6o6 



ANGIOSPERMAEDICOTYLEDONES 



' Pyreneenbl.,' p. 363.) This species is monoecious. Twenty to thirty male disk- 

 florets with a considerably larger number of female ray-florets are aggregated into 

 a head 4 mm. in diameter. Conspicuousness is enhanced by the cauline leave 

 which are covered with a thick white hairy coat and surround the corymb of tin) 

 heads to form a whitish star of 20 to 40 or 50 mm. in diameter. 



The ray-florets possess a narrow corolla-tube 2^-3 mm. in length, 

 secreting no nectar. The style, of which the branches are closely beset wit 

 stigmatic papillae internally, projects 1 mm. from it. The style is covert 

 externally with short sweeping-hairs for some distance below the point where 

 divides. In male flowers the style does not bifurcate, and therefore posses 

 no trace of stigmatic papillae. It is in the form of a cylindrical rod cover 

 with papillose sweeping-hairs at its end, and serving to brush out the pollc 

 from the anther -cylinder. These pseudo -hermaphrodite male florets possess 



FIG. 198. Gnaphalium Leontopodium, L. (after Herm. Mailer). A. Group of seven heads (nat. 

 size). B. Female ray-floret without the pappus ( x 7). C. Male disk-floret, do. ( x 7). D. End of 



the style of a male floret, which acts as a brush ( x 80). E. Do. of a female floret (x 80). f, sweeping- 

 hairs ; g r, style ; ov, ovary ; po, pollen-grains ; st, stigmatic papillae. 



corolla-tube about 2 mm. in length, expanding into a bell scarcely 1 mm. long 

 from which the anthers and style project. Nectar is secreted at the base of the 

 style. Schroter describes nectar-florets, which resemble the male ones. The) 

 possess a vestigial rudimentary style with quite short sweeping-hairs, but nc 

 stamens (Ber. Schweiz. Bot. Ges., v, 1895, p. 5). 



Kemer states that the stigmas of the female florets become receptive seve 

 days before the pollen of the neighbouring pseudo-hermaphrodite male florets is shed. 



According to MacLeod, the species appears in the Pyrenees in the sub-alpine 

 and lowest mountain region, where it possesses a considerably different habit. It 

 there more vigorous ; the heads are more numerous, and more loosely aggregated ; 

 and the woolly leaves which surround the entire inflorescence are relatively longer. 



Visitors. These are very few. MacLeod saw a Muscid : Herm. Miiller 

 observed a beetle, a Muscid, and Thrips. 



