CRUCIFEK^. 101 



12. THLASPI. Sepals short, oval, obtuse, tliin-iimrgiued, erect or KliKhtly sjirea-linf,'. 

 Petals ol)ovate or oblauceolate, entire. Staniciw free, uuappeiifiaged ; anthiTu' Kli.irt, „\iil. 

 Style slender or sometimes none ; stij^ma Hniall, entire or nlightly cmarginate. Capsule 

 orbicular, elliptic-oblong, or oblance«dato ; the valves very stronjjly and UHUally wiiarply 

 keeled, often winged especially toward the ajiex. 



* # Fruit strongly obcomprossed or didymous; cells usually Iseecle.l; cotyledons incum- 

 bent (except iu Lepidium Vin/inicttm) : terrestrial. 



13. LEPIDIUM. Sepals short, ovate or ellii)tic-oblong, t.btu.se. equal at ba- 

 s])rcading. I'etals ol)ovate or oblanccolatc-spatulate, entire, rounded at tlu! a; 



abortive or none. Stamens free, unappondagcd, all six ])re«cnt or by al«jrtii.i. ,.,. 



ones absent, or through further simplification only two stamens present, each repre.stiiiin;: 

 one of tlie longer pairs. Style slender and more or less elongated or Rtigma h^^.■.il^• 

 Capsule orbicular, ovate, or elliptic-oblong, often ntjtched at the apex, regularly debiw .n; ; 

 valves very strongly comjiresscd and sharjily kecKd, oft<;n wing-ajipcndagcd eb|>c(i;illv 

 toward the apex, not thickened nor sculptured. Ovules j)cndulous from near the apex uf 

 the cells. 



14. SENEBIERA. Sepals oval, eijual at base, spreading, often fugacious. I'etals olxnafe, 

 or more or less abortive, short, linear, or subulate. Stamens free and una|ipendag<<l, :ill 

 6 present or only 4 or 2 as in the preceding; anthers short, somewhat didymnus. Stigma 

 sessile, nearly or quite simple. Fruit more or less distinctly didynious; the valves thicki>li, 

 often sculptured or tuberculatcd, falling off as I-seeded closed or nearly closed nutlets. 

 Embryo foliled morphologically above the base of the cotyleilons. 



* * * 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 spatulatp, 

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

 unappendaged ; anthers oval. Stigma sessile, slightly 2-lobcil. Seeds few, 2-rowcd in the 

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

 dons, not between them and the radicle nor in the latter. 



Tribe IV. CAMELINEiE. Fruit short, scarcely longer than broad, turgid or 

 obcompressed, orbicular-obovate or elliptic-oblong in outline. Cotyledons incum- 

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



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

 siderably or even reflexed in anthesis, not saccate at liase. Petals small, spatulate, c<pialiing 

 or little exceeding the calyx. Stamens free and unappendaged. Style almost Jione. Fruit 

 capsidar, 2-valvcd, many-seeded, more or les.s strongly ol)compre.s.sed; septum linear to 

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



17. CAMELINA. Sepals short-oblong, obtuse, thin-margined, subequal at ba.'se, m<irc or 

 less colored, often villous. Petals .spatulate or obovate, unguicnlate. Stamens G, free an«l 

 unappendaged. Style slender ; stigma simple. Capsule obovoid, 2-celled, many-seodod. 

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

 Seeds bi.scriatc in the cells, wingless. 



18. NESLIA. Scpal.s, petals, and stamens of the preceding. Stylo slender; stigma simple 

 or emargiuate. Fruit globose or subglobose, indehiscent, 2-oelle<l or more commonly, 

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

 abortion 1, neither winged nor margined. 



Tkibe V. CAKILINE/E. Fruit transversely 2-jointcd ; cells unequal, both l-s<^ede<l 

 (in North American species) and indehiscent. The ovule in the upj>er cell en^ct, 

 in tlie lower i>endulous. 



19. CAKILE. Sepals .-ihort, erect or slightly spreading, oldong, okm-urtly .-^icratc nt l«iw», 

 somewhat fleshy. Petals exserted. Stamens 6 ; filaments free and unnpjH'ndaged. Style 

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



Tribf VT. RRASSICEiE. Fruit elongated, terete or somewhat pri inatic. often 

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



