Hardy Exotic Plants for Naturalization. 55 



summer ; seed or division. — Margins of shrubberies, beds 

 of American plants, and copses. 



Purple Aubrietia. Aubrietia deltoidea, and vars. 

 Southern Europe. Evergreen perennial ; 4 inches ; 

 purple ; spring and early summer ; seed, division, or 

 cuttings. — Anywhere amidst very dwarf vegetation : on 

 rocky or bare ground, banks or slopes, it should be 

 planted in profusion. 



Alpine Mad-wort. Alyssum alpestre. Southern 

 Europe. Evergreen perennial ; 4 inches ; yellow ; 

 summer ; seed or cuttings. — A very neat little plant to 

 estabUsh on bare rocky upland ground, or on ruins. 



Bock Mad-wort. Alyssum saxatile. Russia. Ever- 

 green perennial: 12 to 18 inches; yellow; spring and 

 early summer ; seed, cuttings, or division. — Should be 

 abundantly planted on bare and rocky ground, on banks 

 and slopes, associated with all showy alpine plants like 

 the white Arabis and purple Aubrietia. 



Sweet Alyssum. Alyssum maritimum. Southern 

 Europe. Annual ; i foot ; white ; summer ; seed. — Stony 

 or bare ground where the vegetation is dwarf and sparse. 



Mountain Mad-wort. Alyssum montanum. Germany. 

 Evergreen perennial ; 3 to 6 inches ; yellow ; summer ; 

 seed, cuttings, or division. — On rocky ground that is 

 rather sandy and not too wet, or on bare banks. 



Sea-green Whitlow G-rass. Draha aizoides. Europe. 

 Evergreen perennial ; 3 inches ; yellow ; spring ; seed or 

 division.— Old ruins, walls, and rocks, on which there is 

 a very minute vegetation. It is naturahzed in one or 

 two places in England. 



Stemless Violet-Cress. lonopsidium acaule. Portugal. 



