SPECIES AND VARIETIES. 259 



** May-florets having a style. 



A. arvensis : annual ; stem 1-2 feet high, downy, much 

 branched^ sometimes decumbent, the leafy branches termi- 

 nating in single flower-heads ; leaves bipinnatifid, hairy, the seg- 

 ments linear-lanceolate; flower-heads solitary, the ray-florets 

 white, always having a style ; receptacle conical, with lanceolate 

 scales beween the florets. — Cultivated fields. FL June, July. 



Var. maritima, with a stem of more spreading habit, thicker 

 leaves, a flat receptacle, and subulate scales, has been called 

 j4. anglica. — North-east coast. 



A. nobilis : stem procumbent or creeping, branched, the 

 flowering branches short, ascending, leafy; leaves bipinnate, 

 the leaflets linear- subulate, somewhat downy, pleasantly aro- 

 matic ; flower-heads on terminal peduncles, with white rays ; 

 inner involucral bracts scarious at the top ; scales of the re- 

 ceptacle broad, obtuse. — Commons and sandy pastures. Fl. 

 July, August. 



(146) AchiUea. 



A. Ptarmica : stems erect, glabrous, 1-2 feet high, nearly 

 simple ; leaves broadly linear, regularly serrate ; flower-heads 

 few, in a loose terminal corymb; florets of the ray 10-15, 

 short, broad, white. — Sneezewort. — Moist hilly pastures. Fl. 

 July, August. 



A. Millefolium: stems numerous, short, leafy, the flo fleer- 

 ing ones erect, almost simple, about one foot high; leaves 

 oblong or linear, finely cut into a multitude of short, narrow, 

 deeply pinnatifid segments; flower-heads numerous, small, 

 ovoid, in a dense terminal corymb ; the ray-florets 5-6 in each 

 head, white or pink. — Milfoil or Yarrow. — Pastures, meadows, 

 and waste places. Fl. June to August. 



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