The Flora of the Cayuga Lake Basin 345 



104. ASCLEPIADACEAE (Milkweed Family) 



a. Stem erect; crown of 5 hooded bodies with a horn in each. 1. ASCLEPIAS 



a. Stem twiningj crown a fleshy 5-10-lobed ring or disk. 2. Cynanchum 



1. Asclepias (Tonrn.) L. 



a. Flowers orange; leaves alternate; jnice not milky. 1. A. tuberosa 



a. Flowers purple, lavender, or greenish; leaves opposite or whorled; juice milky. 

 b. Leaves closely pinnately veined ; flowers dull pale purple ; follicles echinate. 



2. A. syriaca 

 b. Leaves irregularly veined ; flowers various ; follicles smooth. 



c. Flowers large, greenish ; corolla lobes 6-9 mm. long ; pedicels in fruit de- 

 flexed; plant tall, with large, broad, pointed leaves. 3. A. phytolaccaidcs 

 c. Flowers smaller, purple or lavender; corolla lobes 4-6 mm. long; pedicels 

 erect ; plant lower. 

 d. Hoods purple; leaves opposite; rather tall plants of swamps. 



4. A. incarnata 

 d. Hoods white ; leaves usually whorled ; low slender woodland plants. 



5. A. quadrifoliu 



1. A. tuberosa L. Butterfly Weed. Pleurisy-root. 



Dry sandy and loamy banks, rarely in sandy shale talus, usually if not always 

 in noncalcareous soils; infrequent. July. 



"Case. Cr., Fall Cr., and all the ravines" (D.) ; "abundant on Cayuga L. shore, 

 McKinney's to Aurora" (D.) ; near Valley Cemetery, s. of Ithaca; Coy Glen; 

 Cayuga Heights; occasional along e. side of Cayuga Lake; around the ponds 

 and bogs at Junius. By no means so abundant as Dudley would imply. 



N. H. to Minn., southw. to Fla.. Tex., and Ariz., including the Coastal Plain. 



2. A. syriaca L. (A. Cornuti of Cayuga Fl.) Common Milkweed. 

 Pastures and roadsides, in rich sandy or gravelly loam ; common. July. 

 Absent only on the noncalcareous, more residual, soils of the uplands and lake 



cliffs of the basin. 



N. B. to Sask., southw. to Ga. and Kans., including the Coastal Plain. 



3. A. phytolaccoides Pursh. Poke Milkweed. 



Open woodlands and borders of thickets, in gravelly noncalcareous soils; 

 occasional. July. 



Caroline hills ; between West Danby and Danby ; Connecticut Hill ; n. of Enfield 

 Falls; w. of Cayuta Lake; Coy Glen; Cascadilla Glen, near the Girls' Play- 

 ground; Forest Home Drive; Ellis Hollow; Turkey Hill; Ringwood; and else- 

 where. 



Me. to Minn., southw. to Ga. and Ark. ; infrequent or rare on the Coastal Plain. 



4. A. incarnata L. Swamp Milkweed. 



Marshes and stream banks, in alluvial soil ; common. June 25-Aug. 10. 



N. B'. to Sask., southw. to W. Va., Term., La., and Colo. ; occasional or rare on 

 the Coastal Plain. 



The var. pidchra (Ehrh.) Pers. was said by Dudley to occur " rarely." This was 

 probably an error, as it has not been seen in recent years, and is, in fact, a plant 

 of the Coastal Plain unlikely to be found in central N. Y. Forms of A. incarnata 

 with the flowers pale, like those of var. puIcJira, are occasional. 



5. A. quadrifolia Jacq. 



Dry open woodlands and thickets, in sandy or stony noncalcareous soils: frequent. 

 June 5-30. 



