MUSTARD FAAIILY 367 



Pods 2-3 cm. long; basal leaves oblanceolate or spatulate 



Petals 5-6 mm. long; blades spatulate: pedicels nearly erect. 



1. T, Palmeri. 



I'etals 7-9 mm, long; blades obovate; pedicels spreading or ascending, 



Fods 1-2 cm. long; basal leaves oval. 3 T ovali folium 



Petals 10-15 mm. long, about three times as long as the sepals. 



PoH« Ji^n^^^?"^ ^ ^^- 1?^S* ^^^^1^ 2 mm. wide. 5. T. Nuttallii, 



i^ods o-lO cm. long, arcuate, spreadmg or ascending. 



coars 



Trim 



nun. wiae. y ambiouum 



Stem slender; lower leaves entire or slightly sinuate; petals narrbivly spatuiate, 



-._ • , oareiy z mm. broad. 7 x piirnKmiim 



Upper leaf-blades attenuate at the base; leaves mostly laciniate. euco!>mum. 

 Petals narrowly linear-oblanceolate. 



Pods divergent ; raceme lax. q T levtosenalum 



Pods erect; raceme dense. 9 t miUenomm 



Petals spatulate ; pods reflexed ; raceme lax. 10. T\uiahense 



■ ?" iT" ^^^Pf^ %db. Biennial, with a taproot; stem 3-5 dm. high, spar- 

 ingly hirsute below, glabrous above; basal leaves 2-4 cm. long, more or less hir- 

 sute beneath, especially on the veins; stem-leaves sagittate, 2-4 cm. long gla- 

 k ^! or nearly so; inflorescence usually branched; petals white or rose; pod 

 about 2-5 cm. long, 1 mm. wide. Arid regions: s Utah. Son. 



2. T. sagittatum (Nutt.) Endl. Biennial; stem 3-6 dm. high, branched 

 aoove, glabrous or nearly so; basal leaves oblanceolate, 2-6 cm. long, glabrous 

 or sparingly hirsute; stem-leaves sagittate, 2-6 cm. long, glabrous; petals white 

 or purplish; pods 1 mm. wide, nearly erect, somewhat torulose. T. ■paniculatum 

 Tu u T, ^- i^^'^^osum Heller. Sage plains and alkali soil: Mont.— Colo — 

 Utah— Ida. Son.—Suhmont. Je-Au. 



t.v +" "5" o^^lifo^ium Rydb. Biennial or perennial, perfectly glabrous; stems 

 terete d-6 dm. high; earliest basal leaves about 5 cm. long, petioled, with broadly 

 oval blades, the later ones oblanceolate; stem-leaves sagittate, 2 cm. long, thick; 

 petals about 5 mm. long, with spatulate blades; pedicels in fruit 4-5 mm long 

 spreading; pods ascending, about 1 mm. wide, somewhat torulose. Plains: 

 Utah. bon. Au-S. 



4. T macropetalum Rydb. A glabrous perennial, 4-6 dm. high; basal 

 leaves oblanceolate or spatulate, 2-5 cm. long; lower stem-leaves oblong, obtuse, 

 sessile, 5-b cm. long; upper leaves lanceolate-sagittate, acute; pedicels divari- 

 cate petals purple, spatulate; pods 1 mm. wide, ascending or erect and some- 

 what mcurved. Hills and plains: Utah— Ida. Subtnont. My-Je. 



5. T. Nuttallii S. Wats. 



high; basal leaves .^1.^ pm 



dm 



long, petals hlac or whitish, 10-15 mm. long; pod nearly 2 mm. thick; style 1 

 mm. long, bireptanthus sagittatus Nutt. T. sagiUatum Heller, not Endl 

 i'lams and valleys : Wyo.— Utah— Ore.— Wash. Son. Jt^-Au. 



T.,r' 7< ^^biguum S. Wats. Stout biennial, glabrous; stem &-15 dm. high; 

 radical leaves thick, coarsely toothed, 1-2 dm. long, oblanceolate; stem-leaves 

 V^^\^:^^^' subentire; petals purphsh, about 1 cm. long; blade obovate; pod 

 ^ mm. thick; style very short. Arid regions: s Utah— Ariz. Son. 



1p«J' ^- ®"cosmum B. L. Robins. Glabrous biennial or perennial (?); lower 



onl ''^^^"S, entire or slightly sinuate, the upi>er lanceolate, clasping, 3-7 cm. 



K' ^^^^^^s several, many-flowered; pedicels 4-6 mm. long, spreading; petals 



My-Je °^™' ^^^'' ^ arcuate, ascending. Mountains: Ore.— Ida. 



4-fi^A J" ,*?P*osepaIum Rydb. Annual or biennial, glabrous throughout; stem 

 ^D am. high branched; leaves thin, glabrous, 6-10 cm. long, lyrate-pinnatifid, 

 bwL ^®°. *^ divergent lobes; petals with scarcely any distinction between 

 oiaae and claw, 8 mm. long, 0.5 mm. wide or less. Rocky banks: Ida. Son. 



inH^i J"' '^^^leflorum A. Nels. Glabrous biennial, 1-2 m. high; leaves coarsely 

 inflr. "^^Sularly dentate to entire, oblong or lanceolate below to linear above; 

 "uiorescence often 4-6 dm. Ions': flnwpr=! nTimprmi« oi-n^-^Ac^A- r^otQl= rxrh;^^ +„r;„^ 



