20 MORPHOLOGICAL BOTANY. 



Section 2. TEXTURE OF LEAVES. 

 The texture of leaves is either tough and leathery, as in 

 the Tsubaki (Camellia japonica) and Yudzuriha (Daphni- 

 phyllum macropodum) (Fig. 25), weak and soft, as in the 

 Sakura (Fig. 16) and Asagao (Kg. 9), thick and juicy, as in 

 the Benkeiso (Sedum alboroseum) and in the bulbs of the 

 Oniyuri (Fig. 12), or thin and flexible, as the underground 

 leaves of the Negi (Allium fistulosum) and Satoimo 

 (Fig. 13). When tough and leathery the leaf is said to be 

 Coriaceous ; when weak and soft it is said to be Herbaceous ; 

 when thick and juicy it is said to be Succulent ; and when 

 thin and flexible it is said to be Membranous. 



I Coriaceous. 

 Herbaceous. 

 Succulent. 

 Membranous. 

 Section S. DURATION OF LEAVES. 

 The duration of leaves is' also different in different cases : 

 some die the same year in which they are developed, as in 

 the Asagao (Fig. 9) and Sakura (Fig. 16) ; some die the 

 second year, as in the Ninjin and Yudzuriha (Fig. 25) ; and 

 others live for many years, as in the Asunaro (Thuya 

 dolabrata) and Sugi (Cryptomeria japonica) . Those which 

 die the same year are said to be Annual ; those which 

 die the second year Biennial ; and the others which live 

 for many years Perennial. 



■ Annual. 



Duration op leaves ■ Biennial. 



■ Perennial. 

 Section 4. KINDS OF LEAVES. 



The leaf is various according to the medium in which it 

 lives and the function which it performs, so that it may be 

 classified in two ways. 



