73 



6a. Petals prominently notched at the end or reverse heart- 

 shape (Mallow) 7. 

 6b. Petals obtuse or truncate (summer) 11. 



7a. Flowers 1 1.5 cm. wide 8. 



7b. Flowers 2 5 cm. wide (3 8 dm. high; flowers in summer) 9. 



8a. Stems procumbent, prostrate, or spreading (spring, summer, 

 and autumn) Mallow, Malva rotimdifolia. 



8b. Stems erect (10 15 dm. high; summer) 



Mallow, Malva verticillata. 

 9a. Leaves with prominent but shallow lobes; flowers axillary 



Mallow, MaWa sylvestris. 



9b. Leaves deeply lobed or cleft; flowers in the upper axils, produc- 

 ing a raceme-like cluster 10. 



lOa. Lobes of the leaf dentate or incised Mallow, Malva alcea. 



lOb. Lobes of the leaf pinnately cleft into linear or narrowly 



oblong divisions Mallow, Malva moschata. 



lla. Flowers white (1 2 m. high) 



Virginia Mallow, Sida hermaphrodita. 

 lib. Flowers purple or pink (3 5 dm. high, spreading) 



Poppy Mallow, Callirhoe triang-ulata, 



HYPERICACEAE, the St, John's-wort Family 



Herbs or shrubs, with opposite entire leaves dotted with trans- 

 lucent glands; flowers usually yellow (or pink); sepals and petals 

 each 5; stamens 5 to many; ovary with 3 5 styles. (St. Jolm's-wort.) 



la. Shrubs (4 8 dm. high; flowers yellow, summer) 2. 

 Ib. Herbs (flowers in summer) 3. 



2a. Styles 5 St. John's-wort, Hypericnm kalmiannm. 



2b. Styles 3 St. John's-wort, Hypericnm prolificum. 



3a. Flowers pinkish, 15 mm. broad (3 5 dm. high, in swamps) 



Marsh St. John's-wort, Hypericnm virglnicum. 



3b. Flowers yellow 4. 



4a. Flowers about 4 cm. wide; principal leaves 5 10 cm. long 

 (7 15 dm. tall) St, Jolm's-wort; Hypericum ascyroii. 



4b. Flowers 8 25 mm. wide; stamens 15 or more 5. 

 4c. Flowers 1 10 mm. wide; stamens 12 or fewer (1 6 dm. 

 high) 7. 



5a. Petals dotted with black (48 dm. high) 6. 

 5b. Petals without black dots (2 5 dm. high) 



t. John's-wort, Hypericum ellipticum. 



6a. Flowers 20 25 mm. wide; leaves of an oblong type, broad- 

 est near the middle St, John's-wort, Hypericum perforatum. 

 6b. Flowers 10 15 mm. wide; leaves of an ovate type, broadest 

 below the middle St. John's-wort, Hypericum punctatum. 



