CRUCIFERAE (MUSTARD FAMILY) 217 



Leaves pinnate. 



Leaves and plant small, 1-2 dm. high 3. C. unijuga. 



Leaves and plant larger, 2-4 dm. high. 



Leaflets ovate to rotund . . . . . . . . 4. C. Breweri. 



Leaflets linear to elliptic . ... . . . . . 5. C. pennsylvanica. 



1. Cardamine cordifolia Gray, PL Fendl. 8. 1848. Glabrous throughout, 

 3-8 dm. high, leafy to the top: leaves cordate, sparingly repand-dentate or 

 angular-toothed, 5-8 cm. long; the lowest often orbicular and the uppermost 

 triangular-cordate: flowers white, rather large: siliques 3-4 cm. long erect on 

 ascending pedicels. Along streamlets in the mountains; New Mexico to 

 Idaho. 



2. Cardamine infausta Greene, Pitt. 4: 307. 1901. Quite similar to the 

 preceding but the stem, petioles, and pedicels, and to a less degree the leaves, 

 more or less whitened with a shaggy hirsute pubescence: flowers smaller; the 

 petals spatulate. (C. cardiophylla Rydb. Bull. Torr. Bot. Club 28: 280. 1901.) 

 Utah and southwestern Colorado to Arizona. 



3. Cardamine unijuga Rydb. Bull. Torr. Bot. Club 24: 246. 1897. Gla- 

 brous: stems from very slender rootstocks, simple or branching, 1-2 dm. high: 

 basal leaves simple, cordate, or reniform; lower stem leaves with 1 or 2 pairs 

 of small oblong leaflets; the upper similar or reduced and entire: raceme slen- 

 der: sepals obtuse, half as long as the white 2 mm. long petals: siliques linear, 

 15-20 mm. long, erect, on erect pedicels and with short style. Wyoming and 

 Montana. 



4. Cardamine Breweri Wats. Proc. Am. Acad. 10: 339. 1875. Glabrous, 

 2-4 dm. high: stems simple or branched from the base: radical leaves simple 

 or with a pair of rounded lateral leaflets, round-cordate, entire or sinuate; 

 cauline pinnate, with 5-7 leaflets; leaflets from oblong or ovate to orbicular, 

 the terminal one much the largest, crenately toothed or lobed: flowers white, 

 20-25 mm. long, ascending, on ascending pedicels half as long: style short 

 or wanting. (C. vallicola Greene, Pitt. 3: 116. 1896.) Colorado, southward 

 and westward to Oregon. 



5. Cardamine pennsylvanica Muhl. in Willd. Spec. 3: 486. 1800. Glabrous, 

 erect, simple, or branched from the base, leafy up to the racemes of small 

 white flowers: basal leaves pinnate, with 9-17 small oblong-oval entire or 

 toothed leaflets; the leaflets of the upper leaves usually oblong with some- 

 what narrowed base decurrent upon the rachis: siliques linear, 20-30 mm. 

 long, erect when mature, on somewhat divergent pedicels. C. hirsuta. 

 Colorado to Montana and across the continent. 



14. PH YSARIA Gray. DOUBLE BLADDER POD 



Low and stellately canescent perennials with stems simple or branched 

 from the base, simple leaves, and yellow, racemose flowers. Siliques membra- 

 nous, the two cells inflated-globose and joined by the narrow septum. 



Constriction separating the cells equally deep above and below, cells 



globose . . . . ... . . . . . 1. P. didymocarpa. 



Constriction separating the cells much deeper above. 



Leaves lyrate or panduriform . . . . . . . 2. P. vitulifera. 



Leaves oblanceolate, sinuately toothed. 



Cells of silique spherical, small . . . . . . . 3. P. floribunda. 



Cells of silique flattened laterally, large 4. P. Newberryi. 



1. Physaria didymocarpa Gray, Wats. Bot. King's Exp. 20. 1871. Densely 

 stellate-canescent : leaves and stems rosulately crowded on the crown of the 

 thick root, 10-20 cm. high: radical leaves ovate to broadly spatulate, entire 

 or sinuately toothed, obtuse or acute, petioled; cauline oblanceolate to linear: 

 sepals lanceolate, surpassed by the large showy pale yellow petals: style 

 slender, persistent, 5-6 mm. long: silique deeply and equally notched above 

 and below; the cells 8-10 mm. in diameter, walls papery. Colorado to Brit- 

 ish America and far westward. 



la. Physaria didymocarpa lanata A. Nels. Bull. Torr. Bot. Club 31: 241. 

 1904. Much like the species but white-tomentose with a copious simple 



