ASCLEPIADACEAE 251 



Leaves in i or 2 whorls of 4's : corolla pink. 10. A. quadrifolia. 

 b. Plants more or less pubescent, the lower surface of the leaves, at least, 

 copiously pubescent. 11. A. Syriaca. 



B. L,eaf -blades linear. 12. A. verticillata. 



1. Asclepias tuberosa L. Bu'TTERFLY-weed. Pi,eurisy-rooT. 

 (Man. p. 741; I. V. f. 2goo.) In dry fields, Me. and Ont. to Minn., 

 Fla., Tex. and Ariz. — Pennsylvania Northampton ; Bucks ; PhiIvA- 

 DELPHiA ; Dei^aware ; Lancaster ; Frankwn ; Huntingdon ; Ai,i,e- 



GHENY. 



2. Asclepias decumbens L. Decumbent Butterfly-weed. (Man. 

 p. 741 ; L F. /. 2goi.) In dry fields, Conn, to 111., N. C. and Fla. — Penn- 

 sylvania : Northampton ; Lancaster ; Franklin. 



. 3. Asclepias rubra L. Red Milkweed. (Man. p. 742 ; I. F. /. 

 2goj.) Moist soil, N. J. and Pa. to Fla., La. and Tex. — Pennsylvania : 

 Bucks ; Montgomery ; Delaware ; Chester ; Lancaster. 



4. Asclepias purpurascens L- Purple Milkweed. (Man. p. 742; 

 I. F. f. 2go4.) In dry fields and thickets, Mass. to Va., Ont., Minn, and 

 K.a.ns. ^ Pennsylvania : Monroe; Bucks; Delaware; Chester; 

 Franklin ; Huntingdon. 



5. Asclepias incarnata L. Swamp Milkweed. (Man. p. 742 ; I. F. 

 /. 2905.) In swamps, N. B. to the N. W. Terr., Tenn., La. and Kans. — 

 Pennsylvania : Northampton ; Bucks ; Delaware ; Chester ; Frank- 

 lin ; Huntingdon ; Lebanon ; Erie ; Allegheny. 



6. Asclepias pulchra Ehrh. Hairy Milkweed. (Man. p. 742 ; I. 

 V.f.'2go6. ) In moist fields and swamps, Me. to Minn, and Ga. — Pennsyl- 

 vania : Northampton ; Lancaster ; Chester. 



7. Asclepias amplexicaulis J. E. Smith. (Man. p. 742; I. F. /. 

 2go§).) In dry fields, mostly in sandy soil, Me. to Fla., Minn., Kans. and 

 Tex. — Pennsylvania : Monroe ; Luzerne ; Bucks ; Delaware ; Ches- 

 ter ; Lancaster ; Franklin ; Fulton ; Huntingdon. 



8. Asclepias exaltata (L. ) Muhl. Poke or Tall Milkweed, 

 (Man. p. 743; I. F. /. 2gii.) In thickets and woods, Me. to Minn., Ga. 

 and Mo. — Pennsylvania : Monroe ; Lackawanna ; Luzerne ; Bucks ; 

 Delaware ; Chester ; Lancaster ; Susquehanna ; Fulton ; Alle- 

 gheny. 



9. Asclepias varlegata L. White Milkweed. (Man. p. 743 ; I. F. 

 /. 2gi2.) In dry woods and thickets, Conn, to 111., Fla., Ark. and La. — 

 Pennsylvania : Northampton ; Bucks ; Delaware ; Chester ; Lan- 

 caster ; York ; Huntingdon. 



10. Asclepias quadrifolia Jacq. Four-lEaved Milkweed. (Man. 

 p. 743 ; I. F. yi 2gij.) Woods and thickets, Me. and Ont. to Minn., N. 

 C. and Ark. — Pennsylvania : Pike ; Monroe ; Northampton ; Bucks ; 

 Delaware ; Chester ; Lancaster ; Montour ; Franklin ; Somer- 

 set; Allegheny. 



11. Asclepias Syriaca L. Common Milkweed. Silkweed. (Man. 

 p. 743 ; I. F. y. 2g/4. ) In fields and waste places, N. B. to the N. W. 



