176 Subtropical Gardening. 



very much at the root in all directions horizontally just 

 below the surface of the soil. By cutting away the 

 runners, and thus concentrating the sap in the central 

 stems, tufts have been obtained from 9 ft. to 13 ft. high, 

 and as much across. Japan. 



Polymnia grandis. (See Montagnxa heradeifolia.) 



Polymnia pyramidalis. A free, bold, and tall 

 plant, with somewhat of a sunflower habit, but withal very 

 fine, and making a tall green growth by the end of July, 

 before many other things used in this way begin to push. 

 The leaves are not so large as those of the other species, 

 and differ in shape, being nearly cordate ; but the growth 

 is vigorous, and the habit distinct. It pushes up a narrow 

 pyramidal head of foliage t6 a height of nearly 10 ft. in 

 Paris gardens, and will be found to do well in the south 

 of England. Easily multiplied in spring by division or 

 cuttings from plants placed in heat in January, or 

 from seed sown in a pot. The species Uvedalia and 

 maculata are rather coarse herbaceous plants, fitted for 

 rough places in warm positions, and deep, rich soil. 

 New Granada. 



*Pontederia cordata. One of the handsomest 

 water-plants in cultivation, combining gracefulness of 

 habit and leaf with beauty of flower. It forms thick 

 tufts of almost arrow-shaped, erect, long-stalked leaves 

 from i^- ft. to more than 2 ft. high, crowned with the 

 handsome blue flower-spikes, which issue from the leaf- 

 stalks just below the base of the leaves. It should be 

 planted in shallow pieces of water. Multiplied by divi- 

 sion of the tufts at any season. N. America. 



Potlios acaulis. A noble plant of the Arum family, 



