APETALOUS EXOGENOUS PLANTS. 515 



angled; leaves large, smooth, deltoid -ovtite, acute or slightly 

 acuminate, truncate at the base, obtusely serrate with in- 

 curved teeth ; the conspicuous veins and compressed petiole 

 yellowish. Banks of rivers. March and April. — A large 

 tree; leaves 6-8' long, longer than the petiole. 



Sub-class II. Gymnospermee. 



Ovules naked (not inclosed in an ovary), commonly supported by an 

 open scale or leaf, and fertilized by the direct application of the pollen. 

 Cotyledojis often more than two. 



- 124. PINE FAMILY. Order, Conifers. 



Trees or sUruhs, with branching steins, composed of 

 glandular or disk-bearing woody tissue without ducts, 

 resinous juice, linear or needle-shaped mostly persistent 

 leaves, ?L\idi moncBcious or dioecious amentaceous /oz/je?'^; 

 calyx and corolla none; ovules orthotropous ; fruit a cone 

 or drupe ; emhryo in the axis of the albumen ; cotyledons 2 

 or more. 



SYNOPSIS. 



Sub-order I. Abietineae. Fertile fioioers consisting 

 of numerous bracted imbricated carpellary scales, bearing 

 two collateral inverted ovules at their base, and forming a 

 cone in fruit. Buds scaly. 



Leaves 2-5 iii a cluster, mostly elongated, sheathed at the base Pinus. 



Sub-order II. Cupressineae. Fertile floivers conslst- 



ing of few bractless mostly peltate carpellary scales, bear- 

 ing one or several erect ovules at their base, becoming 

 fleshy or indurated, and forming in fruit a drupe or cone. 

 Buds naked. 



Fruit a drupe. Leaves minute, imbricated Junipert-s. 



a globular cone, with pelf ate scales. Leaves imbricated, persistent . .CvvuE^sr?. 



