Dicotyls or Exogenous Plants. 85 



Pas-si-flo'-ra lu'-te-a L. Passion-flower. — Leaves obtusely :Mobe(l at 

 the summit, the lobes entire; flowers i^reenish-yellow. 



LX. Order THY-IVIE-L>E-A-CE-/E. MEZEREUM FAMILY.— Shrubs 

 with acrid and very tough (not aromatic) bark ; flowers perfect, ovary 

 superior, 1-celled. 



1. Genus DIR'-CA. — Shrub, much branched; leaves oval-obovate, 

 alternate ; flowers light yellow, preceding the leaves, 3 or 4 in a clus- 

 ter ; calyx tubular, stamens and style exserted. 



Dir'-ca pa-lus'-tris J.. Leatherwood : Moosewood. — The wood white 

 and soft, but the fibrous bank exceedingly tough. Damp, rich woods. 



LXI. Order EL-/E-AG-NA'-CE-/E. OLEASTER FAMILY. Shrubs with 



silvery-scurfy opposite leaves, and small nearly sessile axillary flowers. 



1. Genus LE-PAR-GY-R^'-A. {Shepherdia.) — Flowers dioecious, 

 calyx 4-cleft, becoming berry-like in fruit. 



Le-par-gy-rae'-a can-a-den'-sis (L.) Greene. [Shepherdia canadensis 

 Nutt.) Shepherdia. — Leaves elliptical or ovate, silverj-- downy and 

 scurfy with rusty scales beneath. 



LXII. Order LY-THRA'-CE-/E. LOOSE-STRIFE FAMILY.— Herbs; the 

 calyx enclosing (but free from) the ovary and membranous capsule ; 

 flowers often dimorphic. 



1. Genus LY'-THRUM. — Slender herbs; leaves opposite or scat- 

 tered ; calyx cylindrical, striate, 5-7-toothed with little processes in 

 the sinuses, petals 0-7. 



Ly'-thrum a-la'-tum Ph. Loose - strife. — Branches with margined 

 angles ; petals deep purple. 



LXIIL Order A-RA-LI-A'-C/E. GINSENG FAMILY.- Herbs or shrubs; 

 flowers in umbels, styles more than 2 ; fruit a drupe. 



Flowers inoncecioiisly polygamous or perfect, styles 5, fruit black or 



purple Alalia. 1 



Flowers diceciously polygamous, styles 2 or o, fruit bright red or yel- 

 lowish Panax. 2 



