Sisymbrium. CRUCIFERiE. 91 



Stigma 2-lobcd. Siliques linear-ensiform, slii^htly falcate, pale purple. 

 Hook. — Sir William Hooker is inclined to refer to this species Cheirantlius 

 Pallassii, J^i/rsh, which is described as havinj^ rather terete siliiiues and a 

 subcapitate stigma, if his suspicion is confirmed, Pursh's specific name must 

 be adopted. 



3. //. Menziesii (Hook.): leaves spatulate, fleshy, covered with an ap- 

 pressed 2-parted pubescence; siliques (young) spreading; stem very short, 

 erect, simple. Hook. fl. Bar.- Am. 1. p. 60. 



California.— Root perennial, ligneous. Flowers larger than in the preced- 

 ing species, purple? Hook. 



13. SISYMBRIUM. Allioni ; DC. .9T/.9t.2. p. 458. 



Silique somewhat terete. Stigmas 2, somewhat distinct, or connate and 

 capitate. Sepals equal at the base. Seeds ovate or oblong. Cotyledons 

 sometimes oblique. 



§ 1. Siliques subulate, terminated with a short style : pedicels very 

 short, thickened and appressed to the axis after Jlowering. — Velarum, 

 DC. 



1. S. officinale (Scop.) : leaves runcinate, and, with the stem, hairy, 

 flowers very small (yellow). DC. prodr. 1. p. 191 ; Hook. fi. Bor.-Am. 2. 

 p. 61. Erysimum officinale, Linn. ; Piirsh, fl. 2. p. 436; Ell. sk. 2. p. 148. 



Road-sides and waste places, Canada ! to" Georgia; Oregon. May-Aug. 

 Introduced.— (1) Stem 1-3 feet high. Racemes elongated, curved in fruit. 

 Petals cuneate, longer than the calyx. Siliques 6-10 lines long, attenuate 

 into a short style. 



§ 2. Siliques terete : style very short : calyx spreading or erect : seeds 

 oblong. — Norta, DC. 



2. S. junceum (Bieb.) : leaves glabrous, glaucous; the lower ones petioled, 

 runcinately pinnatifid ; upper ones linear-lanceolate, entire. DC. prodr. 1. 

 p. 191 ; Hook.fi. Bor.-Am.. \.p. 61. 



Dry stony places on the Oregon, Douglas, and Rocky Mountains towards 

 the source of Salmon River, Mr. Wyeth. (fide Nutt.) Apparently identical 

 with the European plant. Nutt. 



3. S. linifolium (Nutt.! mss.) : glabrous; stem slender, simple; leaves 

 linear, undivided, the lower ones somewhat laciniately cleft (flowers large); 

 petals nearly twice as long as the calyx ; siliques linear and narrow. — Nas- 

 turtium linifolium, Nutt. ! in jour. acad. Philad. 7. p. 12. 



Plains of the Rocky Mountain range, towards the head-waters of the 

 Platte, Mr. Wyeth! May— 2j: Stem 8-12 inches liigh. Leaves all nar- 

 row, not glaucous : the axils often leafy. Silique about 2 inches long.— Very 

 near the preceding, but the flowers and siUques are larger. 



4. )S. pygmceum (Nutt. ! mss.) : dwarf, nearly smooth ; stem somewhat sim- 

 ple ; lower leaves somewhat lyrately pinnatifid, oblong ; upper ones entire, 

 linear ; petals longer than the calyx '; silique long and narrow.— Nasturtium 

 pumilum, Nutt. ! I. c. 



Head waters of the Missouri, in dry soils. Flowering early m the sprmg.— 

 11 Stem 3 inches high, slightly pubescent. Leaves attenuated at the base 

 into a petiole ; terminal segment rounded and obtuse. Flowers about 3 lines 

 long, in short racemes. 



