[Vor. 5 
144 " ANNALS OF THE MISSOURI BOTANICAL GARDEN 
2. Pods acute, obtuse = truncate at the base 
ordat 
ба”; leaves fiddle- -shaped; plants of 
кө. i EEE ET 2. P. vitulifera 
ке Basal к^ mostly entire; coarse 
nem of western Nebraska and the 
errr er errr IT ET CIT . P. brassicoides 
II. Basal leaves acute; blade lanceolate in out- 
lin 
1. Basal leaves далу КЕШЕ. рыз азық . P. acutifolia 
2. Basal leaves more or less pinnatifid...... Н P. floribunda 
B. — sterile soboles po veloping from the 
ette; pods pe Bes Eb i43 + UENIT LES 6. P. Osterhoutii 
b. Shoulders of the upper sinus angular, in young pods 
at least; pods furnished with keels along which the 
alls fold on dr ТҮШЕ AAEE 555955555» 7. P. Newberryi 
B. aden, нес? strongly flattened laterally. 
a. Pods obcordate in outline; replum about m. long..8. P. Geyeri 
b. obreniform or broadly elliptical in outline; 
replum much longer 
a. St т А.Д 2 mm, long; base of pods obtuse or trun- 
RU OM CERE NET 9. P. oregona 
B. Style prine 5 mm. long; base of pods cordate....10. P. alpestris 
1. P. didymocarpa (Hook.) Gray in Wats. Bot. King's 
Exp. 20. 1871. 
This species in its typical form is predominantly northern, 
occurring in the mountains from southern Canada to Wyo- 
ming and northern Utah. 
la. Var. australis, n. var.! 
Basal leaves entire or undulately toothed; pubescence of 
leaves and young pods closely appressed. 
Distribution: this variety replaces the typical form in 
southern Wyoming, Colorado, northern New Mexico, and in 
parts of Utah. 
Specimens examined: 
Wyoming: Sand Creek, Albany Co., June 1, 1900, A. Nel- 
son 7026 (Mo. Bot. Gard. Herb. and Rky. Mt. Herb.); dry 
white hills, Dyer’s Ranch, Carbon Co., June 21, 1901, Good- 
ding 80 (Mo. Bot. Gard. Herb. and Rky. Mt. Herb.); Coke- 
ville, June 11, 1898, 4. Nelson 4637 (Rky. Mt. Herb.) ; Ft. 
Bridger, June 9, 1898, A. Nelson 4602 (Rky. Mt. Herb.); 
Granger, June 13, 1898, А. Nelson 4688 (Rky. Mt. Herb.) ; 
Green River, May 30, 1897, A. Nelson 3032 (Rky. Mt. Herb.) ; 
hysaria didymocarpa ( Hook. ) Gray, var. patrini: var. nov., foliis rad- 
icalibus integris vel sinuato-dentatis; siliquis junioribus adpresse Paberi, 
—Collected on gravel washes, Placerville, Colorado, July 23, 1917, Payson 1 
(Mo. Bot. Gard. Herb.), TYPE. 
