Thehjpodium. CRUCIFER^. 175 



narrowed at the base ; cauline lance-linear, attenuate, sagittate-auriculate, erect and usually 

 appressed, seldom an inch long ; racemes 4 to 6 inches in length ; buds and flowers ascend- 

 ing ; pedicels 1^ to 2 lines long : sepals oblong, usually purplish tinged ; the lateral distinctly 

 saccate at the base : petals narrow, crisped, nearly twice as long as the calyx : capsules 

 slender, 12 to 15 lines in length, slender-beaked. — Proc. Am. Acad. xxi. 445. — At Camp 

 Polk and in Harvey Valley, Oregon, Howell ; fl. June. 

 T. eucosmum, Robinson, n. sp. Biennial or perennial, glabrous : cauline leaves oblong 

 or lanceolate, entire, spreading, 1 to 3 inches long : racemes several, very many-flowered ; 

 pedicels 2 to 3 lines long : buds and flowers widely spreading, usually horizontal, deep 

 purple : petals spatulate, 4 lines long: pods arcuate, ascending, IJ to IJ inches long (not 

 mature). — A very attractive species of Oregon, first collected at Baker City, R. D. Nevius, 

 1875, and later in the Blue Mts., T. Howell, 21 May, 1885, no. 345. 



H— -I— Flowers opening close to the summit of the inflorescence, while still corymbosely 

 clustered. 



T. sagittatum, Endl. Biennial, usually branched from the base, often somewhat hispid- 

 pubescent below, quite smooth above, glaucous : stems subsimple, ascending or nearly erect, 

 moderately leafy : leaves entire ; the radical spatulate, 1 to 3 inches long ; the cauline 

 ovate-lanceolate to lance-oblong, sagittate-clasping with bluntish auricles : sepals about 2 

 lines long, but half the length of the roseate or purplish petals : fruit erect or spreading, 

 often somewhat incurved, torulose and tipped with a slender style. — Endl. ace. to Walp. 

 Rep. i. 172 ; Wats. Bot. King Exp. 25, in part; Brew. & Wats. 1. c. Packi/podium sagitta- 

 titm, Nutt. in Torr. & Gray, El. i. 97. — S. Utah, Palmer, to the Yellowstone Park, Tiveedy, 

 and Montana, Watson ; in the " Snake Country," Tolmie, and Rocky Mts. of the Northwest, 

 Nuttall, Burke. Said to prefer moist alkaline soil. 



T. flexuosuni, Robinson, n. sp. Stems slender, weak, and subdecumbent, flexuous, nearly 

 naked above : radical leaves numerous, lanceolate, including the slender petioles 4 to 6 

 inches in length ; cauline leaves distant, all or at least the upper much reduced, linear- 

 oblong or lance-linear with narrow acutish auricles : flowers and fruit nearly as in the 

 preceding. — T. sagittatum, Wats. Bot. King Exp. 25, in part; Anderson, Cat. 117; not 

 Endl. — In alkaline soil among sage brush, &c. Nevada, near Carson City, Anderson, 

 no. 140, Truckee Valley, Watson, no. 108; California, Surprise Valley, Modoc Co., Lenunon; 

 Oregon, Union Co., Cusick, no. 921, Harvey Valley, Howell, no. 341. 



T. (?) salsugineum, Robinson, n. sp. A low branching annual, glabrous and glaucous 

 throughout ; stems slender, terete, often flexuous : cauline leaves ovate to oblong, half inch 

 to inch and a quarter in length, entire, obtusish : flowers small : petals white or nearly so, a 

 line to a line and a half in length : pods 6 to 8 lines long, erect on spreading pedicels. — 

 Sisi/mbriujn salsugineum. Pall. It. ii. App. no. 114, t. 5 ; Ledeb. Fl. Ross. i. 185. S. glaucum, 

 Nutt. in Torr. & Gray, Fl. i. 93. Turritis salsiiginea, DC. Syst. ii. 212. T.{1) diffusa, 

 Hook. Fl. Bor.-Am. i. 41. — Rocky Mountains from Colorado at South Park, Porter, to 

 Brit. America and the shores of the Arctic Sea, Richardson, ace. to Hooker, 1. c. Appar- 

 ently the same as the plant of Central Asia, but too little known in its American occurrence : 

 scarcely differing from other Thelypodia except in its low slender habit and exceptional 

 range, but very distinct from any American Sisymbria. 



* * * Leaves as in the preceding : pedicels developed (2 to 6 lines long): siliques elon- 

 gated, usually 2 to 4 inches long, generally arcuate-spreading or somewhat deflexed. 



H— Petals with a distinctly developed blade, obovate or spatulate. 

 ++ Flowers white or purplish. 

 T. Vaseyi, Coulter. Rather slemler, erect, glabrous and glaucous, branching from near 

 the base : branches terete, leafy : cauline leaves obovate, obtuse or rounded at the apex, thin, 

 narrowed toward the clasping base, repand-dentate : flowers very small, a line and a half in 

 length, white, closely aggregated at the summit of the axis : fruiting racemes lax : pods 

 rather few, 2 inches long, very slender, nearly erect on ascending pedicels 3 or 4 lines in 

 length. — Contrib. U. S. Nat. Herb. i. 30, ii. 15, t. 1, as to pi. Nealley, the first mentioned 

 type, not pi. Vasey, which is a Sisymbrium with much shorter fruit. In tlie plate, the stem 

 on the left and the fruiting branch are of pi. Nealley. — A very interesting species as yet 

 only collected near Rio Grande City, Nealley, evidently nearly related to T. salsugineum, 

 from wbich it differs cbiefly in its larger leaves and longer fruit. 



