332 SYNGENESIA POLYGAMIA FRUSTRANEA. [CL. XIX. 



Seed inversely egg-shaped, abrupt ; seed-down none. Recep- 

 tacle narrow, covered with lance-shaped, chatfy scales. 

 Named after Achilles. 406. 



1. A. Ptdrmica. Sneeze-wort. Goose-tongue. Leaves narrow, 



lance-shaped, pointed, acutely serrate, smooth. Stem simple, 



erect, from six inches to two .feet high, terminating in a large, 

 nearly simple corymb, with white flowers : leaves very minutely, 

 acutely, doubly serrated. Perennial : flowers from the middle of 

 July to the end of September : grows in moist pastures, by ditches, 

 and at the edges of corn-fields : not uncommon. Eng. Bot. vol. xi. 

 pi. 757. Eng. Fl. vol.iii. p. 460. 1219. 



2. A. serrdta. Serrated Yarrow. Leaves narrow lanceolate, ses- 

 sile, downy, deeply serrate, laciniate at the base ; flowers almost 



simply corymbose. Stem simple, erect, downy, about eighteen 



inches high, terminating in a simple or slightly branched corymb 

 of yellowish flowers, much inferior in size to those of the last spe- 

 cies, of which, however, it is probably a mere variety. Perennial : 

 flowers in August : found near Matlock, Derbyshire, by Mr. Hupp 

 and Mr. Williams. Eng. Bot. vol. xxxvi. pi. 2531. Eng. FL vol. 

 iii. p. 461. 1220. 



3. A. Millefolium. Common Yarrow, or Milfoil. Leaves twice 

 pinnate, with lance-shaped, pointed segments, hairy on the back ; 



stems furrowed. Stems commonly decumbent at the base, then 



erect, about a foot high, terminating in a dense, often- divided co- 

 rymb, with white or purplish flowers. Perennial : flowers from 

 the middle of June to the end of October : grows on banks, by 

 road- sides, and in dry pastures : common. Eng. Bot. vol. xi. pi. 758. 

 Eng. Fl. vol. iii. p. 462. 1221. 



4. A. tomentosa. Woolly Yellow Milfoil, or Yarrow. Leaves 

 twice pinnatifid, with linear, acute, crowded segments ; corymbs 



repeatedly compound. Stems about a foot high, decumbent at 



the base, then erect, terminating an often-divided corymb of yel- 

 low flowers. Perennial : flowers in July and August*: on Spittle 

 Hill, Dumbartonshire, and on hills near Paisley, discovered by 

 Mr. Hugh Boss : also in Ireland. Eng. Fl. vol. iii. p. 462. Eng. Bot. 

 pi. 2532. 1222. 



POLYGAMIA FRUSTRANEA. 

 42. CENTAURE'A. CENTAURT. KNAPWEED. 



Common calyx roundish, closely imbricated, with scales of 

 various forms. Compound corolla of numerous tubular florets ; 

 those of the disk perfect, regular, with five equal, spreading 

 segments, an oblong limb, and a slender tube ; those of the ray 

 fewer, with a rudimentary pistil, not perfecting seed, spreading, 

 often wanting, funnel-shaped, with five or more unequal seg- 

 ments. Filaments hair-like, very short ; anthers united into a 

 cylindrical tube. Germen small, oblong. Style thread-shaped, 

 about the length of the stamens; stigma blunt, often cleft, 

 prominent. Style and stigma very small in the florets of the 

 ray. Seed in the disk only, of various forms ; seed-down 

 various, or wanting. Receptacle bristly. Named after the 

 Centaur Chiron. 407. 



