ONAGRACE^ 121 



(PI. 45) ; flowers small, few, leaves nearly sessile, lanceo- 

 late, obtuse, with a few teeth ; damp ; alpine, frequent. 



2. ClRC^A, L. 



Flowers small, white ; calyx bidentate, reflexed ; petals 

 and stamens 2 each ; stigma 2-lobed ; leaves opposite. 



The three British species of Enchanter's Nightshade — 

 C. Lutetiana, L., with ovate nearly entire leaves ; C. 

 alpina^ L., a smaller, more glabrous plant, the leaves 

 more cordate at the base and distinctly toothed ; and C. 

 intermedia, Ehrh., intermediate between these — are met 

 with, the first generally distributed, the two latter in 

 more alpine situations ; all sylvan plants. 



3. ISNARDIA, L. 



Flowers solitary, axillary; calyx-teeth, petals, and 

 stamens 4 each ; seed-vessel an obovate 4-valved capsule ; 

 seeds not crested. Not alpine. 



I. palustris, L. (Ludwigia palustris, Ell.) ; a small gla- 

 brous marsh-plant, petals minute, red, or o, leaves op- 

 posite, ovate, acute, entire, plant often tinged with red ; 

 local. 



4. Trapa, L. 



Flowers solitary, axillary; calyx-teeth, petals, and 

 stamens 4 each ; calyx with 4 persistent lobes ; fruit a 

 woody nearly globular spiny nut. Not alpine. 



T. natanSy L., Water-Nut ; a submerged water-plant ; 

 floating leaves rhomboidal, unequally dentate, submerged 

 leaves pinnatifid with capillary segments, flowers small, 

 white, fruit a woody nut with 2 or 4 prominent conical 



