CRUCIFER.E. 101 



12. THLASPI. Sepals short, oval, obtuse, thin-margined, erect or slightly spreading. 

 Petals ol)Ovate or oblauceolate, entire. Stamens free, uuappendaged ; anthers short, oval. 

 Style slender or sometimes none ; stigma small, entire or slightly emargiuate. Capsule 

 orbicular, elliptic-oblong, or oblauceolate ; the valves very strongly and usually sharply 

 keeled, often winged especially toward the apex. 



* * Fruit strongly obcompressed or didymous ; cells usually I seeded ; cotyledons incum- 

 bent (except in Lepidiuni Mrf/inicum) : terrestrial. 



13. LEPIDIUM. Sepals short, ovate or elliptic-oblong, obtuse, equal at base, more or less 

 spreading. Petals obovate or oblauceolate-spatulate, entire, rounded at the apex, sometimes 

 abortive or none. Stamens free, uuappendaged, all six present or by abortion the smaller 

 ones absent, or through further simplification only two stamens present, each representing 

 one of the longer pairs. Style slender and more or less elongated or stigma sessile. 

 Capsule orbicular, ovate, or elliptic-oblong, often notched at the apex, regularly dehiscent ; 

 valves very strongly compressed and sharply keeled, often wiug-appendaged especially 

 toward the apex, not thickened nor sculptured. Ovules pendulous from near the apex of 

 the cells. 



14. SENEBIERA. Sepals oval, equal at base, spreading, often fugacious. Petals obovate, 

 or more or less abortive, short, linear, or subulate. Stamens free and uuappendaged, all 

 6 present or onh' 4 or 2 as in the preceding ; anthers short, somewhat didymous. Stigma 

 sessile, uearly or quite simple. Fruit more or less distinctly didymous ; the valves thickish, 

 often sculptured or tuberculated, falling off as 1-seeded closed or nearly closed nutlets. 

 Embryo folded morphologically above the base of the cotyledons. 



* * * Fruit turgid, subglobose, pyriform or short fusiform, dehiscent, several-seeded; 

 cotyledons incumbent : aquatic with subulate leaves. 



15. SUBULARIA. Sepals ovate, equal, obtuse, spreading. Petals oblong or spatulate, 

 entire, without sharp distinction of blade and claw. Stamens 6, scarcely unequal, free and 

 uuappendaged ; anthers oval. Stigma sessile, slightly 2-lobed. Seeds few, 2-rowed in the 

 cells. Embryo folded morphologically above the radicle, the curvature being in the cotyle- 

 dons, not between them and the radicle uor in the latter. 



Tribe IV. CAMELINE^E. Fruit short, scarcely longer than broad, turgid or 

 obcompressed, orbicular-obovate or elliptic-obloug iu outline. Cotyledons incum- 

 bent. Hairs some or all branched (absent in Capsella procumbens). 



16. CAPSELLA. Sepals ovate or oblong, obtuse, thin-margined, spreading slightly or con- 

 siderably or even reflexed in anthesis, not saccate at base. Petals small, spatulate, equalling 

 or little exceeding the calyx. Stamens free and uuappendaged. Style almost none. Fruit 

 capsular, 2-valved, many-seeded, more or less strongly obcompressed ; septum linear to 

 elliptic-oblong, thin and nerveless or nearly so ; valves carinate. 



17. CAMELINA. Sepals short-oblong, obtuse, thin-margined, subequal at base, more or 

 less colored, often villous. Petals spatulate or obovate, unguiculate. Stamens 6, free and 

 uuappendaged. Style slender ; stigma simple. Capsule obovoid, 2-celled, many-seeded, 

 with a broad thin obovate persistent septum and somewhat firm strongly convex valves. 

 Seeds biseriate in the cells, wingless. 



18. NESLIA. Sepals, petals, and .stamens of the preceding. Style slender; stigma simple 

 or emarginate. Fruit globose or subglobose, indehiscent, 2-celled or more commonly, 

 through the obliteration of the fugacious .septum, 1-celled. Seeds 2, or more frequently by 

 abortion 1, neither winged nor margined. 



Tkibe V. CAKILINE^. Fruit transversely 2-jointed ; cells unequal, both 1-seeded 

 (in North American species) and indehiscent. The ovule in the upper cell erect, 

 in the lower pendulous. 



1 9. CAKILE. Sepals short, erect or .slightly spreading, oblong, obscurely saccate at base, 

 somewhat fleshy. Petals exserted. Stamens 6 ; filaments free and unappeudaged. Style 

 none ; stigma simple. Seeds oblong, turgid ; cotyledons accumbent. 



Tribe VT. BRASSICEiE. Fruit elongated, terete or somewhat prismatic, often 

 torose, usually partially or wholly dehiscent by two valves, 2-celled with a longi- 



