366 DlffiCIA. [CL. XXII. 



MONADELPHIA. 



25. PI'NUS. PINE. 



Barren Flowers. Catkin deciduous, of numerous, naked, spread- 

 ing stamens, connected by a common stalk. Calyx none. Corolla 

 none. Filaments very short ; anthers erect, wedge-shaped, two- 

 celled, crowned with a jagged membranous crest. 



Fertile Flowers. Catkin egg-shaped, or roundish, of numerous, 

 imbricated, close, stiff, permanent, two-flowered scales. Corolla 

 none. Germens two. Style one to each germen ; stigmas simple. 

 Cone egg-shaped, hard, of numerous woody, permanent scales. 

 Seeds two to each scale, oval, each crowned with a membranous 

 wing. Name from pin or pen, a mountain. 444. 



1. P. sylvestris. Scotch Fir. Leaves in pairs, stiff; cones egg-shaped, 

 acute, as long as the leaves. A tall straight tree, with scaly reddish- 

 brown bark. The wood is of great value for numerous purposes. Resin 

 and tar are obtained from it. The roots are used in many parts of 

 Scotland for candles. Flowers in May : grows in the Highlands of 

 Scotland in extensive forests. Eng. Bot. vol. xxxv. pi. 2460. F.ng. Fi. 

 vol. iv. p. 275. 1373. 



CLASS XXII. DICECIA. 



Plants having Flowers furnished -with Stamens only on one 



individual, and Flowers furnished with Pistils only on 



another individual of the same species. 



Order I. MONANDRIA. One Stamen. 

 (Several species of Saiix.) 



Order II. DIANDRIA. Two Stamens. 



1. SA'LIX. Flowers in imbricated catkins. 



Barren flowers. Calyx a scale. Petals none. Nectary a gland at 



the base of the scale. Stamens from one to five. 

 Fertile flowers. Calyx a scale. Petals none. Nectary a gland. 



Stigmas two. Capsule one-celled, two-valved, many-seeded. Seeds 



with a tuft of hairs. 



Order III. TRIANDRIA. Three Stamens. 



2. EMPE'TRUM. Barren flowers. Calyx deeply divided into three 



segments. Corolla of three petals. Stamens hair-like, from three 

 to nine. 



Fertile flowers. Ciilyi deeply divided into three segments. Corolla 

 of three petals. Stigmas nine. Ben-y superior, two-seeded. 



3. RU'SCUS. Barren flowers. Calyx of six leaves. Corolla none. 



Nectary egg-shaped, tubular, bearing the stamens. 



