186 Cruciferaceae 
DENTARIA TOOTH-WORT 
Perennial; rhizome fleshy, horizontal, scaly or toothed; stems erect, mostly un- 
branched, leafless below. Leaves palmately laciniate or 3-divided, petioled. Flowers 
white or rose or purple, in corymbs or short racemes. Petals much longer than the sepals. 
Style slender. Pod linear, straight, flat, without stipe, dehiscent; valves veinless or faintly 
mid-veined. Seeds | row in each cell, oval, flat, thick, wingless. (LL. dens=tooth; re- 
ferring to the tooth-like projections of the rootstock.) 
A.  Stem-leaves of 3 petiolulate leaflets; basal leaves entire or with 3 leaflets. U. 
B. californica Nutt. 
AA.  Stem-leaves either not completely divided into leaflets or these not petiolulate. 
B. Basal leaves round-cordate, crenate or sinuate; racemes few-flowered. W. C. 
D. tenella Pursh (Delicate Tooth-wort ) 
BB. Basal leaves parted or divided into 3—5 segments; racemes densely many 
flowered. 
C. Petals 1O—12 mm. long. U. C. E. (D. quercetorum; D. gemmata.) 
D. macrocarpa Nutt. 
CC. Petals 12—17 mm. long. U. E. (D. pulcherrima; D. sinuata.) 
D. macrocarpa pulcherrima Rob. 
PLATYSPERMUM 
Annual, small, green into winter. Leaves simple or pinnatifid. Flowers solitary, on 
simple scapes, white, small. Petals obovate, entire or retuse. Stigma sessile, entire. Pod 
sessile, orbicular, strongly flattened; partition flat, veinless, hyaline. Seeds 4—6 in each 
cell, in 2 rows, reticulate, orbicular, broadly winged. (Gk. platys—wide, sperma=seed. ) 
E. P. scapigerum Hook. : 
PHYSARIA TWIN-POD 
Perennial, low stellate-hairy; stem erect or ascending, usually quite simple. Leaves 
spaiulate, mostly entire; basal-leaves tufted. Flowers yellow, in terminal racemes. Petals 
longer than the sepals. Style filiform. Pod membranous, stellate-pubescent; partition 
narrow; cells inflated, subglobose, several-seeded. Seed not margined. (Gk. physa—a 
bladder; the pod is inflated.) 
A. Mature pod much inflated, 1.2—1.7 cm. wide, its upper sinus acute. E. 
P. didymocarpa Gray 
AA. Mature pod but little inflated, its upper sinus shallow and rounded. 
B. Pedicels 6 mm. long; pod 5—8 mm. wide, its partition ovate. E. 
P. geyeri Gray 
BB.  Pedicels 2 mm. or more long; pod 10—20 mm. wide, its partition narrowly 
linear. E, P. oregana Wats. 
LESQUERELLA BLADDER-POD 
Annual or perennial, low, mostly with stellate hairs. Leaves entire or repand-den- 
tate. Flowers mostly yellow. Petals spatulate to oblong-obovate, entire. Stigma flat, 
capitate, entire or lobed. Pod more or less turgid, rounded or ovate or short-oblong, ses- 
sile or stipitate; valves veinless; partition hyaline, veined from apex to middle. Seeds 
several to many, rounded, flat, wingless or narrowly wing-margined. (Diminutive, honor 
of L. Lesquereux, an American bryologist. ) 
A. Hairs stellate; pod obovate, its cells 2-ovuled. E. 
L douglasii Wats. 


