18 COMMON CANADIAN WILD PLANTS, 



15. Nes'lla. Flowers very much as in the last. Pod nearly globular^ 



hardly one-twelfth of an inch across, usually only 1-celled and 

 1-seeded, wrinkled, tipped with the slender style. 



■>- -t-Silicle compressed contrary to tlie narrow partition. 



16. Capscl'ln. Flowers white. Pod obcordate-triangular ; valves 



hoat-shaped, wJJnfl'Jes.s. Seeds numerous. Cotyledons incumbent. 



17. Thias'pi. Flowerswhite. Pod obovate or obcordate, wsn.ved. Seeds 



several. Cotyledons accumhent, 



18. liepld'lum. Flowers white or whitish. Pod roundish, very flat ; 

 ( the valves boat-shaped and winged. Seeds solitary. 



19. Sencblc'ra. Flowers greenish-white, very small. Pod 2seeded, 



the valves wrinkled and separating at maturity as 2 closed one- 

 seeded nutlets. Prostrate diftuse herbs, with a disagreeable char- 

 acteristic odour. 



* * * Pod iTidehiscent, fleshy, jointed. 



20. €aki'lc. Flowers purplish. Pod 2-jointed, fleshy. Leaves fleshy. 



Cotyledons accumhent. 



21. KapU'auiis. Flowers yellow, turning whitish or purplish. Pod 



elongated, several-seeded, mostly constricted between the seeds. 

 Cotyledons conduplicate. 



1, NASTIJB'TniM, R. Br. Watek-Crkss. 



1. N. offleina'le, E. Br. (Watbk-Cbkss.) Flowers white. 

 Stem spreading and rooting. Leaves pinnate ; leaflets 3-11, 

 roundish or oblong, nearly entire. Pods oblong-linear. — 

 Ditches and streamlets. 



2. N. palUS'tre, DC (Marsh Cress.) Flowers yellow. 

 Stem erect. Leaves piunately parted, the lobes cut-toothed. 

 Pods ovoid. — Wet places. 



3. N. laeus'tre. Gray. (Lake Ckess.) Flowers white. 

 An aquatic plant, with the submerged leaves finely dissected ; 

 the leaves out of the water oblong, and either entire, serrate, 

 or pinnatifid. Pods ovoid, 1-oelled. 



4. N. Armora'cia, Pries. (Horseradish.) Has escaped 

 from gardens in many places. Flowers white. Eoot-leaves 

 very large, oblong, and generally . crenate ; stem-leaves 

 lanceolate. Pods globular. Eoots very large. 



5. N. traehyear'pum, Gray. Flowers white. Stem 

 nearly glabrous, erect, branching. Leaves lyrate-pin- 

 natifid. Pods oblong-linear, somewhat roughened, sooij 



