DIOECIA PENTANDRTA. 443 



397. OUPRESSUS. 



C. thuy aides : branchlets ancipitous ; leaves imbricate in 4 rows, ovate, 

 tuberculate at the base ; cones subspherical, angular. 



HAB. Swamps. A large tree ; leaves minute, perennial ; cones very 

 small. 



398. ACALYPHA. Three-seeded mercury. 



A. virginica : pubescent ; leaves on short petioles, lanceolate-oblong, 

 serrate ; involucrum cordate, ovate, dentate, axillary, nerved, dentate, 



HAB. Dry gravelly soil. Aug. @ ; stem, 8 15 inches high, erect } 

 pubescent ; invol. subsessile. 



(Genera. 



DIOECIA. 

 DIANDRIA. 



#9. SALIX. Stam. PI. Ament cylindric; scales 1-flowered, imbricate, 

 with a nectariferous gland at the base ; calyx and corolla ; stamens 

 1 5. Fertile Fl. Scales of the ament 1-flowered ; calyx and corolla 

 0; stigma 2, mostly bifid; capsule 1-celled, 2-valved, many-seeded; 

 seeds comose. 



400. FRAXINUS. Calyx 0, or 3 4-cleft; corolla 0, or 4-petaled; 

 stamens 2 ; capsules 2-celled, 2-seeded, compressed and foliaceous at 

 the extremity ; seeds solitary, pendulous. Polygamous. 



TETRANDRIA. 



401. MYRICA. Ament ovate-oblong; scales lunulate. Stam. PI. 

 stam. 46 ; anthers 4-valved. Fertile. Germen 1 ; stig. 2 ; drupe. 

 1-celled, 1-seeded. 



PENTANDRIA. 



402. NYSSA. Perfect Fl. Calyx 5-parted; corolla 0; pistil I] drupe 

 inferior; nut 1-seeded. Sterile. Stamen 5, 8, 10, or 12, inserted 

 around a peltate gland. 



403. ZANTHOXYLUM. Stam. Fl. Calyx 5-parted ; corolla ; 

 stam. 356. Fertile. Capsule 3 5 celled, each 1-seeded. 



404. ACNTDA. Stam. Fl. Calyx 5-parted ; corolla 0. Fertile, Ca- 

 lyx 3-parted ; corolla 0; styles ; stis. 8, sessile ; capsule 1 -seeded. 



405. STIMULUS. Stam Fl. Calyx 5-leaved ; anthers with 2 pores at 

 the extremity ; corolla Q. Fertile. Calyx 1 -leaved, large, persistent, 

 concave, entire; corolla 0; styles %\ seed 1. 



