28 CRUCIFERjE. [ 



the cauline, which are cuneate at the base. Flowers \ in. diam. Pods 2J in., 

 linear, slightly curved, rigid, subacute ; valves keeled, style very short, 

 stigma truncate. Seeds oblong ; funicle dilated. DiSTHlB. Europe, N. Africa, 

 temp, and W. Asia to the Himalaya. 



S. POI/YCERA'TIUM, L. ; prostrate, leaves runcinate-pinnatifid glabrous, 

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

 spreading. 



Roadside paths near Bury St. Edmunds, where introduced by Dr. Goodenough ; 

 fl. July-Aug. Annual, glabrous, very leafy. Leaves often reduced to the 

 large triangular coarsely toothed terminal lobe. Flowers small, yellow. 

 Pods 4 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. S. of France and Mediterranean to 

 the Caucasus. 



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



Annual biennial or perennial hoary herbs, hairs appressed forked. 

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

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

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

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

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

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

 about 70. ETYM. lpv<a, to draw blisters. Near Sisymbrium, but cauline 

 leaves never auricled, ami hairs 2-3-partite ; differs from Cheiranlhux in 

 the cotyledons, and generally in the stigma. 



1. E. cheiranthoides, L. ; leaves lanceolate, pods short suberect. 

 Waste places in the S. of England ; rarer in the N. and in Ireland ; a colonist, 

 Watson ; fl. June- Aug. Annual. Stem 1-2 ft., erect, leafy, rigid, terete. 

 Leaves 3-4 in., subsessile, lanceolate or oblong-lanceolate, acute, narrowed 

 at the base, obscurely toothed. Flowers ^in. diam. Pods 1 in., straight ; 

 pedicels spreading ; valves strongly keeled, acute ; style very short, stout, 

 stigma truncate; seeds oblong, smooth, very strong-tasted. DISTKIB. 

 Europe (Arctic), N. Africa, N. Asia, N. America. 



8*. HES'PERIS, L. DAME'S VIOLET. 



Erect, biennial or perennial herbs. Leaves alternate, entire. Fl>n-rrx 

 large, handsome. Sepals erect, lateral gibbous at the base. Petals clawed. 

 Pod elongate, terete or 4-angled ; valves Hattish, keeled, 3-nerved; septum 

 membranous ; stigmatic lobes suberect. Seeds many, margined or not ; 

 cotyledons incumbent. DISTRIB. Europe and temp. Asia ; species 20. 

 ETYM. (<nrpos, from some species being odorous in the evening. Very near 

 Matthwla and CIteiranthus, differing chiefly in the stigmas and cotyledons. 



H. MATRONA'LIS, L. ; leaves oblong-lanceolate acuminate. 

 Meadows, plantations, &c., an escape, not even naturalized ; fl. May-July. 

 Pubescent with simple or branched hairs. Rot perennial. Stem* 2-3 ft. 

 few or solitary, erect, stout, leafy. Leaves 2-5 in., shortly petioled or 

 sessile, finely irregularly toothed or serrate. Flowers % in. diam., white or 

 lilac, odorous in the evening ; pedicels in. , spreading. Pods 2-4 in., slender, 

 cylindric, contracted here and there between the remote seeds; pedicels 



