 cm. broad ; lobes spatulate to obovate- 

 spatulate, 7-10 mm. long : capsules oblong or ovoid-oblong, 5-6 cm. long. 



In wet pine lands, Virginia to Florida and Louisiana. Late winter and spring. 



2.. Bartonia Virginica (L. ) B. S. P. Stem 1-4 dm. tall, simple or commonly 

 branched, the pedicels or branches erect or appressed : leaves opposite or commonly alter- 

 nate in the case of depauperate plants, often approximate near the base of the stem : calyx- 

 lobes subulate or lanceolate-subulate, 2-3 mm. long : corolla 3-5 mm. broad, yellowish 

 white ; lobes oblong, erose near the apex, abruptly pointed : capsules 3-5 mm. long. 



In open woods or swamps, Newfoundland to Michigan, Florida and Louisiana, Summer. 



3. Bartonia lanceolata Small. Stem 2-6 dm. tall, simple, or typically paniculately 

 branched, the pedicels or branches lax or spreading : leaves opposite or alternate : calyx- 

 lobes subulate or lanceolate-subulate, 2-3 mm. long : corolla commonly about as large as 

 that of -B. Virginica; lobes lanceolate, entire, acute or acuminate : capsules 4-5 mm. long. 



In moist soil or wet pine lands. New York to Florida and Arkansas. Summer and fall. 



11. OBOLARIA L. 



Perennial caulescent herbs, with fleshy tissues and glabrous foliage. Leaves reduced 

 to scales, typically opposite. Flowers in short spikes, few, subtended by thick bracts. 

 Calyx-lobes 2, spatulate. Corolla white or purplish : lobes 4, about as long as the tube, 

 toothed. Stamens 4, included : filaments adnate to the sinuses of the corolla. Ovary 

 1-celled, with 4 placentae : style slender : stigmas 2. Ovules numerous. Capsule 2-valved 

 or opening irregularly. Seeds minute. Pennywort. 



1. Obolaria Virginica L. Foliage purplish green. Stems 0.5-2 dm. tall, simple or 

 branched : leaves various, the lower ones reduced to small scales, the upper cuneate or 

 cuneate-obovate, 5-10 mm. long, obtuse : calyx sessile or nearly so ; lobes 2, nearly oblong 

 or oblong-spatulate, shorter than the corolla : corolla white or pinkish, 7-10 mm. long ; 

 lobes slightly shorter than the tube, acute, toothed near the apex : capsules oblong or 

 oval-oblong, 5-6 mm. long. 



In woods and thickets, New Jersey to Illinois, Florida and Texas. Spring. 



12. VOYRIA Aubl. 



Annual or perennial caulescent herbs, growing in humus, often with colorless foliage. 

 Leaves reduced to scales, opposite, or alternate on the lower part of the simple or sparingly 

 branched stem. Flowers solitary or in cymes. Calyx pale : lobes 4 or 5. Corolla white, 

 yellow or golden or rarely pink or blue, salverform : lobes 4-5, spreading, contorted. 

 Stamens 4-5, included, partially adnate to the corolla-tube : anthers opening introrsely. 

 Ovary 1-celled, with entire or 2-parted placentae : style single : stigma dilated. Capsule 

 longer than thick, 2-valved. Seeds wrinkled or reticulated. 



1. Voyria Mexickna Griseb. Foliage colorless, glabrous. Stems 1-4 dm. tall, often 

 mainly subterranean, simple or sparingly branched above, rather slender: leaves (scales) 

 opposite, 3-5 mm. long, usually few: calyx slightly fleshy ; lobes lanceolate or oblong- 

 lanceolate, acute: corolla white or pink, 6-8 mm. long; lobes triangular, acute, 1-1.5 

 mm. long : capsules 5-6 mm. long. 



In sandy woods, Florida Keys. Also in the West Indies and Mexico. 



Family 3. MENYANTHACEAE G. Don. Buckbean Family. 

 Pereuuial aquatic or bog herbs, with horizontal rootstocks. Leaves alternate, 

 often all basal : blades simple or 8-foliolate. Flowers perfect, solitary or in 

 terminal clusters or racemes. Calyx of 5 partially united sepals. Corolla 



