7a. Flowers brilliant orange (3 6 dm. high) 



Butterfly Weed, Asclepias tuberosa, 



7b. Flowers red or purple 8. 



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 yar. pulchra. 



lOa. Leaves broadly rounded and almost sessile at base (flow- 

 ers purplish) 11. 



lOb. Leaves narrowed at the base, distinctly petioled (8 15 dm. 

 high) 12. 



lla. Umbel solitary, terminal and erect on a long peduncle (4 8 

 dm. high) Milkweed, Asclepias amplexicaulis. 



lib. Umbels terminal or lateral, bent toward one side (7 12 dm. 

 high) Milkweed, Asclepias sullivantii. 



12a. Corolla (not hoods) red (12 m. high) 



Swamp Milkweed, Asclepias incarnata. 

 12b. Corolla (not hoods) greenish (815 dm. high) 



Milkweed? Asclepias exaltata. 



COIN YOLYULACEAE, the Morning Glory Family 



Twining or trailing herbs (except one species), with regular flow- 

 ers; sepals 5; corolla 5-angled or 5-lobed; stamens 5, attached to 

 the corolla; ovary superior, 2 3-celled. 



la. Plants with green foliage and conspicuous flowers (summer) 2. 

 Ib. Leafless brown or yellow plants, with very small flowers (Dod- 

 der) 7. 



2a. Style divided at the top into linear or oblong stigmas (flow- 

 ers white or pink) (Bindweed) 3. 



2b. Style not divided at the top; stigmas sessile, capitate (Morn- 

 ing 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. 



