t68 a guide to the WILD FLOWERS 



504. Three-toothed Cinquefoil. SibbaJdiopsis tridentata. 

 (Potentilla tridentata.) An almost woody, prostrate plant of 

 rocky summits, scarcely over 6 in. high. Leaves all basal, 

 compound, with 3 wedge-shaped leaflets that are conspicu- 

 ously 3 (rarely 2 or 5) notched at the tip. Flowers white, 

 about ^ in. wide, in an open terminal cluster. Fruit dry. 

 Greenland to the higher southern Alleghanies, and westward. 

 July. Fig. 504. Related plants are Nos. 361-367. 



505. Violet Wood-sorrel. lonoxalis violacea. (Oxalis vio- 

 lacea,) (Oxalidaceae.) A delicate woods plant with compound, 

 long-stalked leaves, and 3 triangular, shallowly notched leaf- 

 lets, without teeth. Flowers in a sparse cluster, rose-purple, 

 rarely whitish, about }i in. wide, with 5 petals and sepals. 

 Fruit a minutely warty pod. Mass. to Florida, and westward. 

 May. Fig. 505. Related plants are Nos. 371-373. 



506. White Wood-sorrel. Oxalis Acetosella. {Oxalidaceae.) 

 Resembling No. 505, but with white or pink solitary flowers 

 that are veined deep pink. It also bears inconspicuous flowers 

 near the ground that never open. In cold moist woods. Nova 

 Scotia southward, mostly in the mountains, to No. Carolina ; 

 north shore of Lake Superior. Also in Europe, Asia and 

 northern Africa. June. See also Nos. 371-373. 



507. Flowering stalks (or the plant) 10 in. high or more. 

 Flower solitary, 2 in. wide ; leaves deeply divided 



May Apple no. 508 



Flowers less than Yi in. wide, in clusters ; leaves shallowly lobed 



Flowers greenish, petals very small Alum-root no. 509 



Flowers white, petals conspicuously fringed 



Bishop's-cap no. 510 



508. May Apple. Podophyllum peltatiim. (Bcrbcrida-ceae.) 

 A poisonous-rooted, smooth perennial, with large deeply di- 

 vided leaves, and a solitary, stalked white flower 2 in. wide. 

 Leaves nearly i ft. in diameter, basal, or i or 2 on the stem, 

 roundish in outline, and 5-9 lobed. Petals 6-9, waxy. Fruit 

 edible, fleshy, yellow, about 2 in. long. In woods. Quebec 

 and Ontario to Florida, and westward. May. Fig. 508, See 

 also Nos. 344 and 501. 



