310 FLORA HISTORICA. 



lieio'ht, havinir a root which descended to near two 

 fathoms in depth ; and in sucli spots the stems were 

 from two to three feet high, or more. 



These large tuberous roots require to be planted 

 in a warm, dry, and sheltered situation, where the 

 mould is light or of a sandy nature, and when the 

 roots have become large they should not be trans- 

 planted. It is generally raised from imported seed, 

 but in favourable seasons it sometimes perfects its 

 seed in this country. This species was cultivated 

 in the Royal Garden at Hampton Court as long 

 back as the year 1690. 



Those whose grounds are more of a swampy than 

 a dry nature, may cultivate the Rose-coloured Swal- 

 low-wort, or Water Silk weed, Asdepias Incarnata, 

 which grows naturally in swampy places, and on 

 the banks of rivers in North America, and flowers 

 in July and August. It was first cultivated in this 

 country in the year 1710, and is an ornamental 

 plant for the borders of lakes or ponds. 



