8a. Reflexed lobes of corolla merely purple-tinged (1-2 m. high)
=Milkweed, Asclepias syriaca.=

8b. Reflexed lobes of corolla bright-red or purple --9.

9a. The erect hoods of each flower about 5 mm. long (7-12 dm. high)
=Milkweed, Asclepias purpurascens.=

9b. The erect hoods of each flower about 3 mm. long (6-10 dm. high)
=Swamp Milkweed, Asclepias incarnata var. pulchra.=

10a. Leaves broadly rounded and almost sessile at base (flowers
purplish) --11.

10b. Leaves narrowed at the base, distinctly petioled (8-15 dm.
high) --12.

11a. Umbel solitary, terminal and erect on a long peduncle (4-8 dm.
high) =Milkweed, Asclepias amplexicaulis.=

11b. Umbels terminal or lateral, bent toward one side (7-12 dm. high)
=Milkweed, Asclepias sullivantii.=

12a. Corolla (not hoods) red (1-2 m. high)
=Swamp Milkweed, Asclepias incarnata.=

12b. Corolla (not hoods) greenish (8-15 dm. high)
=Milkweed, Asclepias exaltata.=

CONVOLVULACEAE, the Morning Glory Family

Twining or trailing herbs (except one species), with regular flowers;
sepals 5; corolla 5-angled or 5-lobed; stamens 5, attached to the
corolla; ovary superior, 2-3-celled.

1a. Plants with green foliage and conspicuous flowers (summer) --2.

1b. Leafless brown or yellow plants, with very small flowers (Dodder)
--7.

2a. Style divided at the top into linear or oblong stigmas (flowers
white or pink) (Bindweed) --3.

2b. Style not divided at the top; stigmas sessile, capitate
(Morning Glory) --6.

3a. Stem erect; leaves rounded or somewhat cordate at base, not hastate
or sagittate (1-3 dm. high) =Bindweed, Convolvulus spithamaeus.=

3b. Stem trailing or twining; leaves sagittate or hastate --4.

4a. Calyx almost concealed by two large heart-shape bracts --5.

4b. Bracts at base of calyx none =Bindweed, Convolvulus arvensis.=

5a. Leaves triangular-hastate, with sharp basal lobes
=Bindweed, Convolvulus sepium.=

5b. Leaves oblong-ovate, the basal lobes obtuse
=Bindweed, Convolvulus sepium var. pubescens.=

6a. Stem smooth or nearly so; o