524 ON SEEDLINGS 



upper side of the petiole, and densely covered with small oily glands 

 on the upper surface, most distinctly visible when young ; petiole 

 semiterete, flat above, somewhat dilated at its insertion on the 

 stem. 



No. 1. Narrowly cuneate, serrate above the middle. 



Nos. 2-4. Cuneate, or subrhomboid, shallowly trifid and serrate, 

 similar to the leaves of the common Hawthorn (Cratsegus Oxy- 

 acantha. 



Nos. 5 and 6. Narrowly ovate, cuneate at the base, irregularly 

 and slightly doubly serrate. 



Nos. 7-10. Oblong, acute, cuneate at the base, sharply and some- 

 what doubly serrate. 



The seedling bears considerable resemblance to a young Cratsegus 

 or Prunus, both in the cotyledons and leaves. It also resembles a 

 young Betula, but the cotyledons are much larger, and the leaves 

 from the seventh onwards become oblong. The glands on the stems 

 and leaves, the penninerved venation and the oblong leaves from the 

 seventh onwards are however characteristic of Myrica. The small 

 tubercles on the roots recall those of Alnus cordifolia amongst the 

 Cupuliferas. 



CASUARINE.E. 



Benth. et Hook. Gen. PL iii. 401. 



Fruit and Seed. The ovary is very small with twin, col- 

 lateral, ascending, semi-anatropous ovules, having a superior 

 micropyle. The fruits are ovoid or cylindrical, covered with 

 accrescent bracts and bracteoles, and arranged in a dense 

 cone-like head. The nut is laterally compressed, produced into 

 a wing running along the sides of the style and indehiscent. 

 The seed is solitary by abortion and exalbuminous. The em- 

 bryo is straight with flattened cotyledons and a superior radicle. 



Seedling. The cotyledons of Casuarina Cunninghamiana 

 (fig. 664) are oval, obtuse, and sessile. The stem is quad- 

 rangular in the seedling stage. The first two leaves are 

 opposite, followed by at least nineteen whorls of four leaves 

 each, decussating and forming the angles of the stem. They 

 are adnate to the stem for the greater part of their length and 



