136 TETRADYNAMIA SILIOUOSA. [CI. 15. 



Wet pi. ; rare. If. 4, 5. Root toothed. FL white ; anth. viol. ; style 

 elong. 



333. NASTURTIUM. Cress. 



1. N. officinale, Sisymbrium Nasturtium, 12. 855. (Water C.) 



Leaves pinnate ; leaflets roundish-heart-shaped, wavy. 

 Clear riv. & ponds. If. G, 7. Stems spread. Fl. white. Pod slender. 



2. N. sylvestre, S. sylv. 33. 2324. (Creeping- Yellow C.) Leaves pin- 



nate ; leaflets lanceolate, deeply serrated or cut. Root creeping. 

 Wet gravelly mead. If . 6 — 9. Root widely creep. Fl. bright yell. 



3. N. terrestre, S. terr. 25. 1747. (Annual Yellow C.) Leaves pin- 



natifid, unequally toothed. Root tapering. Petals scarcely so 

 long as the calyx. Pod curved. 

 Banks and mead. 0. 6 — 9. Root simple. FL small, yellow. 



4. N. amphibium, S. amph. 26. 1840. (Amphibious Yellow C.) 



Leaves oblong, pinnatifid, or serrated. Roots fibrous. Petals 

 longer than the calyx. Pod elliptical. 

 Rivers and ditches. If. 6 — 8. Stem trailing. Fl. yellow; style elong. 



334. SISYMBRIUM. Hedge-Mustard. 



1. S. officinale, Erysimum off. 11. 735. (Common H.) Pods pressed 



close to the main stalk, awl-shaped, downy. Leaves runcinate, 

 hairy. Stem rough with reflexed bristles. 

 Waste gr. ©. 7. Stems 2f. spreading. FL small, pale yellow. 



2. S. 'Irio, 23. 1631. (Broad H. London Rocket.) Leaves runcinate, 



toothed, smooth as well as the stem. Pods erect. 

 Waste gr. and walls. 0. 7, 8. Quite smooth. FL small, yellow. 



3. S. Sophia, 14. 963. (Fine-leaved H.) Leaves doubly pinnatifid, 



a little hairy. Petals smaller than the calyx. 

 Waste gr. 0.7. L. with narrow segments. Fl. minute, yellow. 



335. BARB A RE A. Winter-cress. 



1. B. vulgaris, Erysimum Barb. 7. 443. (Yellow Rocket.) Lower 



leaves lyrate, the terminal lobe roundish; upper obovate, toothed. 

 Marshes and waste gr. If. 5 — 8. Smooth, shining, bitter. Fl. yellow. 



2. B. prcecox, E. prsecox, 16. 1129. (Early W.) Lower leaves lyrate; 



upper deeply pinnatifid, with linear-oblong, entire segments. 

 Watery pi. rare. $ . 4—10. Smooth, H — 2/ hot. Fl pale yellow. 



336. ERYSIMUM. Treacle-mustard. 



1. E. cheiranthoides, 14. 942. (Worm-seed T.) Leaves lanceolate, 



obscurely toothed. Pods erect, on horizontal stalks. Stigma 

 almost sessile. 

 Fields, and osier-holts. 0. 7. Roughish, with close, forked bristles. 

 Fl. golden. 



2. E. Alliaria, 12. 796. (Garlick T. Sauce-alone.) Leaves heart- 



shaped, broadly toothed, stalked. 

 Shady pi. If. . 5. Smooth, with a scent of garlick. FL white. 





