--2.

1b. Flowers pale-yellow, with a dark center (2-4 dm. high; late summer)
=Flower-of-an-hour, Hibiscus trionum.=

1c. Flowers white to red or blue, never yellow --3.

2a. Leaves broadly heart-shape (10-15 dm. tall)
=Velvet Leaf, Abutilon theophrasti.=

2b. Leaves ovate-lanceolate (2-5 dm. tall) =Sida, Sida spinosa.=

3a. Calyx subtended by 6 to many bractlets which are sometimes united at
base (summer) --4.

3b. Calyx subtended by 3 bractlets, or by none --6.

4a. Flowers 2-4 cm. wide (5-10 dm. high; flowers pink)
=Marsh Mallow, Althaea officinalis.=

4b. Flowers 7-15 cm. wide (8-15 dm. high; flowers pink to nearly
white) (Rose Mallow) --5.

5a. Leaves densely pubescent below =Rose Mallow, Hibiscus moscheutos.=

5b. Leaves glabrous =Rose Mallow, Hibiscus militaris.=

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 rotundifolia.=

8b. Stems erect (10-15 dm. high; summer)
=Mallow, Malva verticillata.=

9a. Leaves with prominent but shallow lobes; flowers axillary
=Mallow, Malva sylvestris.=

9b. Leaves deeply lobed or cleft; flowers in the upper axils, producing
a raceme-like cluster --10.

10a. Lobes of the leaf dentate or incised =Mallow, Malva alcea.=

10b. Lobes of the leaf pinnately cleft into linear or narrowly
oblong divisions =Mallow, Malva moschata.=

11a. Flowers white (1-2 m. high) =Virginia Mallow, Sida hermaphrodita.=

11b. Flowers purple or pink (3-5 dm. high, spreading)
=Poppy Mallow, Callirhoe triangulata.=

HYPERICACEAE, the St. John's-wort Family

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 (flower