CLASS XX. 161 



B. Stems woody. 



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

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

 calyx 'Ji strobiles or cones, scales closely imbricate, 2-fiowered : pistil 

 1 ; nu t with a membranous wing:. (pine.) 



CLAPS xx. DICECIA. Staminate and pistillate flowers on dif- 

 ferent plants. 



Order 2. Diandria. Two stamens. 



SA'LIX. Staminale 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"ULTJS. Staminate flowers calyx 5-leaved ; corolla 0; anthers 

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

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

 infloresence strobile-form. (hop.) 



Exotiz. 



CAN"NAEIS. Staminale 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 atom scale ^ 

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

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

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

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



NOTE. The 21st Class, Cryptogamia being too difficult for the be 

 ginner in Botany to analyze, is omitted. 



