BRASSICACEAE 481 
more or less flaring acute teeth : scapes erect, 2-3 dm. tall: bracts 3, with blades similar 
to those of the leaves: pedicels ascending, 1-1.5 cm. long, or longer at maturity: sepals 
oblong, 5-6 mm. long, obtuse: petals about twice as long as the sepals: pods not seen. 
In open woods, Tennessee. Spring. : 
5. Dentaria diphylla Michx. Rootstockscontinuous. Foliage glabrous: leaves with 
long petioles and 3 ovate or lanceolate crenate-serrate segments: scapes erect, 1-3 dm. 
tall: bracts 2, with blades similar to those of the leaves: pedicels 2-3 cm. long, ascending : 
sepals oblong, 5-6 mm. long, obtuse: petals white, twice as long as the sepals : pods slender, 
2-3 em. long. 
In rich woods and damp soil, Nova Scotia to Minnesota, South Carolina and Kentucky. Spring. 
6. Dentaria heterophylla Nutt. Rootstocks jointed. Foliage glabrous or sparingly 
pubescent: leaves with long petioles and ovate or obovate coarsely crenate or lobed seg- 
ments, the teeth or lobes mucronulate : scapes 2-3 dm. tall : bracts usually 2, with blades 
very unlike those of the leaves, divided into linear or linear-lanceolate entire or serrate seg- 
ments: pedicels ascending, 2-2.5 cm. long: sepals oblong, about 5|mm. long, obtuse: 
petals light purple, twice as long as the sepals : pods slender, about 2.5 cm. long, narrowed 
at each end, beaked. 
In woods, New Jersey and Pennsylvania to Georgia and Tennessee. Spring. 
21. CARDAMINE L. 
Annual or perennial herbs, with erect or weak and creeping stems. Leaves alternate : 
blades entire or pinnately dissected. Flowers perfect, in racemes or panicles. Sepals 4, 
equal or nearly so. Corolla white or pink, or purple : petals 4, narrowed into claws. Sta- 
mens 6 or rarely 4. Ovary sessile : style short or elongated : stigma capitate or 2-lobed. 
Ovules numerous. Pod elongated, narrow, flattened, often erect, the valves nerveless or 
nearly so, elastically opening at maturity. Seeds in 1 row, not margined. Cotyledons 
accumbent, one sometimes overlapping the radicle. BITTER Cress. 
Leaf-blades entire or undulate. 
Stems erect from a tuberous base. 
Btems decumbent from a creeping base. 
Leaf-blades, at least those of cauline leaves, pinnately divided. 
Basal leaves with entire or repand blades. 
Stems decumbent: sepals 1-1.5 mm. long: petals 2-3 mm. long: pods 2-2.5 m 
em. long. 3. C. curvisiliqua. 
Stems erect : sepals 3-3.5 mm. long: petals 6-9 mm. long: pods 3-3.5cm. long. 4. C. Clematitis. 
Basal leaves with pinnately divided blades. 
Stems leafy, 
. C. bulbosa. 
. C. rotundifolia. 
Nor 
Pods spreading or ascending, over 1 mm. broad. 5. C. flexuosa, 
Pods erect, less than 1 mm. broad. : 
Corolla 3 mm. wide or narrower. 6. C. parviflora. 
Corolla 4 mm. wide or broader. A 
Sepals about 1 mm. long. 7. C. arenicola. _ 
Sepals about 2 mm. long. 8. C. Pennsylvanica. 
Stems scape-like : leaves basal or mainly so. 9. C. hirsuta. 
l. Cardamine bulbósa (Schreb.) B.S.P. Perennial. by tuberous rootstocks, gla- 
brous. Stems erect, 1-5 dm. tall, simple or branching above, destitute of runners: leaves 
few ; basal and lower stem-leaves with suborbicular, often cordate, entire or angled blades 
and long petioles ; upper leaves sessile or nearly so, with more or less elongated entire 
angled or coarsely toothed blades : pedicels ascending, 1-2 em. long: sepals oblong, 2.5- 
3.5 mm. long, obtuse : petals white or pink, about thrice as long as the sepals or sometimes 
four times longer : pods slender, linear, 2.5 em. long. [Cardamine rhomboidea DC. ] 
In swampy meadows and low grounds, Nova Scotia to Minnesota, Florida and Texas. Spring. 
2. Cardamine rotundifdlia Michx. Annual or perennial, glabrous. Stems weak, 
ascending, or prostrate and creeping, 1-4 dm. long, producing runners : leaves few ; blades 
ovate, oval or suborbicular, 1-4 em. long, entire, undulate or angled, rarely accompanied 
y two small lateral segments, petioled : pedicels ascending, 1-2.5 cm. long, slender: sepals 
oblong, 2 mm. long, obtuse: petals white, about 4 times as long as the sepals: pods slender, 
linear, 2-3 em. long, beaked. 
In springy places, New Jersey to Ohio, North Carolina and Kentucky. Spring and summer. 
3. Cardamine curvisiliqua Shuttl. Perennial, aquatic, glabrous. Stems weak, de- 
cumbent, 3-8 dm. long, creeping, branching: leaves various, the lower onessimple, with sub- 
orbicular blades and long petioles, the upper ones pinnate; segments 3-7, oval or obovate, 1-3 
em. long, undulate or slightly lobed, attenuate at the base : raceme elongating, with a zigzag 
rachis: pedicels ascending orspreading, 5-10 mm. long: sepals oblong, 1-1.5 mm. long, obtuse: 
petals white, 2-3 mm. long: pods slender, 2-2.3 cm. long, nearly terete, curving upward. 
In om and slow streams, Florida. Spring to fall. 
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