176 CRUCIFER^. Thelypodium. 



T. Nuttallii, Watson. Glabrous and glaucous, branching above : leaves entire from lanceo- 

 late to linear-oblong, acute : pedicels 3 to 6 lines long : flowers ratlier large, lilac-colored, 

 nearly erect, all but the last usually opening some distance below the summit of the inflo- 

 rescence : petals 7 to 8 lines long : pods 2 inches or more in length, nearly erect upon the 

 spreading pedicels. — Bot. King Exp. 25, 26. Streptanthus sagittatus, Nutt. Jour. Acad. 

 Philad. vii. 12 ; Torr. & Gray, Fl. i. 666. — S. Idaho, on the Little Goddin River, Wyeth, to 

 Yakima Region, Washington, Brandegee ; Oregon, Nevius, Cusick ; N. Nevada and N. Utah, 

 Watson; Arizona, Ives, ace. to Watson. A species of considerable variability as inter- 

 preted by Dr. Watson, but difficult to render more definite, owing to NuttaU's brief descrip- 

 tion and fragmentary type. 



T. ambiguum, Watson. Smooth, glaucous, stout, erect, branching, 2 to 5 feet high, leafy : 

 leaves thick ; the radical coarsely and irregularly toothed, 4 to 8 inches long ; the upper 

 cauline and rameal oblong, subentire, acutish or obtuse and cuspidate : racemes elongated ; 

 pedicels 2 to 3 lines long, divaricate : floral envelopes rather deep purple, strongly contra.st- 

 ing with the bright yellow anthers : sepals oblong, smooth, 3 lines in length : petals fully 

 twice as long, with broad obovate patulous blade and slender claws : siliques slender, 3 to 4 

 inches long, widely spreading or somewhat deflexed ; stipe 1 1 to 2 lines in length. — Proc. 

 Am. Acad. xiv. 290, & Bibl. Index, 451 (excl. syn. in part). Streptanthus sagittatus, Gray, 

 Bot. Ives Rep. 6. — A showy but coarse species of N. Arizona, Newberry, Palmer, Lemmon. 



T. elegans, M. E. Jones. Habit and foliage much as in the preceding : cauline leaves 

 ovate or ovate-lanceolate, acutish, very glaucous : flowers opening at the summit of the 

 raceme, somewhat smaller : petals narrower and much paler purple : capsules very short- 

 stiped or sessile on the receptacle, sometimes suberect ; stigma distinctly bifid ; lobes nearly 

 erect, and standing over the placenta. — Zoe, iv. 265. — S. W. Colorado, Brandegee, 1875, 

 "common on adobe plains " near Westwater, Jones, 1890, and at Coal Mine, S. H. Camp, 

 1893 ; fl. May ; fr. June. A specimen from North Park, Crundall, may also be of this species, 

 but is too immature for certainty. 



++ ++ Flowers bright yellow. 



T. aureum, Eastwood. Glaucous biennial, branching from the base, somewhat pilose 

 below, 1 to 3 feet high : branches numerous, terete, slender, leafy : basal leaves oblanceolate, 

 dentate ; cauline ovate, deeply cordate-clasping, entire, an inch or more in length : racemes 

 rather dense ; pedicels spreading, ascending, in fruit about 3 lines in length : sepals oblong, 

 2 lines in length, obtuse, glabrous, yellow as well as the spatulate moderately exserted 

 petals: siliques well stiped, ascending, 2 to 2^ inches long. — Zoe, ii. 227. — Durango, 

 Colorado, Miss Eastwood ; fl. June. Exceptional in the color of the flowers but obviously 

 close to the preceding. 



H— -1— Petals very narrow, linear : cauline leaves narrowly oblong or linear. 



T. stenopetalum, Watson. Glabrous, much branched from the base, a foot or more in 

 height : branches slender, terete, ascending : leaves sagittate-auriculate, erect, 1 to 2 inches 

 long, acutish, somewhat fleshy: racemes elongated, many -flowered ; pedicels ascending, 

 thickened at the apex : buds lance-linear : sepals narrow, 5 lines long, purple, exceeded by 

 the long narrow apparently white or roseate petals : siliques slender, suberect, flexuous. — 

 Proc. Am. Acad. xxii. 468. — Stony hillsides. Bear Valley, San Bernardino Co., Calif., 

 Parish ; fl. June. 



* * * * Leaves sessile by a narrowed base or distinctly petioled, not auriculate. 

 -t— Inflorescence usually corymbosely branched : spikes very dense : pods widely spreading. 



T. integrif olium, Endl. Erect, glabrous : radical leaves ovate-lanceolate, varying greatly 

 in size, 1 to 8 inches long, half as broad, obtusish, entire or repand, contracted below into 

 petioles nearly equal in length ; upper cauline leaves lance-linear, sessile, acute, erect : spikes 

 very short, several to many ; pedicels crowded, divaricate, 1 to 5 lines long, commonly rigid 

 and somewhat thickened : pods slender, aljout an inch long, usually nodulose, sharp-pointed, 

 curved upwards; gynophore short, a fourth to half line in length. — Endl. ace. to Walp. 

 Rep. i. 172. Pachi/podium integrifolinm, Nutt. in Torr. & Gray, Fl. i. 96, 668 ; Hook. & Arn. 

 Bot. Beech. 321, t. 74 ; Torr. in Fre'm. Rep. 87. — Plains from Colorado and Nebraska to 

 S. California and Washington ; fl. in midsummer, rather common. 



Var. gracilipes, Robinson, n. var. Racemes more elongated, becoming 4 inches or 

 more in length : pods borne upon a slender gynophore (1 to 1^ lines long). — S. W. Colorado, 

 T. S. Brandegee, no. 1233. 



