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. Rootstocks 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 IS utt. 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. 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. 



Stems decumbent : sepals 1-1.5 mm. long : petals 2-3 mm. long : pods 2-2.5 



cm. long. 3. C. curvisiliqua. 



Stems erect : sepals 3-3.5 mm. long : petals 6-9 mm. long : pods 3-3.5 cm. long. 4. C. Clematitis. 

 Basal leaves with pinnately divided blades. 

 Stems leafy. 



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 4mm. wide or broader. 



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. 



1. Cardamiue bulbosa (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 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. [Cardamine rhomboidea 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. 



curnbent, 



orbicular blades and 



cm. long, undulate or slightly lobed, attenuate at 'the base : raceme elongating, with a zigzag 

 rachis: pedicels ascending or spreading, 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 springs and slow streams, Florida. Spring to fall. 

 31 



