CLASS XX. ORDER V. lOo 



calyx 4-cleft inferior : corol : stamens elastic : 

 style 1 : seed 1. Pistillate flowers — calyx 2-leaved : 

 seed covered with the dried elongated calyx. 53. 

 98 — fiensyl-vanica^ (pellitory) involucre longer than 

 the flower, leaves lance-oblong with opake dots. 11. 



MoRUS. Staminate flowers — calyx 4-parted : co- 

 rol 0. Pistillate flowers — calyx 4-leaved : corol : 

 styles 2 : calyx berried : seed 1. 53. 98 — alba, 

 (mulberry) leaves heart-oblique smooth. \ . w. — » 

 rz^(^ra, leaves cordate downy beneath. Tj . w. 



Alnus. Staminate flowers — ameiit composed 

 of wedge-form truncate 3-flowered receptacles : 

 calyx a scale : corol 4-parted, Pistillate flowers — 

 calyx 2-flowered scales : corol : seed compress- 

 ed ovate wingless. 50. 99 — serrulata, (alder) leaves 

 obovate acuminate, stipules oval obtuse. \ . g. 



Buxus. Staminate flowers — calyx 3-leaved : 

 petals 2 : germ a mere rudiment. Pistillate flow- 

 ers — calyx 4-leaved : petals 3 ; styles 3: capsules 

 3-beaked, 3-celled : seeds 2. 38. 96 — semfiervirens, 

 (box) leaves ovate. \ . Var. angusilfolia, leaves 

 lanceolate. Var. suffruticosa, small, leaves obo- 

 vate. 



Order. V. Pentandria. 



Xanthium. Staminate flowers — common calyx 

 imbricate ; corol 5 -cleft, funnel-form : receptacle 

 chaffy. Pistillate flowers — involucre 2-leaved, 1- 

 flowered : corol : drupe dry, muricate, 2-cleft : 

 rut 2.celled — strumarium^ (sea burdock) stem un- 

 armed, leaves cordate 3-nerved, fruit an oval burr. 

 -'-.orientale't leaves 3 to 5-lobed. 



Ambrosia. Staminate flowers — common calyx 

 1 -leaved : corol 1-petalIed, 5-cleft, funnel-form: 

 receptacle naked. Pistillate flow^ers — calyx 1 -leaf- 

 ed, entire, the swelling part 5-toothed, I -flowered : 

 corol 0; nut from the indurated calyx, 1-seeded. 54. 



