CABBAGE FAMILY 43 



but in damper places continues in flower all the summer. The 

 very small white flowers are soon overtopped by the lengthen- 

 ing pods, the valves of which, when ripe, curl up elastically, 

 scattering the seeds to a considerable distance. — Fl. March — 

 August. Annual. 



4. C. flexubsa (Wavy Bitter Cress). — Almost equally common, 

 differs in having a more wavy and more leafy stem, and usually 

 six stamens and a longer style. — Shady places. — Fl. April — 

 September. Biennial or perennial. 



5. C. impdtiens (Narrow-leaved Bitter Cress). — A stout, erect, 

 glabrous, leafy plant ; leaves with fringed stipule-like auricles ; 

 leaflets narrow ; flowers \ in. across, white. — Moist rocks, chiefly 

 limestone; rare. — Fl. May — August. Annual. 



7. Dentaria (Coral-root). — Perennial herbs with fleshy tooth- 

 like scales on their rhizomes ; flowers large ; sepals erect, equal ; 

 petals clawed ; pods lanceolate, compressed, with elastic valves ; 

 seeds i -seriate ; f tinkle dilated, winged. (Name from the Latin 

 dens, a tooth, from its tooth-like scales.) 



1. D. bulbifera (Bulbiferous Coral-root). — An erect, unbranched 

 plant, with lower leaves pinnate, upper leaves simple, lanceolate, 

 serrate, or entire, easily distinguished from any other British plant 

 in the Order by its rose-coloured cr purple flowers, \ — \ in. across, 

 the white, tooth-like knobs on its rhizome, and the dark purple 

 bulbils in the axils of the upper leaves. — Shady places, chiefly in 

 the south-east of England ; rare. — Fl. April — June. Perennial. 



*8. Hesperis (Dame's Violet). — Erect, stout, leafy plants; 

 leaves simple ; floivers large ; sepals erect, lateral pair gibbous ; 

 petals clawed ; pods long, slender, cylindric, constricted between 

 the seeds. (Name from the Greek hesperos, evening, from its 

 being fragrant in the evening.) 



1.* H. matrondlis (Dame's Violet) is a garden escape, with 

 ovate-lanceolate, serrate, acuminate leaves, and white or lilac 

 flowers, f in. across. — Fl. April — July. Biennial. 



9. Sisymbrium (Hedge-mustard). — Annual or biennial herbs, 

 with unbranched hairs or none ; flowers in lax racemes, generally 

 yellow ; pods narrow, linear. (Name of Greek origin.) 



1. S. Thalidnum (Thale Cress, or Wall Cress). — Stem erect, 

 slender, 6 — 10 in. high, branched; leaves mostly radical, simple, 

 oblong-lanceolate, serrate, pubescent ; flowers minute, white ; pods 

 linear, obscurely four-angled, ascending, twice as long as their 

 stalks. — Common on dry banks and walls. — Fl. April — October. 

 Annual. 



