262 



COMPOSITiE 



of 2 — 5 barbed bristles. (Name from the Latin hi, double, dens^ 

 a tooth, the teeth on the fruit being themselves toothed.) 



I. B. cernua (Nodding Bur- Marigold). — A somewhat succulent 

 plant, I — 2 feet high, with stem often reddish ; simple, lanceolate, 

 serrate, glabrous leaves ; and terminal, solitary, drooping, button- 

 like heads of brownish-yellow florets, with several leafy bracts, but 

 rarely any ray-florets. The fruit, which forms a pretty object for 

 the polariscope, is oblong and terminates in 3 or 4 stiff bristles, 

 each thickly set with minute recurved barbs, so as to take a firm 



hold on the coat of any animal 

 which comes in contact with 

 them. — Watery places ; fre- 

 quent. — Fl. July — October. 

 Annual. 



2. B. tripartita (Trifid Bur- 

 Marigold). — Distinguished 

 from the last by its stalked 

 3-partite leaves ; smaller, nearly 

 erect heads, which more often 

 have ray-florets ; and 2, or 

 rarely 3, bristles on the fruit. — 

 Watery places ; frequent. — Fl. 

 July — September. Annual. 



^14. Galinsoga, represented 

 by G. parvi flora, an escape from 

 Kew Gardens, now naturalised 

 in many places, is a South 

 American genus, with opposite, 

 broad, serrate leaves and small 

 heads, the 4 — 6 short, broad, 

 white ray-florets of which, sur- 

 rounding the yellow disk, might 

 lead at first to the heads being 

 mistaken for flowers of some other Order. (Named in honour 

 of Don M. de Galinsoga, a Spanish botanist, but corrupted into 

 " Gallant Soldier.") — Fl. July — October. Annual. 



15. Achillea (Yarrow). — Stiff plants; leaves scattered; heads 

 in corymbs, with few, ligulate, broad, white ray-florets ; flat, scaly 

 receptacle ; fruit compressed ; no pappus. (Named after Achilles, 

 with reference to supposed healing properties.) 



\. A. Millefolium (Common Yarrow or Milfoil). — Stems very 

 tough, angular, 6 — 18 in. high; leaves bipinnatifid, with a lanceo- 

 late general outline, woolly or slightly hairy ; leaflets cut into 



ACHILLEA PTARMICA {Sucezewort). 



