Sisymbrium. CRUCIFEE^. 139 



S. canescens, Nutt. (Tansy Mdstarp.) Annual, cinereous-tomentulose to pulverulent- 

 glandular or rarely glabrate and green : leaves very variable, always finely dissected, thin- 

 nish, and delicate : segments small, elliptical, or especially in the upper leaves linear-oblong : 

 racemes one to several, erect ; pedicels 3 to 5 lines long, spreading : flowers small, the spatu- 

 late petals equalling or somewhat exceeding the short oblong sepals : capsule 4 to 6 lines 

 long, erect or ascending, glabrous or nearly so ; seeds roughened. — Gen. ii. 68 ; DC. Syst. 

 ii. 475 ; Gray, Gen. 111. i. 152, t. 64. ^S'. Sophia, Pursh, FI. ii. 440, not Linn. ; Gray, Proc. 

 Acad. Philad. 1863, 57, in part. S. bmcliijcarpon, Richards, in Franklin 1st Journ. ed. 1, 

 App. 744 (reprint, p. 16). S. incanum, Bernh. in Fisch. & Mey. Ind. Sem. liort. Petrop. 

 1835, 38 (Ann. 8ci. Nat. ser. 2, iv. 337). ^S. Sophia, var. canescens, Hook. Fl. Autarct. ii. 242. 

 S. canescens, var. hrachycarpum, Wats. Bibl. Index, 69. S. canescens, var. alpestre, T. D. 

 A. Cockerell, Bull. Torr. Club, xviii. 168 (so far as the brief characterization shows). S.pin- 

 natum, Greene, Bull. Calif. Acad. Sci. ii. 390, not Barn. Erysimum pinnatiiin, Walt. Car. 

 174. Cardamine 1 multifida, Pursh, Fl. ii, 440. C? Menziesii, DC. Syst. ii. 267. Nastur- 

 tium multijidum & Menziesii, Spreng. Syst. ii. 883. Descurainia canescens, Prantl in Engl. & 

 Prantl, Nat. Pflanzenf. iii. Ab. 2, 192. D. pinnata, Britton, Mem. Torr. Club, v. 173. — 

 Common and widely distributed, Florida to S. California, northward to lat. 66° according 

 to Macouu. The numerous forms distinguished by Torr. & Gray and others appear com- 

 pletely confluent. (Mex.) 



S. Cumingianum, Fisch. & Met. Leaves thickish, less finely dissected, densely canes- 

 cent-tomentose : pods longer, more slender and acute, finely pubescent, 6 to 9 lines long, on 

 spreading pedicels of similar length. — Ind. Sem. Hort. Petrop. 1835,38; Fournier, 1. c. 

 63. — Not infrequent in canons, &c. of New Mexico, Wright, Greene, and Arizona, Palmer, 

 Rothrock. (Adj. Chihuahua, Hartman ; S. Am.) The type from Chili has more finely dis- 

 sected leaves, but is connected with other forms of Uruguay, &c., closely like our own. 

 -t— •»— Capsules very slender, half to two thirds line in diameter ; seeds uniseriate in the 

 cells (or obscurely biseriate in short-podded forms of S. incisum). 



S. Sophia, L. Slender branching annual with the habit of the preceding : leaves tripinnate 

 with small linear or lance-linear segments : racemes elongated, especially the terminal one ; 

 pedicels filiform, half inch long, spreading : siliques 9 to 1 1 lines long. — Spec. ii. 659 ; Torr. 

 & Gray, Fl. i. 92; Hook. f. Arct. PI. 286, 319; Wats. & Coulter in Gray, Man. ed. 6, 72. 

 Descurainia Sophia, Webb, ace. to Prantl, 1. c. — In certain localities sparingly introduced, 

 across the continent, more common in Canada. (Adv. from Eu.) 



Var. SOphioides, Benth. & Hook. Leaves somewhat less finely divided : fruiting 

 racemes very short and dense, umbelliform : pods an inch or more in length. — Gen. i. 78 ; 

 Trautv. Act. Hort. Petrop. v. 25. S. Sophia, Cham. & Schlecht. Linnsea, i. 28, not L. 

 S. sophioides, Fisch. in Hook. Fl. Bor.-Am. i. 61, t. 20; Torr. & Gray, Fl. i. 92. — Brit. 

 America from Lake Winnipeg, Back, ace. to Macoun, to the Arctic Ocean. (Kamtsch., 

 Siberia.) 



S. incisum, Engelm. Delicate annual, subglabrous or more frequently finely glandular- 

 puberulent or stellate-tomentulose, scarcely canescent : leaves thin, pinnatifid to bipinnatifid ; 

 segments varying greatly in contour: racemes elongated; pedicels 2 to 3 lines long, spread- 

 ing, exceeded by the sharp-pointed spreading or curved-ascending capsules ; the latter 

 glalirous or nearly so. — Engelm. in Gray, PI. Fendl. 8 ; Torr. Pacif. R. Rep. iv. 66 ; Fournier, 

 1. c. 64, incl. var. /3, hygrophilum ; Brew. & Wats. Bot. Calif, i. 41. Descurainia incisa, Brit- 

 ton, Mem. Torr. Club, v. 173. — The typical form extends from New Mexico to S. California 

 and northward to N. Nevada and Winnipeg. The species is polymorphous as to foliage, 

 pubescence, and length of pods. The chief varieties are 



Var. Hartwegianum, Watson. Leaves pinnate ; the leaflets narrowly oblong or 

 lanceolate, obtuse, and ol)tusely or acutely toothed : pods short, Ii to 3 lines in length, erect, 

 borne upon ascending or appressed pedicels of equal length, in a usually crowded raceme ; 

 seeds sometimes irregularly l)iseriate. — Bot. Calif, i. 41. «S. canescens, Beuth. PI. Hartw. 

 9, not Nutt. ? S. canescens, var. brevipes, Torr. & Gray, Fl. i. 92. S. Sophia, Gray, Proc. 

 Acad. Philad. 1863, 57, in part. '} S. brachycarpum. Hook. & Arn. Bot. Beech. 323.— 

 Colorado to Moose Jaw, Northwest Territory, ace. to Macoun, westward and southwestward. 

 S. Californicum, Wats. Bot. King Exp. 23 (Smeloivskia ? Californica, Gray, Proc. Am. Acad. 

 iv. 520), is merely a form with exceptionally short capsules. 



