BOTANY OF LA SALLE COUNTY. 103 



fifth in. broad, Pi. Ju. J. Stem often red. 

 Spreads by roots. Often called Wandering- 

 Milkweed. Cult, fields. 



A. cannabinum. Branches upright, flowers G. W. 

 small. In woods and by streams. 



Order 67. ASCLEPIADA CEAE. Milkweeds. 

 Si Ik weed. 



Juice milky, flowers in umbels; fruit a pod. 

 Seeds with a cottony plume. 



ASCLE PIAS. P. Milkweed. Leaves large, oppo- 

 site, thick. 



A. tuberosa. Butterfly-weed. Pleurisy Root. Erect, 

 hairy, leafy; leaves long, lanceolate, dark G. 

 flowers Or. Y. R. in large umbels. Jn. Prairies. 

 A beautiful plant. Juice not milky. 



A. purpurascens. P. Milkweed. Leaves elliptical, 

 downy below, petiole short; flowers P. 1 to 3 ft. 

 Prairies. 



A. incarnata. Smooth; juice scarcely milky; very 

 leafy; leaves oblong-lanceolate, acute; flowers 

 Rs. P. 2 to 3 ft. Swamps. 



A. cornuti. Common Milkweed. Leaves oval- 

 oblong, 4 to 8 in. long, soft-woolly, palish G., 

 stiff; flowers in larg-e clusters, dull P.; pods 

 warty, 3 to 4 in. long. 



Jh. A. Sullivantii. Smooth, tall; leaves ovate-oblong 

 cordate, nearly sessile, flowers P.; pod smooth. 

 Damp lands. 



A. obtusifolia. Leaves cordate, clasping, oblong, 

 very obtuse, sessile; flowers in 1 umbel, G. P.; 

 peduncle long. 2 to 3 ft. Sandy lands. 



A. Meadii. Slender. 1 to 2 ft,; leaves oblong- 

 ovate, obtuse, \ l /2 to 2/4 in. long; flowers G. W. 

 in a solitary umbel. 



A. phytolaccoides. Poke milkweed. Leaves broad- 



