30 CRUCIFERJE. [SISYMBRIUM. 



leafy. Leaves 2-4 in., finely divided ; lobes spreading. Flowers f in. diam. 

 Pods 1 in., in long racemes ; valves beaded, 3-ribbed ; style very short. 

 DISTRIB. Europe (Arctic), N. Africa, W. Asia to Himalaya, N. and S. 

 America. 



4. S. officina'le, Scop. ; leaves runcinate-toothed or -lobed hairy, flowers 

 yellow, pods in a leafless raceme subulate terete ap^ressed to the stem. 

 Hedge-musta/rd. 



Hedgebanks and waste places from Orkney southd. ; Ireland ; Channel Islas., 

 fl. June- July. Stem 1-2 ft., terete, erect, with spreading or reflexed hairs ; 

 branches horizontal. Leaves variously cut or lobed, with a tendency to a 

 large terminal lobe. Flowers T\T in. diam., homogamous. Pods \ in., 

 tapered from the base into the almost pungent style ; pedicel short, thick. 

 DISTRIB. Europe, "W. Asia to the Himalaya, N. Africa ; introd. in the 

 U. States. 



5. S. Allia'ria, Scop. ; leaves all petioled deltoid or reniform-cordate 

 coarsely toothed or creiiate hairy beneath, pods stout long 4-angled, pedicels 

 short stout. Erysimum t L. ; Alliariaofficinalis, Andiz. Garlic- mustard, 

 Sauce alone. Jack by the hedge. 



Hedgebanks, &c., from Ross southd. ; ascends to near 1,000 ft. in England ; 

 rarer in Scotland and Ireland ; Channel Islds. ; fl. May- June. Annual or 

 rarely biennial, glabrous or with a few scattered simple hairs, rank scented. 

 Stem 2-3 ft., decumbent at the base, then flexuous, erect, simple or sparingly 

 branched. Radical leaves often 3 in, diam,, with long slender petioles, 

 smaUer and more reniform than the cauline, which are cuneate at the base. 

 Flowersbin.diaxn., white ; homogamous. Pods 2| in., linear, slightly curved, 

 rigid, subacute ; valves keeled ; style very short, stigma truncate ; seeds 

 oblong. DLSTRIB. Europe, N. Africa, temp, and W. Asia to the Himalaya. 



S. POLYCERA'TIUM, L. ; prostrate, leaves runcinate-pinuatifid glabrous, 

 flowers yellow, pods 1-3 in the axils of leafy bracts cyliudiic curved 

 spreading. 



Koadside paths, Bury St. Edmunds, introduced by Dr. Goodenough ; ballast- 

 heaps, Fife; fl. July-Aug. Annual, glabrous, very leafy. Leaves often 

 reduced to the large triangular coarsely toothed terminal lobe. Flower 

 smal 1 , yellow. Pods f in., in short leafy racemes, broad at the base, on very 

 short thick pedicels; valves 3-nerved, very convex, beaded, obtuse ; style 

 evident, short, thick, stigma obtuse. DISTRIB. Mediterranean to the 

 Caucasus. 



8. ERYS'IMUM, L. TREACLE-MUSTARD. 



Annual biennial or peremiial hoary herbs ; hairs appressed, forked. 

 Leaves narrow, entire. Flowers yellow, often fragrant. Sepals erect, 

 equal or the lateral gibbous at the base. Petals clawed. Pods narrow, 

 compressed, 4-angled or terete ; valves linear, often keeled ; rcpluni 

 usually prominent ; septum membranous or corky ; stigma 2-lobed or 

 entire. Seeds many, 1 -seriate, oblong, not winged or winged at the tip ; 

 radicle incumbent. DISTRIB. Temp, and cold N. hemisphere ; species 

 about 70. ETYM. e'pt-co, to draw blisters. Xear Sisymbrium, but cauline 



