52 CRUCIFERA. PHYSARIA. 
PSILONEMA. 
L. Douglasii Watson 1. c. 118. Canescent throughout with fine ap- 
pressed pubescence: stems usually simple, from a simple eaudex: leaves 
ovate to oblanceolate or linear mostly entire: petals spatulate, 3-4 lines 
long: pods obovate, very obtuse, erect on spreading pedicels; cells 2- 
ovuled. On the mountains of eastern Oregon and Washington. 
** * Pods didymous with narrow nerveless partition. 
12 PHYSARIA Gray Gen. Dl. i, 162. 
Low stellately canescent perennial herbs with mostly entire 
leaves and yellow flowers. Petals .patulate to oblong, entire. 
Filaments filiform. Anthers sagittate. Pods didymous: with 
a short narrow partition: cells infiated, nearly globular, mem- 
branaceous, nerveless, several-seeded. Seeds not winged. Coty- 
ledons accum bent. 
* Cells of the pods much inflated and longer than the partition. 
P. didymocarpa Gray 1. c. Very can scent, and lepidote with dense 
white stellate pubescence: radical leaves petiolate, with roundish toothed 
angled or entire blade, or oblanceolate anu more or less sinuately-toothed 
below: cauline leaves mostly entire, spainlate; racemes dense: pedicels 
becoming 6-7 lines long spreading or ascending: sepals lanceolate, shorter 
than the rather pale yellow petals: pods strongly didymous, -rather deeply 
notched above entire or more or less cordate at base, becoming 6-8 lines 
broad; valves subglobose, with no demarcation between the dorsal and 
ae surfaces; walls papery. Eastern Oregon to Brit. Columbia and 
evada. 
_ * * Cells more or less compressed and but little exceeding the 
partition. 
P. Geyeri Gray 1l.c. Whitish with dense stellate tomentum: radical 
leaves with short, broadly ovate, entire, obtusely pointed blade narrowed 
below to long channeled petioles; cauline leaves small, spatulate: racemes 
rather dense, 1-2 inches long: pedicels spreading or curved, ascending, 3 
lines long: pods small for the genus, broadly and shallowly obcordate, 
narrowed towards the base; cells 244-3 lines long at dehiscence ; partition 
ovate much exceeded by the persistent style. Sandy soil and volcanic 
ashes, upper Spokane valley, Washington. 
P. Oregona Watson Pr c. Am. Acad. xvii, 363. Canescent: stems 
several from the large woody root, 4-6 inches high: leaves oblanceolate- 
spatulate, the lower few-toothed below; the upper entire: pods obcom- 
pressed 5-10 lines broad, round-reniform ; the narrowly linear partition 3- 
4lines long; the flattened obtusely. rounded cells 3-4 seeded: style very 
short. Gulches, Union county, Oregon. Cusick. ; | 
* * * * Pods orbiculur or nearly so. Filaments often dilated or 
appendaged near the base. 
14 PSILONEMA C. A. Meyer in Ledeb. Fl. Alt. iii, 50. 
Low stellate-pubescent herbs with mostly simple leaves and 
rather small flowers in slender racemes. Sepals equal. Petals 
white or yellow, cuneate. Filaments unappendaged. Pods 
oval or orbicular, compressed with convex neryeless valves, 2- 
celled, with 2 seeds in each cell. Cotyledons aceumbent. 
P.  calycinum C. A. Meyer Bull. Acad. St. Pet. vii, 132. _ Stellate pub- 
escent: stems branching from near the base, the branches mostly simple, 
decumbent at base 6-12 inches long: leaves entire, linear-spatulate 6-12 
