2g CRUCI1'ER.E. 



7. Streptanthua. Aiithera eloiit,':iled, sagittate at base. I'efcils ottcii without a dilated blade, 



iiiuie or k'ss twisted or undulate, the claw channelled. I'alyx dilated and u.iually 

 colored. Seeds in one row. 



8. Cheiranthus. I'etals with a broad Hat linili and liuij,' daw. Calyx huge, not colored. 



Seuv.ls in one row, not margined. 



• » I'od terete or l-angled, .slightly or not at all ('oiniiri'..s.sed : 8oed.s not margined ; i-otyledons 



incunibent or more or loss oblique, 

 -t- Pod long-linear (1 to 4 inches) ; valves 1 -nerved : seeds in 1 row, oblong, somewhat flattened ; 

 cotyledoii.-i mostly more or less obliiiue : anthers linear. Wlout biennials or perennials. 

 +t Flowers white to purjile : anthei-s sagittate. 



9. Caulanthus. Petals with a broad claw, somewhat dilated above and undulate, little longer 



than the broad scjials, usually jiurple. Filaments included. Stigma nearly sessile, some- 

 what 'i-lobed. Pod sessile, 3 inches long ur moie. 



10. Thely podium. Petals with narrow claw and flat linear to rounded limb, much exceeding 



the nariow sepals, white or rose-color. Filaments often e.xserted. Style short ; stigma 

 mostly entire. I'od shorter, sessile or short-stipitate. 



+t +t Flowers yellow. 



11. Stanley a. Pod somewhat terete, long-stipitate. Stigma sessile, entire. Anthers not 



siigittate, spirally coiled. Leaves petioled, entire or pinnatifid. 



12. Erybiinum. Pod 4-angled, .sessile. Stigma 2-lobed. Anthers sagittate, not coiled. 



Leaves narrow, entire or reitandly toothed. 



+- +- Pod linear, mostly less than an inch long, more or less -l-angled ; valves 1 - 8-nerved : 

 seeds glol)Ose to oblong, smaller and less flattened, in one row {exce|)t one species of 

 iSiij/mbrium): anthers oolong to linear-oblong : flowers yellow (white in Smelowsliia) : at 

 least the lower leaves pinnatifid. 



13. Brassica. Pod nearly terete, with a long stout beak. Seed globose ; cotyledons infolding 



the radicle. Anthers long, sagittate. 



14. Barbarea. Pod pointed, somewhat 4-angled. Seeds oblong; cotyledons nearly accumbent. 



Anthers short, oblong. Leaves lyrately pinnatifid. A smooth marsh perennial. 



15. Sisymbrium. Pod nearly terete, short-iiointed or obtuse. Seeds small, oblong; cotyle- 



dons incumbent. Anthei-a linear-oblong, sagittate. Mostly annual, often with finely dis- 

 sected leaves. 



16. Smelo\vskia. Pod short, 4-anglod, pointed at each end. Flowers white or pinkish. 



Alpine perennials with narrowly i)innatifid leaves ; otherwise as iiisi/)nbrii(m. 



-1- -H -t- Pod oblong-cylindrie to globose; valves strongly convex, nerveless: seeds in 2 rows; 

 cotyledons accumbent. 



17. Nasturtium. Pod oblong or short-linear. Flowers white or yellow. Smooth or somewhat 



hispid. 



18. Vesicaria. Pod ovate to globose. Seed flattened. Flowers yellow. Densely stellate- 



canescent. 



♦ ♦ ♦ Pod more or less obcomi)ressed, i. e. flattened contrary to the partition, which is narrower 



tlian the valves : seeds not winged. 



-H Valves 1-nerved or obtusely carinate, not winged : cells several-seeded : cotyledons incunibent : 

 flowers white (or yellow in 2'ro2)idocarp^u7n). 



19. Subularia. Pod ovoid, slightly obcom pressed. A dwarf stemless aquatic, smooth, with 



tufted subulate leaves. 



20. Tropidocarpum. Pod linear, often 1 -celled by the disappearance of the narrow partition. 



Slender hirsute annuals with j)innatitid leaves and axillary flowers. 



21. Capsella. Pod obcordate or oblong, much compressed, many-seeded ; valves carinate. 



Nearly smooth annuals. 



+■ 4- Vnlvos acutely x'liinato or winged : cells few- (1 -5-) seeded : cotyledons accumbont and 

 flowers while (or in JajhiHuiil cotyledons mostly incumbent und in one species the flowers 

 yellow). 



22. Lyrocarpa. Pod fiddle-shaped, flattened, somewhat acutely carinate ; cells 6-seeded. 



Pubescent annuals. 



23. Thlaspi. Pod cuneate-oblong ; valves sharply carinate ; cells 2-4 seeded. A smooth 



alpine perennial ; leaves entire. 



24. Lepidium. Pod orbicular or obovate, 2-winged at the summit ; cells 1 - 2-seeded. 



-1- -t- -f- Valves inflated, nerveless : cells several-seeded : cotyledons accumbent : flowers yellow. 



