280 



LJESSOIfS WITH PLANTS 



ei'S, one of which is shown (thrice natural size) 

 in Fig. 278. The calyx is tubular or top-shaped, 

 1 1 with five spreading lobes, 

 and it is beset with hooked 

 bristles. After 



flowering, the ca- 

 lyx-lobes close up 

 and enclose the 

 ovary with its two 

 akenes ; and the whole 

 structure is carried as 

 a bur upon the cloth- 

 ing and upon the fleeces 

 of animals (Fig. 279). 



330«. Comparable structures may be 

 found in the burdock and eockle-bur, ex- 

 cept that it is the involucre (the flowers are 

 eompositous) which bears the bristles. A 

 wholly different type of bur is the 

 Fig. 280. "stick -tight," shown in Fig. 237. 



The witch-hazel. 



331. When October has come 

 and the leaves are fallen, and the last golden- 

 rods have faded, the witch-hazel (Fig. 280) un- 

 curls its yellow ribbon -like petals, as if forget- 

 ful of the season. There are four of thege 

 petals and as many stamens, but four alternating 

 scales suggest that other stamens are wanting. A 

 brown calyx-cup, with four sepal-like lobes, hugs 



