Hardy Exotic Plants for Naturalization. 107 



Herbaceous perennial ; 4 to 6 feet ; white and green ; 

 summer; division or seed. — Similar positions to preceding. 

 Wave-leaved Rhubarb. Rheum unduMum. China. 

 Herbaceous perennial ; 4 to 6 feet ; white and green ; 

 summer ; division or seed. — Ditto. 



THE BIRTHWORT FAMILY. 

 Great Birthwort. Aristolochia Sipho. North 

 America. Deciduous climber ; 10 to 30 feet; summer; 

 division and cuttings. — A noble plant for covering 

 arbours, banks, stumps of old trees, &c., also wigwam- 

 like bowers, formed with branches of trees. 



THE SPURGE FAMILY. 



Cypress Spurge. Euphorbia Cyparissias. Southern 

 Europe. Herbaceous perennial ; i to 2 feet ; yellow ; 

 summer; division or seed. — Slopes, banks, margins of 

 copses, or rocky places, in any soil. 



Glaucous Spurge. Euphorbia Myrsinites. Southern 

 Europe. Evergreen perennial ; 6 to 9 inches ; yellow ; 

 summer; seed or cuttings. — Bare banks and rocky 

 places in warm soils. 



THE NETTLE FAMILY. 



Rough Gunnera. Gunnera s^cabra. South America. 

 Herbaceous perennial; 2 to 4 feet; summer; flowers 

 inconspicuous ; seed or division. — In warm and 

 sheltered spots, in very deep and moist soil. Fine foliage. 



THE ARROWHEAD FAMILY. 

 Broad-leaved Arrowhead. Sagittaria latifolia plena. 

 North America. Aquatic ; i to 2 feet ; white ; summer ; 



