(MUSTARD FAMILY.) 19 



the largest, entire or coarsely sinuate-toothed or lobed, often cordate at base ; 

 radical leaves mostly simple and cordate-reuiform : pods obtuse or scarcely 

 beaked with a short style, ascending. Proc. Am. Acad. x. 339. C. pau- 

 cisecta of Hayd. Rep. 1870, 1871, 1872. From Wyoming to California and 

 Oregon. 



3. C. hirsuta, L. Stem 3 to 12 inches high, erect or ascending from a 

 spreading cluster of root-leaves : leaflets 3 to 7 pairs, rounded ; those of the 

 upper leaves oblong or linear and often confluent: flowers small: pods erect of 

 ascending in line with the pedicels ; tyle very short or almost noiie. From 

 Colorado to Alaska and eastward across the continent. 



3. PARRYA, R. Br. 



Style rather short ; lobes of the stigma connate. Seeds flat, orbicular, with 

 a broad membranous border. Low herbs, with thick perennial roots and 

 numerous scapes with racemed flowers. 



1. P. nudicaulis, Regel. Rootstock fusiform: scape 4 to 6 inches 

 high : leaves broadly lanceolate, incisely toothed : petals rose-color or purple, 

 retuse : pods broadly linear, erect, slightly incurved, somewhat constricted 

 between the seeds, which are slightly corrugated. 



Var. aspera, Hegel. Pilose with glandular hairs. 



Var. glabra, Regel. Whole plant glabrous. Both varieties are included 

 in the P. macrocarpa. of Bot. King's Exp. 14 and Torr. & Gray, Fl. i. 88. 

 Near the summit of one of the highest peaks of the Uiutas { Watson). 



4. ARAB IS, L. ROCK CRESS. 



Anthers short, hardly emarginate at base. Stigma entire or somewhat 

 2-lobed. Pod linear. Seeds flat and usually winged. Erect, with perpen- 

 dicular roots and undivided leaves, the cauliue usually clasping and auricled 

 at base. 



# Biennials : pods erect or ascending : flowers small, white or nearly so. 



1. A. perfoliata, Lam. Glaucous: stem stout, usually simple, 2 to 4 

 feet high, mostly glabrous but often hirsute toward the base : lower leaves spatu- 

 late, sinuate-pinnatlfld or toothed ; the cauliue entire, ovate or ovate-lanceolate, 

 clasping by the sagittate base : petals little exceeding the sepals : pods erect and 

 usually oppressed, narrowly linear; style short: seeds in two roivs, narrowly 

 winged or wingless. Across the continent and fur northward. 



2. A. hirsuta, Scop. Rough-hairy, sometimes smoothish, 1 to 2 feet high : 

 leaves often rosulate at the base ; the cauline ovate to oblong or lanceolate, 

 entire or toothed, partly clasping by a somewhat sagittate or cordate base : petals 

 greenish-white, longer than the sepals : pedicels and pods strictly upright ; style 

 scar cell/ any : seeds in one row, wingless. Colorado and northward, and east- 

 ward across the continent. 



3. A. spathulata, Nutt. Hirsute, dwarf and somewhat cespitose, about 

 4 inches high : root thick, crowned with vestiges of former leaves and stems : 

 leaves spatulate-oblong, entire; radical leaves on rather long petioles: petals 

 al>out twice the length of the sepals: pedicel about half the length of the pod, 

 which is rather short, diverging, pointed with a distinct slender style : seeds with 



