18 COMMON CANADIAN WILD PLANTS. 



L5. Nes'Un. Flowers very much as in the last. Pod nearly globular^ 

 hardly one-twelfth of an inch across^ usually only l-eelled and 

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



*- -^-Silicle compressed contrary to the narrow partition. 



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



hoat-shaped, wingless. Seeds numerous. Cotyledons incumbent. 



17. Tlilas'pi. Flowers white. Podobovateoroboordate.toiressd. Seeds 



several. Cotyledons accumbent. 



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



the valves boat-shaped and winged. Seeds solitary, 



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



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

 seeded nutlets. Prostrate diffuse herbs, with a disagi'eeable char- 

 acteristic odour. 



* * * Pod indehiscent, fleshy, jointed. 



20. Cakl'le. Flowers purplish. Pod 2-jointed, fleshy. Leaves fleshy. 



Cotyledons accumbent. 



21. Rapli'aiiiis. Flowers yellow, turning whitish or purplish. Pod 



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

 Cotyledons conduplicate. 



1, NASTrK'TIEM, E. Br. Watee-Ckess. 



1. N. Offleina'le, E. Br. (Wateb-Cebss.) 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 Ckess.) Flowers yellow. 

 Stem erect. Leaves pinnately parted, the lobes out-toothed. 

 Pods ovoid. — Wet places. 



3. N. laeus'tre, Gray. (Lakf, Ceess.) 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'eia, Fries. (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, soon 



