§. Athysanus Greene. 
Small inconspicuous annual herbs, branching at the base, the stems a 
slender, numerous. Leaves simple, the basal Spatulate, the cauline not 
auricled. Flowers minute, the pedicels soon recurving, petals white, often 
wanting. Pods orbicular, flattened, indehiscent, not winged. OQvules S—4, 
only one maturing. 
1. Ae pusillus (Hook.) Greene. Tufted annua 15-20 om. tall, the 
stems filiform, ascending, 
glabrous at least in the upper parts, the lower stellate-pubescent; basal 
leaves spatulate, 1 cm. long or less, usually with one or two teeth; cauline 
leaves oval, sessile, or ovate, sparingly toothed or entire, not auricled, 
5-8 mme long, stellate-pubescent, flowers about 1 mm. long on a subequal 
pedicel which soon recurves, elongating to 3-8 mn., glabrous; petele—often—» 
: pod 2-225 mm. in diameter, : ; 
hispidulous with more or less hooked hairs; seed l. 
S. end of Lake Pend Oreille, Leiberg; Kendrick, Henderson; Santa, 
Epling, Wyckoff and Offord; Coeur d'Alene valley, Geyer 607. 
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4. Physaria Gray. 
Caespitose perennials from rather stout tap roots, with dense 
pubescence. Basal leaves obovate to Spatulate, petioled, tufted; cauline 
leaves not auricled. Flowers yellow, conspicuouse Pods obcordate, and 
flattened, lightly inflated. Seeds 2-3 in each compartment. 
1. Pe Geyeri (Hook.) Gray. Double Bladder-pod. Stellate-canescent, 
silvery-silkyy perennial 15-20 om. tall; stems numerous, from a short crown, 
densely tufted, rather diffuse and Spreading above; basal leaves strongly 
spatulate, the blades orbicular to obovate, 1.5=2 om. broad, narrowed to a 
petiole nearly twice as long, margins entire; cauline leaves 1-2 om. long, 
oblanceolate, narrowed to an indefinite petiole; sepals narrowly oblong, 
S mm» long, petals 8-10 mm. long, yellow; pods 6 mn. long, slightly wider, 
broadly obcordate, +4 hae stellate-tubescent, the persistent 
style 5-6 mm. long; seeds commonly 2 in each canpartment. 
In dry gravelly soil at low elevations. 
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