332 THE NURSERY-MANUAL 



Helipterum, including Rhodanthe. Composite. 



Seeds sown in early spring under cover, or directly in the open 

 garden. 



Helleborus (Black Hellebore. Christmas Rose). Ranunculaceas. 

 Seeds sown as soon as ripe may be used for the obtaining of 

 new varieties. Root- divisions are usually employed. See Vera- 

 trum for white and green hellebore. 



Hemerocallis (Day Lily). Liliaceoe. 



Propagated by division of the clumps, which should also be 

 divided for the good of the plant. Seeds may be used, sown as 

 soon as ripe, of such kinds as produce them ; the young plants 

 should remain in seed-boxes until the following spring, when they 

 may be planted out in rows. Fig. 50. 



Hepatica. Ranunculacece. 



Propagated by division of the roots in autumn; also by seeds 

 sown very shallow in a moist shaded soil. 



Heracleum (Cow-Parsley. Cow-Parsnip). Umbellifercs. 



Increased by seeds or division, the former usually growing readily 

 if fresh. 



Herniaria. Caryophyllaceas. 



Propagated by division and seed. 



Hesperis (Dame's Violet. Rocket). Cruciferce. 



The single kinds are grown from seeds ; the double forms (which 

 are most prized) by dividing the roots, and by cuttings. 



Heterocentron. Melastomacecs. 



Propagation as for centradenia, which see. 



Heuchera (Alum Root). Saxifragaceas. 



Increased by dividing the clumps in spring or autumn, and also by 

 seeds. 



Hevea (Brazilian Rubber-Tree). Euphorbiacece. 



Propagated by seed, sown as soon as ripe ; also by cuttings. 



Hibiscus. Malvacece. 



Cuttings of green wood are commonly used, made in summer for 

 hardy species or in early spring for tender ones. Cuttings of 



