634 



XXXIV. ERICACEAE 



the testa is carried above ground over the cotyledons, falling to the ground 

 with their expansion. 



The seedling (Fig. 242). 



Roots : primary root terete, tajjcring, short and delicate for about two 

 years, subsequently long and wiry : lateral roots at first few, short, after- 

 wards numerous, moderately long, fibrous, distributed down main root. 



t 



a 



G 



f 



Fig. 242. Rhododendron arboreum. Seedling. 



a, cajisuk! \ ; b, seed X 5 ; c-e, germination stages x 5 ; /, seedling towards end of tirst season x 5 ; 

 g, seedling in third season \ ; h, seedling in fourth season ] . 



Ilypocotyl distinct from root, up to 0-] in. long, terete, cylindrical or tapermg 

 sHghtly upwards, green, glabrous. Cotyledons up to 0-06 in. by 0-04 in,, 

 foliaceous, slightly fleshy, sub-sessile, elliptical or almost orbicular, acute, 

 obtuse or rounded, minutely and somewhat widely serrulate, often tm-ning 

 i(id in the autumn. Stem erect, very short during first two years, elongating 

 slowly during the next few years. Leaves simple, alternate, in fii'st season 

 shortly petiolate, uj) to 0-12 in. by 0-1 in., broadly ovate or orbicular, mucro- 

 iiate, entire, upper surface and margins covered with stiff glandular hairs, 



