Herbs or shrubs, with opposite entire leaves dotted with translucent glands; flowers usually yellow (or pink); sepals and petals each 5; stamens 5 to many; ovary with 3-5 styles. (St. John's-wort.) 1a. Shrubs (4-8 dm. high; flowers yellow, summer) --2. 1b. Herbs (flowers in summer) --3. 2a. Styles 5 =St. John's-wort, Hypericum kalmianum.= 2b. Styles 3 =St. John's-wort, Hypericum prolificum.= 3a. Flowers pinkish, 15 mm. broad (3-5 dm. high, in swamps) =Marsh St. John's-wort, Hypericum virginicum.= 3b. Flowers yellow --4. 4a. Flowers about 4 cm. wide; principal leaves 5-10 cm. long (7-15 dm. tall) =St. John's-wort, Hypericum ascyron.= 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 (4-8 dm. high) --6. 5b. Petals without black dots (2-5 dm. high) =St. John's-wort, Hypericum ellipticum.= 6a. Flowers 20-25 mm. wide; leaves of an oblong type, broadest 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.= 7a. Leaves minute, subulate, 1-3 mm. long =Pineweed, Hypericum gentianoides.= 7b. Leaves linear, with 1-3 principal veins, broadest near or above the middle =St. John's-wort, Hypericum canadense.= 7c. Leaves lanceolate, 4-6 times as long as broad, with 5-7 principal veins =St. John's-wort, Hypericum majus.= 7d. Leaves oblong, elliptic, or ovate, 1.5-3 times as long as broad --8. 8a. Uppermost bracts linear =St. John's-wort, Hypericum mutilum.= 8b. Uppermost bracts resembling the leaves in shape, but smaller =St. John's-wort, Hypericum boreale.= ELATINACEAE, the Waterwort Family Small marsh herbs, with opposite leaves without translucent dots, and inconspicuous axillary flowers. (Stems 2-5 cm. long; flowers in summer.) One species in Michigan =Waterwort, Elatine americana.= CISTACEAE, the Rock-rose Family Small herbs or shrubs, with opposite or alternate entire leaves; flowers regular, with 5 sepals, 3 or 5 petals, and 3 to many stamens. 1a. Flowers yellow (early summer) --2. 1b. Flowers greenish or purplish, minute, in panicles (late summer) (Pinweed) --4. 2a. Leaves crowded, closely appressed to the branches; flowers 7 mm. wide (2-4 dm. high) =False Heather, Hudsonia tomentosa.= 2b. Leaves spreading; flowers 15-30 mm. wide (3-6 dm. high) (Frostweed) --3. 3a. Petal-bearing flowers solitary =Frostweed, Helianthemum canadense.=