ANNOTATIONS AND ADDITIONS. 193 



development they would be flowerless and fruitless plants, 

 forming buds or bulbs; the spores or sori on the under 

 side of the frond not being seeds but flower buds. 



(29) p . 28. "Liliacea." 



The principal seat of this form is Africa, where it is both 

 most varied and most abundant, and where these beautifully 

 flowering plants are assembled in masses and determine the 

 aspect and character of the country. The New Continent 

 does, indeed, also possess superb Alstromerise and species of 

 Pancratium, Hsemanthus, and Crinum (we augmented the 

 first-named of these genera by nine, and the second by three 

 species) ; but these American Liliaceae grow dispersed, and 

 are less social than our European Iridese. 



( 30 ) p. 28." Willow Form." 



Of the leading representative of this form, the Willow 

 itself, 150 different species are already known. They are 

 spread over the northern hemisphere from the Equator to 

 Lapland. They appear to increase in number and diversity 

 of form between the 46th and 70th degrees of north latitude, 

 and especially in the part of north of Europe where the con- 

 figuration of the land has been so strikingly indented by 

 early geological changes. Of Willows as tropical plants I am 

 acquainted with ten or twelve species, which, like the willows 

 of the southern hemisphere, are deserving of particular 

 attention. As Nature seems as it were to take pleasure in 

 multiplying certain forms of animals, for example Anatidse 

 (Larnellirostres) and Columbse, in all the zones of the earth ; 



VOL. II. 



