ASTERACEAE (COMPOSITAE), daisy family 
ACHILLBA, yarrow, milfoil 
Achillea millefolium L., yarrow, common milfoil, nosebleed, 
1599 
p. 1 
var. lanulosa (Nutt.) Piper ex Piper & Beattie [S: A. 
millefolium ssp. lanulosa (Nutt.) Piper] (Piper (April 
1901) published the trinomial Achillea sega ium 
lanulosa without formal designation of a r 
According to Article 35.2 of the latest Seaptesntionst 
Code of Botanical Nomenclature (Greuter et al., 
1988), taxa published after 1890 that are not assigned a 
rank are validly published, but the first author assigning 
a rank to such a taxon is to be followed and cited as 
authority for the combination. The earliest subsequent 
usage of this trinomial was by Piper and Beattie (May 
1901), who attributed the combination to Piper and 
assigned it the rank of variety.) 
¢var. millefolium 
f. roseum Rand & Redf. [M: A. millefolium var. 
millefolium] (Rousseau, 1938) 
ACMELLA [S: SPILANTHES] (Jansen, 1985) 
Acmella oppositifolia (Lam.) R. Jansen [S: Spilanthes americana 
L. f.) Hieron.] (Jansen, 1985), p. 1564 
var. repens (Walter) R. Jansen [S: Spilanthes americana var. 
repens (Walter) A. Moore] (Jansen, 1985) 
AGERATUM, ageratum 
+Ageratum conyzoides L., p. 1468 
ssp. conyzoides 
AGOSERIS (see MICROSERIS) 
S: Steyermark G: Great Plains Flora M: Mohlenbrock 
