296 AMERICAN MIDLAND NATURALIST 
standing upright. On the page of the NATURALIST quoted I have 
attributed my plant to low prairies of Southern Michigan. I 
observed it there only from my window on the railway train, 
but have no doubt that the plant was the same afterwards studied 
and collected in adjacent Ontario; through I must say that the 
low white-flowered prairie plant quite failed as we passed into the 
wooded and marshy regions skirting the St. Clair River and lower 
Lake Huron, not reappearing until we were well out upon the 
prairie region of Ontario. Moreover, Mr. C. K. Dodge, who has 
sent me meadow rues from all about Port Huron, has not met with 
this plant there. Nor have we, in U. S. Herb., any member of 
this particular group from any part of Michigan. All that has 
been named “T. polygamum”’ from those parts belongs to the 
T. purpurascens ailiance. There is, however, one sheet of exactly 
T. perpensum in the National Herbarium, but this also comes 
from Ontario, where it was gathered at Elmira, 13 July, 1899, 
by L. M. Umbach. I am, however, quite confident that the white- 
flowered one of the Southern Michigan prairies will prove to be 
the same. 
ACHILLAEA MULTIFLORA HOOK IN NORTH DAKOTA. 
BY J. LUNELL. 
Planta de rhizomate brevi oriens, perennis. Caules singulares 
vel interdum duo, usque inflorescentiam plerumque simplices, 
nonnumquam autem prope basin in 2-3 ramos principales divisi, 
supra corymbosi, 0.6-1 m. alti, leviter lanati, imprimis in iugis 
de basibus foliorum utrinque descendentibus. Folia basilaria et 
surculorum sterilium inferiora petiolata, caulina sessilia, numerosa, 
linearia vel anguste lineari-lanceolata, 2-10 cm. longa, 0.5—-1 cm. 
lata, in surculis sterilibus glabrata, in plantis fertilibus superne 
laxe, subtus quidem densius lanata, ad glabritudinem magis 
minusve proclivia, pinnatifida lobis primis in lobis spinuloso- 
dentatis mensurae variabilis iterum fissis. Inflorescentia corymibus 
est compositus, apice plano vel plerumque ramis remotis de axillis 
eius foliorum® infimis oriundis centralibus= magnopere altioribus, 
ramis eius rigidis et robustis. Capitula numerosa, 7 mm. alta, 
4mm, lata. Involucra 4mm. alta, 4 mm. lata, late campanulata, 
