!():> c'KUciFEu.i:. 



tudinal merubranous or spongy dissepiment, less Irciiiicntly unicellular or divided 

 transversely by spongy false partitions, thus becoming inuUici'Iluhir and indehis- 

 cent (Raphamis). Seeds uniseriate or biseriate ; cotyledons couduplicate. Petals 

 Avell developed. Pubescence, when present, usually hirsute. Hairs simple. 

 * Fruit stout, imlehisceut, comniouly more or less inonilil'urni, uiiiccllulai- or transversely 

 divided by several false partitious. 



20. RAPHANUS. Sepals erect; the lateral somewhat saccate. Petals large, uiiguiculate, 

 white or pale yellow, less commouly purplish. Stamens 6, uuappeudaged. Fruit attenuate 

 to a slender or rather stout beak. Seeds globular, pendulous. 



* * Fruit more slender, longitudinally 2-celled, and more or less completely dehiscent. 



21. BRASSICA. Sepals erect or spreading, glabrous, equal at the l)ase or one pair some- 

 what saccate. Petals large, unguiculate, light yellow or white, often with purjile markings. 

 Stamens 6, fret; and unappeudaged. Pod terete or nearly so, tipped with a slender conical 

 or somewhat flattened empty or 1-seeded often indehiscent beak. Seeds glolw.se, uniseriate 

 or rarely and indistinctly biseriate iu the cells. 



22. DIPLOTAXIS. Sepals erect or spreading, often pilose. I'etals and stamens of the 

 preceding. Cajisules slendei-, subterete or angled, borne upou slender spreading pedicels; 

 valves rather flat, 1-ncrved; beak conical, sometimes very short. Seeds ovoid or oblong, 

 distinctly biseriate in the cells. 



TiUBK VII. SISYMBKIE.l:^. Stigma when lobed elongated over the placentte (ex- 

 cept in Gregt/ia). Fruit longitudinally 2-celled (very rarely 1-celled), from elliptic- 

 or lance-oblong to linear, always considerably longer than broad. Seeds numerous ; 

 cotyledons incumbent (very oblique or accund)ent in some species of Eri/simiun). 

 A tribe of difticult limitation. 



* Hairs of stem simple, stellately branched or none, not regularly bifid. 

 -1— Stigma entire, or with short lobes spreading over the placentse. 

 ++ Capsule 2-valved, terete, prismatic, or compressed parallel to the perfect or liroad and 



fenestrate septum. 

 = Leaves elliptical, sessile and clasping by a cordate base: pods long, of firm texture, 

 angled ; stuut glabrous annual with habit of a Brasslca : introduced. 



23. CONRINGIA. Sepals and petals rather h)ng and narrow. Valves of the ea])sule 

 l-.3-nerve(l. Style short; stigma (pute simple or more or less distinctly ^-luheil. Seeds 

 l-rowed in the cells, oblong, thick, not margined. Leaves entire. 



= = Leaves siiborl.iiular or reniform, broadly cordate, petiolate, toothed: ])nbescence 

 siniidc or none : jiods elongated, angled : introduced biennial with foliage of a Cn-damine 

 and fruit suggesting that of Burburca. 



24. ALLIARIA. Se])als oval, obtuse, caducous. Petals obovate. Stamens fi, free and 

 una])pendaged. Pod many-seeded, often tornlose; valves keeled, more or less distinctly 

 3-nerved. Style short or none; stigma simple. 



== = == Leaves various, not cordate, except in one or two species of Sisi/mhrium. 

 a. Septum of the capsule usually narrowly or broadly nerved, when jierveless having its 

 cells elongated longitudinally and usually rather thin-walled. 



25. EUTREMA. Sepals short, ovate, ronnd.'d at apex, eipial at base. Petals exserted, 

 entire, obovate, short-clawed. Stamens (J, free and unappeudaged ; anthers short, ovate. 

 Style short or almost none ; stigma small, simple. Fruit oblong-lanceolate to linear, some- 

 what flattened parallel to the septum, narrowed at each end ; valves 1 -nerved and somewhat 

 keeled. Sei)tum entire or very incomplete or almost wanting. Pubescence simple or uone. 

 Leaves entire or nearly so. 



26. SMELOWSKIA. Sepals oblong, snl)e(iual, somewhat spreading." Petals entire, obo- 

 vate or spatulate, exserted. Stamens 6, unappeudaged ; anthers oblong, slij,ditly sagittate at 

 base. Pods lanceolate to lance-oblong, more or less obcompressed ; valves sharply keeled. 

 Stigma sessile. Leaves deeply i)innatifiil. Hairs in part or all branched. 



