CLASS XX. 161 



B. Stems woody. 



PI'NUS. Staminate flowers calyx 4-leaved, peltate ; corolla 0; sta- 

 mens many; anthers naked, 2, sessile, 1-ceiled. Pistillate flowers - 

 calyx ; ji strobiles or cones, scales closely imbricate, :?-flowere*i : pisC* 

 1 ; mu with a membranous wing. (pine.) 



CLASS xx. DIGECIA. Staminate and pistillate flowers on dif 

 ferent plants. 



Order 2. Diandria. Two stamens. 



SA'LIX. Staminate flowers ament cylindric; calyx a 1 -flowered 

 scale, with a nectariferous gland at the base ; stamens 1 to 6. Pistillate 

 flowers ament and calyx like the Staminate ; stigmas 2, generally 2- 

 cleft ; capsule 1-celled; 2-valved ; seeds many, with egret-like down. 



'willow.) 



Order 5. Pentandria. Five stamens. 



HUM"CLUS. Staminate flowers calyx 5-leaved ; corolla 0; snthers 

 with two pores at the extremity. Pistillate flowers calyx 1-leaved; 

 entire, oblique, spreading; styles 2, seed 1, within the leaf-iike calyx, 

 infloresence strobile-form. (hop.) 



Exotic. 



CAN"NABIS. Staminate flowers calyx 5-parted. Pistillate flowers 

 -calyx 5-leaved, entire, gaping laterally ; styles 2 ; nut 2-valved, with- 

 in the closed calyx. (hemp.) 



Order 8. Octandria. Eight stamens. 



PO'PULUS. Staminate flowers ament cylindric, calyx a torn scale j 

 corolla turbinate, oblique, entire, supporting 8 to 30 stamens. Pistillate 

 flowers ament, calyx and corolla like the Staminate ; stigma 4 or 6- 

 iooed: capsule 2-celled, 2-valved, many-seeded; seed with egret-like 

 hairs. Leaves have a tremulous motion. (poplar, balm of Gilead.; 



NOTE. The 21st C?ass, Cryp ogamia being too difficult for the be. 

 ginner in Botany to anaivze. is omitted. 



