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. verna. 
Corolla 5 mm. long or less ; lobes lanceolate to oblong. 
Corolla-lobes oblong, more or less erose, abruptly pointed. 2. B. Virginica. 
Corolla-lobes lanceolate, entire, acute or acuminate. 3. B. lanceolata. 
1. Bartonia vérna (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 em. 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 Virgínica (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: eorolla 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 lanceolàta 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 Mexicana 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 enu 
lanceolate, acute: corolla white or pink, 6-8 mm. long; lobes triangular, acute, 1-1. 
mm. long: capsules 5-6 mm. long. 
Insandy woods, Florida Keys. Also in the West Indies and Mexico. 
FAMILY 3. MENYANTHACEAE G. Don. BUCKBEAN FAMILY. 
Perennial aquatic or bog herbs, with horizontalrootstocks. Leaves altera 
often all basal: blades simple or 3-foliolate. Flowers perfect, solitary OT lla 
terminal clusters or racemes. Calyx of 5 partially united sepals. Coro 
