Vor. II.] MUSTARD FAMILY. 135 
1. Leavenworthia uniflora (Michx. ) Britton. Michaux’s Leavenworthia. 
(Fig. 1742.) 
Cardamine uniflora Michx. Fl. Bor. Am. 2: 29. 1803. 
Leavenworthia Michauxti Torr. Ann. Lye. N. Y. 4: 89. 
os iaba Britton, Mem. Torr. Club, 5: 171. 1894. 
Tufted, 3/-6’ high. Basal leaves rosulate, numerous, 
1/-4’ long, the segments 5-17, irregularly dentate or 
angled, 2’’-3’’ long, the terminal one somewhat larger, 
all narrowed near the base, but slightly expanded at 
the junction with the rachis; stem-leaves none, or 1-3, 
similar, but smaller; flowers about 3’’ broad; petals 
white or purplish with a yellow base, about twice the 
length of the sepals; pods oblong or linear, 6//—15/” 
long, 2’ wide when mature; seeds winged; style stout, 
about 1%’ long. 
In open, dry places, southern Indiana to Tennessee, 
west to Missouri. April. 
2. Leavenworthia torulosa A. Gray. 
Necklace Leavenworthia. (Fig. 1743.) 
Leavenworthia torulosa A. Gray, Bot. Gaz. 5:26. 1880. 
Closely resembles the preceding species, but the pods 
are narrower and distinctly constricted between the 
seeds. Style conspicuous, 114//-2’/ long; seeds 
sharp-margined, barely winged; terminal segment of 
the basal leaves decidedly broader and larger than the 
lateral ones. 
Barrens of Kentucky and Tennessee. April. 
23. PHYSARIA A. Gray, Gen. Ill. 1: 162. 1848. 
Low perennial stellate-canescent herbs, with erect or ascending usually quite simple 
stems, spatulate mostly entire leaves, the basal ones tufted, and medium-sized yellow flowers 
in terminal racemes. Petals longer than the sepals. Style filiform. Silicles membran- 
ous, stellate-pubescent, their cells inflated, subglobose, the septum narrow. Seeds not mar- 
gined; cotyledons accumbent. [Greek, bellows, from the resemblance of the inflated fruit. ] 
About 4 species, natives of western North America. 
1. Physaria didymocarpa (Hook.) A. 
Gray. Double Bladder-pod. (Fig. 1744.) 
Vesicaria didymocarpa Hook. Fl. Bor. Am. 1: 49. pi. 
Pirin ediiiacirb A. Gray, Gen. Ill. 1: 162. 1848. 
Densely stellate-canescent, pale green; root long 
anddeep. Stems decumbent or ascending, slender, 
simple, 3/-12’ long; leaves spatulate, the basal ones 
obtuse, entire, or few-lobed, narrowed into mar- 
gined petioles; terminal segment large, 1/-5’ long; 
stem-leaves nearly sessile, acute or subacute, much 
smaller; racemes 2/—5/ long in fruit; flowers 5//-6’’ 
broad; pods didymous, variable, often 6’ thick 
through the strongly inflated cavities, emarginate 
at base and summit, commonly broader than high; 
seeds numerous, 
In dry soil, Northwest Territory to British Columbia, 
Nebraska, Colorado and Nevada. May-Aug. 
