CLASS XVI. ORDER V. 275 



divisions mostly pinnatifid. Peduncles long, somewhat hairy, 

 with two terminal flowers. Calyx hairy. Petals rounded, pale 

 purple. The whole plant has a peculiar, strong smell. — Road 

 sides. Maiden. — Flowering most of the summer and autumn. — 

 Annual. 



Geranium dissectum. Willd. Wood Geranium. 



Diffuse, pubescent, leaves opposite, five parted, the 

 lobes three cleft and cut ; peduncles two flowered, 

 elongated ; petals emarginate, as long as the awned 

 calyx ; beak hairy. 



A delicate plant with small flowers. Stem a foot high, pubes- 

 cent. Leaves cut almost to the base into about five segments, 

 these again subdivided and variously cleft. Petioles hairy. Pe- 

 duncles axillary, forked, with four minute linear bractes at the 

 bifurcation. Calyx hairy, awned. Petals short, pale red. Beak 

 hairy, a part of the hairs glandular. On Medford hills, near the 

 Andover turnpike. — June, July. — Annual. 



300. OXALIS. 



OxALis ACETOCELLA. L, Commoji Wood Sorrel. 



Stemless ; scape one flowered, longer than the 

 leaves ; leaves ternate. broad-obcordate with rounded 

 lobes ; styles as long as the inner stamens ; root den- 

 tate. Willd. 



Root dentate, with truncated projections. Petioles semicylin- 

 drical. Peduncles roundish, pubescent, with two opposite, acute 

 bractes. Segments of the calyx oblong, acute. Petals oblong, 

 obliquely imarginate, white, striate, with purple, yellow at base. 

 Stamens alternately long and short. Styles equal to the longer 

 stamens. — Woods. — May, June. — Perennial. 



Not found about Boston, but very abundant in woods from fifty 

 to one hundred miles to the north and west. The American 

 plant has the petals oblong and unequally bilobate, a character 

 which might be considered specific, did not the European plant, 

 as I find from specimens, sometimes present the same figure. 



