CLASS XV. ORDER II. 7^ 



by valves, caducous ; 2 or 4-celled, wrinkled. 39. 

 63 — edentula^ (sea rocket) leaves obovate sinuate, 

 silicic with 2 smooth one-seeded toothless joints. 

 0. Bigelow. 



B. Silicle ivith a notch tit the end, 



Alyssum. Filaments of the two shorter stamens 

 marked with a tooth : silicle emarginate, often 

 hairy. 39. 6%—^sativum^ (madwort) leaves clasping^ 

 flowers corymbed. 0. y. 



CocHLEARiA. Siiiclc thick, rugosc, many-sccd- 

 ed, 2-valved ; the valves gibbous obtuse. 39. 63— 

 officinalis^ {sz\jLT\y grass) root-leaves round-cordate 

 petioled, stem-leaves sessile oblong. % . w.- — armo- 

 raciUi (horse-radish) root-leaves lanceolate, crenate. 

 ^. w. e. 



Lepidium. Calyx spreading : corol regular ; 

 silicle emarginate, cordate, many-seeded : valves 

 carinate, partition contrary. 39. 63 — sativtun^ (pep- 

 per-grass) leaves oblong, many-cleft, glabrous. 0. 

 w. e . — virginicumj leaves below pinnatifid, above 

 serrate. 11 . w. 



Thlaspt. Calyx spreading : silicle emarginate, 

 obcordate, many-seeded ; valves resemble two 

 boats with the keels outward. 39. 63— -bursa-pasto- 

 riSf (shepherd's-purse) silicle wedge-obcordate,. 

 root- leaves pinnatifid. 0. \v. — ca7n/iesire, (mithri- 

 date mustard) silicle roundish-cordate, leaves ar- 

 row-form. 0. w. 



Order II. SiLiquosA.f 



A. Calyx leaves converging or closed ufion the 



corolSf ivhen the fcowers are mature. 



Arabis. Glands 4, one within each jeafet of the 

 calyx, of the size of the reflected scale : silique 



f Plants of this order resemble each other so nearly, that 

 long descriptions are necessary. 



