482 BEASSICACEAE 



3. Cardamine curvisillqua Shuttl. Plants 3-8 dm. long, with creeping root- 

 stocks: cauline leaves 3-6 cm. long; blades pinnately parted, with 3-7 oval or obo- 

 vate segments or some of them with merely a terminal lobe: sepals becoming 2.5-3 

 mm. long: petals 2-4.5 mm. long, spatulate, the claws slender: filaments not dilated: 

 pods 2.5-3 cm. long. 



In springs and slow streams, Florida. Spring to fall. 



4. Cardamine flagellifera O. E. Schulz. Plants spreading, 1-3 dm. long, with 

 horizontal rootstocks: cauline leaves 7-16 cm. long; blades pinnately parted, with 3-5 

 ovate, orbicular or reniform shallowly lobed divisions: sepals becoming 4-4.5 mm. 

 long: petals 9-10 mm. long, or sometimes smaller, spatulate: filaments flattened: pods 

 not seen. 



On shaded mountain slopes, North Carolina, South Carolina and Georgia. Spring. 



5. Cardamine Clematitis Shuttl. Plants erect, 1-3 dm. tall, with slender hori- 

 zontal rootstocks: cauline leaves 3-8 cm. long: blades or the 3 divisions of the blades, 

 irregularly lobed: sepals becoming 3-3.5 mm. long: petals 6-7 mm. long, pandurate, 

 the claws very broad: filaments dilated: pods 3-4 cm. long. 



In springy places at high altitudes, Virginia to North Carolina and Alabama. Spring 

 and summer. 



6. Cardamine flexuosa With. Plants with ascending or spreading stems 1-4 



dm. long: cauline leaves 1-7 cm. long: blades pinnately divided or pinnatifid, the 



several lateral segments wide, broadened upward: sepals becoming 1.5-2 mm. long: 



petals nearly twice as long as the sepals: pods 1.5-2.5 cm. long. 



In mountain swamps and woods, Maine to Michigan and North Carolina. Also in 

 Europe and Asia. Spring and summer. 



7. Cardamine parviflora L. Plants with slender stems 0.5-3 dm. tall: cauline 



leaves 1.5-6 cm. long; blades pinnately divided, the several lateral segments narrow, 



but broadened upward: sepals becoming 1-1.5 mm, long: petals slightly longer than 



the sepals: pods 1.5-2.5 cm. long. 



In dry soil and on rocky banks, Quebec to Oregon, southward on the mountains to 

 Georgia. Also in Europe and Asia. Spring. 



8. Cardamine arenicola Britton. Plants 1-3 dm. tall: cauline leaves 1-4 cm. 

 long: blades pinnately divided, the lateral segments linear or linear-oblong, mainly 

 entire: sepals becoming about 1 mm. long: petals about twice as long as the sepals^ 

 mostly cuneate: pods linear, about 2 cm. long. 



In moist, usually sandy soil, Connecticut to Kentucky, Florida and Tennessee. Spring. 



9. Cardamine Pennsylvdnica Muhl. Plants 2-10 dm. tall, glabrous or nearly 

 so: cauline leaves 4-8 cm. long; blades pinnately divided, the lateral segments very 

 broad or narrow, undulate, toothed or lobed: sepals becoming about 2 mm. long: 

 petals somewhat longer than the sepals, mostly spatulate: pods linear-filiform, 2-2.5 

 mm. long. 



In swamps and low grounds, Newfoundland to Minnesota, Florida and Missouri. 

 Spring. 



10. Cardamine hirsuta L. Plants 0.5-2.5 dm. tall, pubescent: cauline leaves 



much smaller than the basal, mostly 1-2.5 cm. long; blades pinnately divided, the 



lateral segments mostly linear to cuneate: sepals becoming 1.5-2 mm. long: petals 



about twice as long as the sepals: pods narrowly linear, 2-2.5 cm. long. 



In dry or moist soil, Massachusetts to Michigan, North Carolina and Georgia. Also 

 in Europe and Asia. Spring. 



22. LEAVENWORTHIA Torr. 

 Low annual or biennial herbs, with scape-like, often tufted, stems and glabrous 

 foliage, or the pubescence, if present, of simple hairs. Leaves mainly basal: blades 

 lyrate-pinnatifid. Flowers perfect, solitary or a few in racemes. Sepals 4, narrow, 

 equal at the base. Corolla white, yellow or purplish: petals 4, broadened upward. 

 Stamens 6: filaments unappendaged. Ovary short-stalked: style slender: stigma 

 2-lobed. Ovules numerous or few. Pods elongated, somewhat inflated, often con- 

 tracted between the seeds, the valves nerveless. Seeds flattened, in 1 row in each 

 cavity, winged. Embryo straight or nearly so. Cotyledons nearly or quite as broad 

 as long. The plants flower in the spring. 



Cotyledons orbicular, cordate: radicle straight. 1. L. aurea. 

 Cotyledons oval : radicle oblique. 



Capsules not constricted between the seeds. 



Petals with white or purplish blades: styles less than 3 mm. long. 2. L. uniflora. 



Petals with yellow blades: style over 3 mm. long. 3. L. stylosa. 



Capsules constricted between the seeds. 4. L. torulosa. 



