70 VIII. CRUCIFER2E (oLIVEIl). [Thlaspi. 



tire or toothed, tufted ; cauline oblong, auricled at the base. Flowers small 

 in ebracteate racemes, white rose or pale purple. 



A genus of temperate and Arctic countries, chiefly of the northern hemisphere. 



Siliculcs compressed, obovate-rotuudate, deeply notched 1- *• arvense. 



Silicules turgid, elliptical, scarcely notched *. l.sp.nova- 



1. T. arvense, Linn. ; DC. Syst. Veg. ii. 375. An erect, simple or 

 branched, glabrous herb. Radical leaves usually withered at time of flower- 

 ing; cauline oblong, dentate or entire, obtuse or rather acute, amplexicaul. 

 Silicules much compressed, obovate-rotundate, deeply notched, broadh 

 winged, \-\ in. long and nearly as broad. 



Nile Land. Abyssinia {Schweinf. et Asch. Enitm.). 

 A weed of cultivation, widely spread in northern countries. 



2. T. sp. nova ? A low, tufted, glabrous or nearly glabrous herb, 2 

 or 3 in. high or the stems elongate, 6 in. or more, very thinly pilose below. 

 Leaves rather fleshy, glabrous, oblanceolate or oblong ; the upper sessile, 

 obtuse, auriculate and minutely toothed or entire. Racemes short, ebrac- 

 teate, sometimes scarcely exceeding the leaves. Silicules turgid, oblong- 

 ellipsoidal or obovate-ellipsoidal, rather obtuse, scarcely or not at all emargi- 

 nate, equalling or exceeding the patent pedicels ; valves convex, carinate. 



Nile Land. Abyssinia, Schimper ! 



17. SENEBIERA, DC. ; Benth. et Hook. f. Gen. PI. i. 87. 



Sepals short, spreading. Siliqua minute, 2-lobed, more or les3 lateral!} 

 compressed ; valves rough or crested, roundish, separating when ripe as two 

 closed, indehiscent, 1-seeded cocci. Embryo curved, with narrow cotyledon* 

 or radicle incumbent. — Low diffuse herbs. Leaves piunatifid or entire. 

 Racemes usually short, leaf-opposed or apparently axillary. 



A small, widely dispersed, weed-like genus. 



Leaves entire or pinnatisect. Silicules nearly or quite entire (not 



emarginate) at the apex \. S. nilotica- 



Leaves entire or minutely toothed. Silicules more or less deeply 



emarginate at the apex, distinctly didymous 2. 5. integrifoha- 



1. S. nilotica, DC. Syst. Veg. ii. 527. An erect, diffuse or sometime? 

 decumbent, branching, glabrous or nearly glabrous herb. Radical leaves 

 linear-lanceolate or oblanceolate, pinnatisect, toothed or nearly entire. Caulin'' 

 entire, linear or oblong or pinnately toothed. Racemes lateral and terminal, 

 often very short, of numerous very small white flowers. Silicules more or 

 less cordate-reniform ; apex nearly or quite entire (not emarginate), more or 

 less wrinkled, on slender short pedicels. — Cotyliscns niloticus, Desv. Journ." 1 - 

 164, 175. 



Nile Land. J5anl<s of the Nile, various localities south of the tropic of Cancer, Spet't 

 and Grant .' Bromfield I Petherick ! etc. 



2. S. integrifolia, DC. Syst. Veg. ii. 522. A glabrous, erect or de- 

 cumbent, much-branched annual. Leaves linear acute or rather obtuse, 



