IQO CllUCIFEK.E. 



3. THYSANOCARPUS. Flowers small. Sepals ovate, rounded, spreading. Petals spat- 

 ulate. Stamens iu5 in the kvst. Style slender, short or rarely absent; stigma simple. 

 Ovule solitary. Fruit winged. Pubescence simi>le or none. 



* * * Fruit orbicular or nearly so, 2-cclled, dehiscent, 2-several-seeded : filaments often 

 dilated and toothed or appendaged near the base. 



4. BERTEROA. Sepals oblong, rounded at the apex. Petals obovate, bifid, cuneate 

 below. Stamens 6; filaments somewhat appendaged upon the inner surface near the base. 

 Stvle slender, rather long. Stigma essentially simple. Pods fiat, often tomentose. Seeds 

 several in each cell, winged or margined. Pubescence stellate, not appressed. 



5. LOBULARIA. Sepals short, ovate, spreading in anthesis. Petals obovate, cuneate, 

 ' entire. Stamens 6 ; filaments slender, rarely dilated below, not toothed. Silicel small ; 



valves flat or slightly convex. Style slender ; stigma subsimple. Cells few-seeded. Hairs 

 2-parted and appressed. 



6. ALYSSUM. Sepals short, ovate or oblong, more or less spreading. Petals obovate, 

 cuneate to spatulate or linear, entire or slightly retuse at the summit. Stamens 6 ; fila- 

 ments commonly more or less dilated at the l)ase and toothed. Capsule with valves convex. 

 Pubescence densely stellate. 



Tribe II. PIIYSARIEiE. Fruit a silicel, 2-celled, completely dehiscent, either very 

 turo-id with broad partition and ahiiost hemispherical valves, or didymous, or 

 strongly obconipressed with narrow partition and conduplicate. Cotyledons 

 accunibent. Pubescence stellate. 



* Silicel subglobose ; partition broad, snborbicular. 



7. LESQUERELLA. Sepals oblong or elliptical, rather short, equal at base, erect or 

 spreading, usually pubescent. Petals longer, spatulate to oblongobovate, entire. Stamens 

 6 ; anthers linear, sagittate ; filaments rarely dilated or winged at the base. Style slender; 

 stigma entire or nearly so. Pods mostly very turgid; cells 2-16-seeded; septum nerved 

 from the top to the middle. Seeds rarely margined. 



•* * Silicel didymous or obcompressed ; partition narrow, elliptical, oblong or linear. 

 -1— Seeds several to many. 



8. PHYSARIA. Floral envelopes and andrrecium of the preceding. Style slender. Fruit 

 more or less strongly didymous and inflated or sometimes ratiicr strongly obcompressed, but 

 the cells at least somewhat turgid at maturity. 



9. SYNTHLIPSIS. Sepals oblong, spreading in anthesis. Petals longer ; blade flat, obo- 

 vate; claw rather short. Stamens 6, unapi)ondaged. Style .^lender; stigma simple. 

 Capsule elliptic-oblong, very strongly obcompressed ; valves sharply carinate, not auriculate 

 or wing-appcndaged. Seeds about 10 in each cell, neither margined nor winged. 



10. LYROCARPA. Sepals linear or linear-oblong, acute or acutish, erect, eciual at base. 

 Petals long, linear to obovate, sometimes twisted. Stamens six, free, unappendaged. Style 

 short or none ; stigma rather large, entire or somewhat lobed ; the lobes lying over the 

 valves. Capsule very strongly obcompressed, oblong and biauriculate at the apex, or short, 

 broad and obcordate. Septum narrow, linear. 



H— -1— Seeds solitary in each cell. 



11. DITHYREA. Sepals ovate or oblong, erect or spreading, pubescent. Petals conspicu- 

 ous, broadlv spatulate, with spreading blades and slender claws. Stamens 6, free and 

 unappendaged ; anthers linear, sagittate. Pods very strongly obcompressed and didymous ; 

 cells suborbicular ; septum very narrow and shorter than tlie cells. Style almost none; 

 stigma rather large, somewhat ovate, simple. 



Tribe ITT. LEPIDINEiE. Fruit a 2-celled silicel, strongly obcompressed (except in 

 the aquatic genus Suhularia). Cotvledons incumbent or accumbent. Pubescence 

 wholly simple or none. 



* Fruit strongly obcompressed, dehiscent; cells 2-several-sceded ; cotyledons accumbent: 

 terrestrial and glabrous. 



