n CLASS XV. ORDER ti. 



compressed, torulose, subdivaricate. 39. 63 — tha!- 

 iana^ (wall-cress) radical leaves oblong petioled, 

 cauline leaves lanceolate sessile, stem erect rough- 

 haired at the base, petals twice as long as the calyx. 

 0. Vf.'^tuberosa^ stem simple, leaves obtuse lance- 

 olate toothed, lower leaves sub-petioled, root tuber- 

 ous-fibrous. % . w. — lyrata^ leaves glabrous, radical 

 leaves lyrate, stem leaves linear-lanceolate sub-fal- 

 cate. O* w. — his/iidtty radical leaves liontooth-lyr- 

 ate, stem-leaves lanceolate with forked hairs, stem 

 branchy glabrous. 71. w. — canadensis^ leaves lance- 

 olate toothed glabix)us, or with very soft hairs, w. 

 TuRRiTis. Calyx converging, erect : corol erect: 

 silique very long, angled, striate. 39. 63 — laevigata^ 

 (tower-mustard) leaves glabrous, radical ones obo- 

 vate serrate, cauline ones lance-linear entire clasp- 

 ing. % , w. — hirsuta^ leaves all hispid, cauline ones 

 clasping, silique 4-angled. !!/.w- 



Dentaria. Calyx longitudinally converging; 

 silique bursting elastically v/ith re volute valves : 

 the partition thick and fungus-like : stigma emar- 

 ginate. (Roots always fleshy with tooth-like pro- 

 cesses.) — difihylla^ (tooth-root) stem with two ter- 

 nate leaves nearly opposite and unequally gashed. 

 '^. w-y. — lac'miatas leaves triternate, leafets 3-part- 

 ed linear toothed, racemes terminal many-flowered. 

 %» w-p. 



Hesperis. Calyx closed, shorter than the claws 

 of the petals : petals when bent obliquely, are linear 

 or obovate : silique sub-terete : siigmas forked, with 

 converging apexes. 39. 63 — fiinnafAJida^ (rocket) 

 leaves sharply serrate, upper ones lanceolate, low- 

 ers one pinnatifid, siliques shortish sub-peduncled, 

 %' w — tristisy stem branched bristly spreading, y. 

 c. — matronalis, (dame's violet) stem simple erect, 

 leaves lance-ovate denticulate. %. w. e. 



Erysimum. Calyx closed ; silique columnar, 



