468 BRASSICACEAE 
ing, 3-4 mm. long : sepals oblong, about 1 mm. long, obtuse : petals white, spatulate, slightly 
longer than the sepals: silicles suborbicular or oval-orbicular, 3-4 mm. broad, margined 
above, notched at the apex. 
In all situations, Quebec to Minnesota, Kansas, Florida, Texas and Mexico. Naturalized in 
Europe. Spring and fall. 
2. Lepidium médium Greene. Annual, glabrous or nearly so. Stems 1-5 dm. tall, 
simple, or more or less branched: basal leaves 2-8 cm. long: blades coarsely toothed or 
rarely 1-2-pinnatifid: stem-leaves narrow, more or less distinctly toothed or those of the 
branches entire: pedicels ascending, finally 2-3 mm. long: petals conspicuous, bright 
white: pods suborbicular, about 3 mm. broad, notched at the apex. 
In dry soil, Idaho to Vancouver Island, Texas and California. Spring and summer. 
3. Lepidium apétalum Willd. Annual or perhaps more persistent, glabrous or puber- 
ulent, odorless. Stems 2-7 dm. tall, more or less branched: basal leaves and sometimes 
the lower stem-leaves with pinnatifid blades: upper stem-leaves narrow, incised to entire, 
erect or ascending: pedicels erect or nearly so during anthesis, thereafter becoming 2-3 
. mm. long, curving out making the fruiting raceme much thicker than the top: petals 
minute and inconspicuous or obsolete: pods suborbicular, about 2 mm. broad, notched at 
the apex. 
In dry soil and waste places, Maine to the Northwest Territory, California, New York and Texas. 
Spring to fall. 
4. Lepidium austrinum Small. Annual or biennial, finely hirsute all over, at least 
during anthesis. Stems 1-3 dm. tall, branched above and sometimes also at the base: 
basal leaves spatulate, early deciduous: stem-leaves with spatulate or oblanceolate blades 
1.5-5 em. long : pedicels ascending during anthesis, spreading at maturity, becoming 2-3 
mm. long: petals minute or wanting: pods suborbicular, 2 mm. broad or slightly more, 
finely hirsute. $ 
In plains and prairies, Texas. Spring. 
5. Lepidium oblóngum Small. Annual or biennial, minutely pubescent. Stems 
usually much branched at the base, the branches radially spreading, more or less decum- 
bent, 0.5-2 dm. long, usually branched: leaves rather numerous ; blades pinnatifid, 1-2 
cm. long, the segments mostly 5-7, quite narrow, acute : pedicels puberulent : petals want- 
ing or obsolete : pods oblong or oval, about 3 mm. long, slightly winged at the apex. 
In dry ground, near Sapulpa, Indian Territory. Spring and summer. 
4. SYNTHLÍPSIS A. Gray. 
Annual caulescent herbs, with grayish pubescent foliage. Leaves alternate: blades 
sinuate or pinnatifid, sometimes petioled. Flowers perfect, in loose racemes. Sepals 
oblong, spreading during anthesis. Petals surpassing the sepals, with flat blades and short 
claws. Stamens 6: filaments unappendaged. Ovary 2-celled : style slender : stigma entire. 
Ovules several. Pods relatively short, strongly compressed, on ascending or reflexed 
pedicels, the valves merely keeled. Seeds neither winged nor margined, about 10 in each 
cavity. Cotyledons accumbent. 
1. Synthlipsis Berlandiéri A. Gray. Foliage finely stellate-tomentose. Stems 
branched at the base, the branches spreading, simple or branched : basal leaves 3-8 cm. 
long, with short petioles and pinnatifid blades ; stem-leaves sessile, oblong, oblanceolate or 
oval, dentate or sinuate-pinnatifid, 1-2.5 cm. long, acute: pedicels finally recurved, 1-1. 
em. long: sepals oblong-lanceolate, 3 mm. long: petals yellow to purple, about twice as 
od as : sepals : pods suborbicular, about 6 or 7 mm. broad, reticulated, glabrous, usually 
eflexed. 
On plains and prairies, southern Texas. Spring.—The variety with hirsute stems is S. Berlandieri 
hispida S. Wats. Spring. 
5. LESQUERELLA S. Wats. 
Annual or perennial scapose or caulescent herbs, with stellate pubescence. ` Leaves 
alternate, sometimes mainly basal: blades entire or undulate. Flowers perfect, in racemes 
or panicles. Sepals 4, equal, or 2 saccate at the base. Corolla usually yellow or y ellow- 
ish, the 4 petals surpassingthe sepals, entire. Stamens 6. Ovary sessile or stalked : style 
slender: stigma capitate or 2-lohed. Ovules few. Silicles oblong or globose, inflated, the 
valves nerveless : septum nerved from the apex to the middle. Seeds flattened, sometimes 
narrow-margined. Cotyledons accumbent. |. BLADDER-POD. 
