4-1 CRUCIFER.E. arabis. 



A. Breweri Watson Proc. Am. Acad, xi, 123. Stems several from a 

 branching perennial caudex 4-12 inches high, more or less villous with 

 spreading simple or branched hairs or stellate pubescent towards the base, 

 lower leaves narrowly oblanceolate, entire or toothed, finely stellate-pub- 

 escent, an inch long or less, the petioles often ciliate ; upper cauline leaves 

 lanceolate to narrowly oblong, sessile with a cordate base or obtusely au- 

 riculate, somewhat villous or pubescent or nearly glabrous; flowers bright 

 rose-color or purplish to nearly white, 3-4 lines long; the pedicels and pur- 

 plish calyx more or less villous : pods at length spreading and more or less 

 arcuate l)fe-3 inches long by a line or more broad, acute with a sessile 

 stigma ; valves 1 -nerved, veined : seeds orbicular, narrowly winged. South- 

 western Oregon to middle California. 



A. Lemmoni Watson Proc. Am. Acad xxii, 467. Stems several from a 

 branching perennial caudex, slender, 6 inches high or less, glabrous above, 

 hoary below with fine dense stellate pubescence : lower leaves spatulate- 

 oblanceolate, rarely with one or two teeth, 6-9 lines long, the petioles 

 sometimes ciliate; cauline leaves oblong-lanceolate, auriculate, mostly gla- 

 brous or nearly so: flowers 2-3 lines long, rose-colored; sepals pubescent: 

 pods ascending or widely spreading, on short pedicels glabrous, curved 1- 

 2 inches long by % of a line broad, more or less attenuated to a sessile 

 stigma or short style : seeds in one row, orbicular, narrowly winged. In 

 the mountains from northern California to Mount Adams Washington, 

 Nevada, Wyoming, Montana and Brit. Columbia. 



A. Koelileri (In honor of R. Koehler of the S. P. R. R., who has 

 shown me many favors while botanizing in Oregon). Stems slender, 

 3-6 inches high from a perennial much branched woody caudex: lower 

 leaves densely rosulate at the ends of the branching caudex, persistent, 

 linear-lanceolate to spatulate, narrowed below T but scarcely pet- 

 ioled, 6-12 lines long entire, canescent with stellate pubescence; cau- 

 line leaves only one or two, broadly subulate, auriculate : racemes few- 

 flowered ; flowers scarlet 4-6 lines long: pods 2-3 inches long, a 

 line broad, often arcuate, erect on slender pedicels ; style very short or 

 none: seeds small, narrowly winged. On cliffs, etc., in the Coast Mount- 

 ains of Douglas county, Oregon and along the Umpqua river at Roseburg, 

 flowering early. 



A. Lyallii Watson Proc. Am. Acad, xi, 122. Glabrous throughout or 

 sometimes stellate-pubescent below: stems several or many from a 

 branched perennial caudex, 2-10 inches high : lower leaves spatulate to 

 linear-oblanceolate, usually 6-12 lines long, sometimes 2-3 inches long: 

 the cauline narrowly lanceolate to oblong, sometimes scarcely auricled : 

 flowers rose-color, 2-3 lines long; sepals glabrous: pods erect or ascending, 

 straight or nearly so, 1-2 inches long by %-l line broad, narrowed, to a 

 short style or sessile stigma ; valves 1 -nerved, at least to the middle, 

 veined : seeds orbicular narrowly winged in 1 row. On the highest peaks 

 of the Cascade Mountains from Brit. Columbia to California, Montana 

 and Utah. 



A. liiicrophylla' Nutt. T. & G. Fl. i, 82. Stems slender, 2-6 inches 

 high from a slender branching perennial caudex, somewhat hirsute at base 

 with spreading hairs or nearly glabrate : lower leaves stellate pubescent, 

 linear, acutish, 4-6 lines long; cauline leaves few, sessile linear-lanceolate 

 to narrowly oblong: racemes few-flowered : flowers pale rose-color to pink, 

 2-3 lines long: pods only 2-6 at the ends of the filiform branches, erect, 

 1-2 inches long by %~% of a line wide : seeds small, slightly winged. 

 On rocky banks, eastern Oregon to Wyoming and Utah. 



A. Cuslckll Watson Proc. Am. Acad, xvii, 363, Yillous-hirsute with 

 scattered spreading mostly simple hairs. Stems usually several from a 

 biennial (?) root, 6-10 inches high, simple hirsute or glabrate above: rad- 

 ical leaves linear-oblaneeolate, hirsute and ciliate, 8-12 lines long; the up- 



