DECANDRIA— PENTAGYNIA. Oxalis. 323 



segments, than in either of the two preceding. Each leaf oi 

 S. Forsterianum has a dark spot, or pore, at the back, just below 

 the point, as in the uncoloured separate figure of Engl. Bot. But 

 of this there are also traces, even in dried specimens of S. ru- 

 pestre. Mr. Griffith and Mr. Forster are of opinion that the pre- 

 sent is the only one, of these two species, ever found in Wales, 



240. OXALIS. Wood-sorrel. 



Linn.Gen.23\. Juss.270. Fl.BrA9\. La7n.t. 39\. Gartn. tAl3, 

 Oxys. Tourn. 1. 19. 



Nat. Ord. Gruinales. Linn. 14. Akin to Gerania. Juss. 73. 

 Rather to the true Rutacece. Juss. 8 1 . sect. 2. 



Cal. inferior, in 5 deep, acute, permanent segments. Pet. 5, 

 much longer than the calyx, erect, obtuse, rather oblique, 

 connected laterally by their claws; spiral in the bud. 

 Filam. capillary, sometimes combined, erect, the 5 outer- 

 most shortest, and often protuberant at the back or sum- 

 mit. Anth. roundish, furrowed, incumbent. Germ, su- 

 perior, oblong or roundish, with 5 angles. Styles 5, thread- 

 shaped, either longer or shorter than the longest stamens. 

 Stigmas obtuse, downy. Caps, with 5 angles, and 5 cells, 

 membranous, bursting lengthwise at the angles. Seeds 

 roundish, polished, each seated on an elastic tunica in 

 some species solitary, in others several in each cell. 



Herbaceous, acid. Root scaly, or bulbous. Leaves com- 

 pound, mostly ternate. Fl. purplish, white, or yellow, 

 inodorous. 



\. O. Acetosella. Common Wood-sorrel. 



Stalks radical, single-flowered. Leaves ternate, inversely 



heart-shaped, hairy. Root of many scaly joints. Stamens 



all simple. 

 O. Acetosella. Linn. Sp. PI. 620. Willd. v.2.780. FLBr.49l. 



Engl. Bot. vAl.t. 762. Curt. Lond.fasc. 2. ^ 3 1 . Woodv. Med. 



Bot. t. 20. Hook. Scot. 141. Fl. Dan. t. 980. Jacq. Oxal. 1 1 4. 



f. 80. /. 1. Ehrh. PL Off. 1^4. 

 Oxys n. 928. Hall. Hist. v. 1 . 402. 



O. alba. Raii Syn. *281 . Ger. Em. 1201 ./. Merr. Pin. 90. 

 Trifolium acetosum. Dod.Fritment. 214. f. Pempt.57S.f. Matth. 



Valgr. V. 1.191./. Camer. Epit. 584./. 2. Dalech. Hist. 1355./. 

 T. acetosum vulgare. Bauh. Pin. 330. 



/S. T. acetosum vulgare, flore purpureo. Dill, in Raii Syn. *281. 

 In groves and shady places abundantly. 

 Perennial. April, May. 



Root of several parcels of fleshy reddish scales, connected by a 



Y 2 



