194 UNIVERSITY OF MISSOURI STUDIES [342 



Family 90. ASCLEPIADACEAE. Milkweed family. 



347. ACERATES Ell. Green milkweed. 



814. A. viridiflora (Raf.) Eaton. Common green milkweed. 

 Occasional in the plains about Boulder, 5100-6000 ft. (Dan- 

 iels, 405). 



Massachusetts to Montana; Florida to New Mexico. 



815. A. angustifolia (Nutt.) Dec. [Asdepias stenophylla 

 Gray]. Narrow-leaved green milkweed. 



Common in the plains about Boulder, 5100-6000 ft. (Dan- 

 iels, 298). 



South Dakota to Colorado; Missouri to Texas and New 

 Mexico. 



348. ASCLEPIAS L. Milkweed. 



816. A. speciosa Torr. Showy milkweed. 



Frequent in the plains about Boulder, 5100-6000 ft. (Dan- 

 iels, 262). 



Manitoba to British Columbia ; New Mexico to Califor- 

 nia. 



817. A. brachystephana Engelm. Short-crowned milkweed. 

 Rare on the plains about Boulder, 5100-6000 ft. (Daniels, 



404). 



Wyoming to Texas and Arizona. 



818. A. ineamata L. Swamp milkweed. 



In swales and along streams in the plains, 5100-6000 ft. 

 (Daniels, 671). 

 New Brunswick to Manitoba; Florida to New Mexico. 



819. A. pumila (Gray) Vail [A. verticillata pimiila Gray]. 

 Dwarf milkweed. 



Local in the plains about Boulder, 5100-6000 ft. (Daniels, 

 386). 



South Dakota to Montana; Arkansas to New Mexico. 



