366 DIGECIA. [CL. XXII. 



MONADELPHIA. 



25. PI'NUS. PINE. 



Barren Flowers. Catkin deciduous, of numerous naked, 

 spreading 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 nume- 

 rous, 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 nume- 

 rous purposes. Kesin 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. Eng. Fl. vol. iv. p. 275. 1373. 



CLASS XXII. DKECIA. 



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 Salix.) 



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. Calyx deeply divided into three segments. 

 Corolla of three petals. Stigmas nine. Berry superior, two- 

 seeded. 



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



Nectary egg-shaped, tubular, bearing the stamens. 



