30 CRUCIFER^E. [Sisymbrium. 



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

 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. officinale, Scop. ; leaves rimcinate-toothed or -lobed hairy, flowers 

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

 Hedge-mustard. 



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

 fl. June-July. — Stem 1-2 ft., terete, erect, with spi'eading or reflexed hairs ; 

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

 large terminal lobe. Flowers A 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 crenate hairy beneath-, pods stout long 4-angled, pedicels 

 short stout. Erysimum, L. ; Alliaria officinalis, Andrz. 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, 

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

 Flowers J in. diam., white ; homogamous. Pods 2J in., linear, slightly curved, 

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

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



S. polycera'tium, L. ; prostrate, leaves runcinate-pinnatifid glabrous, 

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

 spreading. 



Boadside 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* 

 small, yellow. Pods § 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. ERYSIMUM, L. TREACLE-MUSTARD. 



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

 leaves narrow, entire. Flotvers 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 ; replum 

 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. ipua, to draw blisters. — Near Sisymbrium, but cauline 



