MUSTARD FAMILY 369 



spreading; anthers linear, curved and spirally coiled. Pods long-stipitate, 

 elongate-linear terete; valves l-ner\'ed. Stigma sessile, small, simple. Seeds 

 in one row, oblong; cotyledons incmnbent. 



Middle cauline leaves sessile by an auriculate base. 



Stem winged ; petals greenish. 1 s mriiliilnrn 



Stem not winged: petals yellow. 2 S conferUnora 



Middle caulme leaves petioled or sessile with a narrowed base conjenijiora. 



Flant white-viUous. o o ,„^^„,„ 



Plant not white-viUous. ^- '^- ^<^^entosa. 



Blades of the petals linear-oblong to elliptic, bright yellow 



Blades of the petals one-tliird to two-thirds as long as the claws 

 Pod arcuate, not tortuose. 

 Leaves sparingly hirsute. 



Filaments hairy; lower leaves pinnatifld, with lanceolate or oblonK 



lODes. ^ g vinnata 



Filaments glabrous ; lower leaves runcinate, with triangular lobes 



Leaves glabrous. f " f 'S^'«- ' 



Pod decidedly tortuose. 6 S bini^lnfn 



Blades of the petals as long as the claws. mpmnata. 



Leaves glabrous. 



Leaves broadly lanceolate, the lower with short broad lobes; blades 

 of the petals oblong; pod ascending. 8 S inteorifoliti 



Leaves linear-lanceolato. usually all entire ; blades of the petals broadlV 

 elliptic; pod recurved. g A arnmtn 



Leaves finely puberulent. 10 s canescen'i 



Blades of the petals rouuded-oval, ochroleucous. \\\ %'. albescens. 



1. S. viridiflora Nutt. Stem glabrous, 3-10 dm. high: basal and lower 



W-'!.';JTfo^^?™'''f'" short-pubescent, 7-20 cm. long, oblanceolate or spatu- 

 late, petals 12-15 mm. long; claws subulate, about as broad as the linear blades; 

 toSo^. £f ™"',' stipe 5-8 mm. long; pod spreading, somewhat arcuate and 

 torulose, ^5 cm. long S. heterophylla Nutt. Bare hills: Wye— Mont.— Ore 

 -iNev. CiubinorU. My-Jl. 



h{J: ?' <5p?i^ertiflora (B. L. Robins.) Howell. Stem glabrous, terete 

 mm 'ln^ eaves glabrous 4-6 cm long, oblanceolate; petals yellow, auout l:s 

 mm long; claw about equalling the linear blades; pods 4-5 cm. long, ascending 

 not torulose; stipe about 6 mm. long. Foot-hills: Ida.-Ore. Submont. Ap-M?: 

 3. S. tomentosa Parry. Stem terete, woolly below, 8-15 dm. high aneled 

 Ton J-1 r^7 ^^^^^^ ^^^^^^^^ pinnatifld; terminal segment lanceolate, 3-7 cm. 

 Pmfnll ni'^y? segments ovate-oblong; petals cream-colored; pedicels of the pod 

 equalling the stipe. Dry slopes: Wyo. Submont. ^ 



hiffh" f.;?/'"'}*** ^^1^\-'^ Britton. Stem sparingly hairy or glabrate, 3-10 dm. 

 S ,u' ^""^^^^ *^'"?''' conimonly pmnatifid, with oblong or lanceolate divi- 

 fi^7^nr^^ '^PP'"'" ^'?^'^^' '^°^'' ^'^ ^^^^ pubescent; petals 10-15 mm. long; pod 

 V J :^If' spreading; stipe 10-15 mm. long, twice as long as the pedicels 

 S. mnnahfida Nutt. Plains: S.D.-Neb.— Utah. Plain. RIy-Au. P^"'*"^'^- 



lon^lf;.!^"/''^^**.?^''^^- Stem stout, glabrous; basal leaves about 2 dm. 

 halS I.k! K '^.^"t^e, runcmately divided, softly pubescent, with long white 

 obKnopni.; ""^^^ triangular or the lowest ones oblong; stem-leaves ovate to 

 mm wf^! i^' "^ore glabrous; pods almost erect and straight, 6-7 cm. long, 1.5 

 iS Son ^P^^^^'^^ Pedicels a'^o^t 1 f^ni- long. (?) S. vara A. Nels. Plains: 



6. S. bipinnata Greene. Stem flexuose, 2-6 dm. hieh terete fflihrnii<^- 



peS v^Sw ^1 ^r ™°f P^'""^^'^?'!' ^'"'^ «^^-S - I-earoftenTot;! dtisioSi 

 7-8 mm fe i^ '^"'- '"ir^' ^?r^ ^^..™^- ^''"S' '«™l««e ^nd tortuose; sti 

 Colo -^Kans ' PzSf XaII"^ pedicels. Plains and dry draws: Wyo. 



dm^ion^^!^'"*'* ^\^^- •^'^"J-iT^ '^^Z ^^g^' Wuish green; lower leaves 1-1.5 

 SninT'n if ^'^ ¥^, pmnatifid, with linear-lanceolate or oblong lobes, the 

 WeoKtP- !: i^i"'i"*'^' ^""^?f than the rest; upper leaves usually entire, U^ear- 

 ahmftl l ' Pi ^ lemon-yellow, about 1 cm. long; claws pubescent; pedicels 

 abmit K 1 '^^' more or less spreading; stipes about 1.5 cm. long; pod proper 



land,- P.7- '''A?Tit"'^4^^ mra^ thick, somewhat arcuate. Drj- hills and table- 

 lands. Colo.— N.D.— Wyo. Plain— Submont. 



4-6 



16 



