37. Achillea Le Yarrow, Milfoil, 
Perennial nerds with alternate vinnatifid leaves with numerous smll 
linear segments. Head numerous, mostly radiate. Involucres mostly ovoid, 
consisting of several series of membranous bracts with prominent midveins and 
scarious margins, passing into the smaller ana tninner bracts of the disc. 
Ray-flowers few, commonly 5, sometimes wanting, ristillate, fertile, their 
corollas comaonly white sometives pinkish; disc corollas whitish. Achenes 
oblong: or ovate, strongly flattened, bearing @ callous margins pappus non®, 
foe 
pee Se 
le Ae millefolium lL. var. lanulosa (Nutt.) Piper. 
| wepovensice Derlg with usually tufted stems 50-60 cm. tall, thinly pubescent 
with fine shasgy hairs, especially so at the nodes; leaves narrowly oblong- 
oblanceolate, 5-15 cme lon’, pinnately divided into numerous segments, these 
again once or twice pinnatifid or toothec, the ultimate segments 1-£ mm. long, 
scarcely .5 mn. wide, acute,thinly woolly throughout with fine hairs, the 
lower leaves borne on snort dilated petioles, the upper sessile or nearly so, 
heads numerous in flat-topped or convex terminal clusters, their involucres 
5-5 mm. tali, mostly ovoid, the bracts sreen, thinly wooliy and sometimes with 
sessile clands , Sides tle rma j ronWar brownish; 
ray-flowers mostly 5, their corollas dull white, or rarely pinkish, 5-4 ma. long, 
the blades subrotund, entire or toothed, spreadinz; achenes «< mm. long. 
co 3 
z ) Abundant at ali elevations in open places. 
i ss ice 
%, 
x 
os \. 
Nw 
\ 
Si 
ms, ‘ 
A i 
. 3 
AN 
*~ 
me 1 
~\ F| 
< 
ee ed 
