AMBROSIA, ragweed 
[S: incl. FRANSERIA] (Payne, 1964) 
¢Ambrosia acanthicarpa Hook., annual bursage [S: Franseria 
acanthicarpa (Hook.) Cov.] (Payne, 1964), p. 1541 
A. artemisiifolia L., common ragweed, bitter weed, Roman 
wormwood, hog weed [S: incl. var. elatior Ga} 
Descourt. f. elatior, var. elatior f. villosa Fern. & 
Griscom] (Payne, 1970), p- 1538 
A. bidentata Michaux, tagweed, lanceleaf ragweed, southern 
Tagweed, p. 1537 
A. psilostachya DC., western ragweed [S: A. coronopifolia Torrey 
Gray] (Payne, 1970), p. 1540 
tomentosa Nutt., perennial bursage [S: Franseria discolor 
Nutt.] (Payne, 1964), p. 1541 
A. trifida L., giant ragweed, horse weed, great ragweed, buffalo 
weed [S: incl. var. texana Scheele, var. trifida f. 
integrifolia (Muhlenb.) Fern., var. trifida f. trifida; 
G, M: incl. var. texana] (Payne, 1970), p. 1538 
AMPHIACHYRIS, broomweed, snakeweed 
[S, G: GUTIERREZIA] (Lane, 1979, 1982) 
+A. 
Amphiachyris dracunculoides (DC.) Nutt., broom snakeroot, 
wi S, G: Gutierrezia dracunculoides (DC.) 
S. F. Blake] (Lane, 1979), p. 1478 
ANAPHALIS, pearly everlasting 
*Anaphalis margaritacea (L.) Benth. & Hook. f. ex C. B. Clarke., 
pearly everlasting, p. 1533 
ANTENNARIA, pussytoes 
Antennaria neglecta E. Greene, pussytoes, field pussytoes [S: incl. 
var. campestris (E. Greene) Steyerm.] (Bayer and 
Stebbins, 1982), p. 1532 
S: Steyermark G: Great Plains Flora M: Mohlenbrock 
