164 



Subtropical Gardening. 



*Nuphar advena. — A hardy Water-lily from N. 

 America, with broad, oval-heart-shaped leaves, some float- 

 ing on the surface of the water, and some emerging 

 well above it. The flowers are rather large, of a golden- 

 yellow colour, with scarlet stamens. This plant is as 

 hardy as our native water-lilies, and is therefore adapted 

 for any position in which they will grow. In N. America 

 it occurs chiefly in still or stagnant waters. The bold 

 and large leaves make it peculiarly suitable for placing 

 near the margin of water in the vicinity of groups of 

 picturesque plants. 



*Onopordum Acanthium. — A native biennial plant 



of bold habit and vigor- 

 ous growth, with stout, 

 branching stems often 

 more than 5 ft. high, 

 and very large, undulat- 

 ing, spiny leaves, covered 

 with long, whitish, cob- 

 web-like hairs. Flowers 

 purplish, in large, soli- 

 tary, terminal heads. 0. 

 illyrictim has greener and 

 more deeply-cut leaves, 

 stiffer stems, a more 

 branching habit, and 

 much more spiny leaves 

 and stems. O. arabicum 

 grows to the height of nearly 8 ft. with an erect and very 

 slightly branching habit, and has both sides of the leaves, 

 as well as the stems, covered with a white down. All these 



Onopordum Acanthium. 



