26 
Asclepias syriaca L., common milkweed [S, M: incl. var. kansana 
(Vail) E. J. Palmer & Steyerm.] (Sparrow, 1946; 
Woodson, 1954), p. 1206 
A. tuberosa L., butterfly weed, chigger flower, pleurisy root, 
03 
Ssp. interior Woodson [S: A. tuberosa var. interior (Woodson 
Shinn., incl. f. lutea (Clute) Steyerm.] (Woodson, 1954, 
1964) (note that the transfer of ssp. interior to varieta 
status was relatively arbitrary) 
A. variegata L., variegated milkweed, p. 1206 
verticillata L., whorled milkweed, horsetail milkweed, p. 1208 
A. viridiflora Raf., green milkweed [S: incl. var. lanceolata (Ives) 
Torrey, var. linearis (A. Gray) Fern.] (Woodson, 1954), 
1202 
> 
> 
p. 
. viridis Walter, green-flowered milkweed, spider milkweed, 
p. 1202 
CYNANCHUM, sand vine 
Cynanchum laeve (Michaux) Pers., angle-pod, sand vine, climbing 
ilkweed, blue vine, p. 1210 
GONOLOBUS, angle-pod 
S, G, M: MATELEA 
(Woodson, 1941; Rosatti, 1989) 
Gonolobus gonocarpus (Walter) Perry [S, G, M: Matelea 
8enocarpa (Walter) Shinn.] (Woodson, 1941; Rosatti, 
1989), p. 1211 
MATELEA, climbing milkweed 
(see also GONOLOBUS) 
Matelea baldwyniana (Sweet) Woodson, p. 1211 
M. decipiens (Alexander) W im, *p. 1211 
M. obliqua (Jacq.) Woodson, p. 1211 
S: Steyermark G: Great Plains Flora M: Mohlenbrock 
