BEASSICACEAE 481 



more or less flaring acute teeth : scapes erect, 2-3 dm. tall : bracts 3, with blades simi- 

 lar to those of the leaves: pedicels ascending, 1-1.5 cm. long, or longer at maturity: 

 sepals oblong, 56 mm. long, obtuse: petals about twice as long as the sepals: pods 

 not seen. 



In open woods, Tennessee. Spring. 



5. Dentaria diphylla Michx. Eootstocks continuous. 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 cm. long. 



In rich woods and damp soil, Nova Scotia to Minnesota, South Carolina and Kentucky. 

 Spring. 



6. Dentaria heterophylla Nutt. Eootstocks jointed. Foliage glabrous or spar- 

 ingly pubescent: leaves with long petioles and ovate or obovate coarsely crenate or 

 lobed segments, 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 segments: 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 alter- 

 nate: 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. Stamens 6 or rarely 4. Ovary sessile: style short or elongated: stigma capi- 

 tate 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 

 CHESS. 



Leaf-blades entire or undulate. 



Stems erect from a tuberous base. 1. C. bulbosa. 



Stems decumbent from a creeping base. 2. C. rotundifolia. 



Leaf-blades, at least those of cauline leaves, pinnately divided. 

 Basal leaves with entire or repand blades. 

 Petals decidedly clawed: filaments slender. 



Leaf -lobes with mucronate teeth : ovary scarcely beaked. 3. C. curvisiliqua. 



Leaf-lobes with rounded teeth: ovary slender-beaked. 4. C. flag ellif era. 



Petals broad-based: filaments dilated. 5. C. Clematitis. 



Basal leaves with pinnately divided blades. 

 Stems leafy. 



Pods spreading or ascending, over 1 mm. broad. 6. C. flexuosa. 



Pods erect, less than 1 mm. broad. 



Corolla 3 mm. wide or narrower. 7. C. parviflora. 



Corolla 4 mm. wide or broader. 



Sepals about 1 mm. long. 8. C. arenicola. 



Sepals about 2 mm. long. 9. C. Pennsylvania 



Stems scape-like: leaves basal or mainly so. 10. C. hirsuta. 



1. Cardamine bulbosa (Schreb.) B.S.P. Perennial by tuberous rootstocks, 

 glabrous. 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 cm. 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 cm. long. [Car- 

 damine rlwmboidea DC.] 



In swampy meadows and low grounds, Nova Scotia to Minnesota, Florida and Texas. 

 Spring. 



2. Cardamine rotundifolia 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 cm. long, entire, undulate or angled, rarely 

 accompanied by 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 cm. long, beaked. 



In springy places, New Jersey to Ohio, North Carolina and Kentucky. Spring and 

 summer. 



31 



