290 ROCK GARDENS 



a handsome plant, with its graceful sprays of coral-red flowers. 

 They all are easily cultivated in any ordinary, well-drained soil. 

 They require to be divided and replanted every few years, as they 

 grow out of the ground. 



HiERACiUM (Compositae), Hawkwccd 



A very large genus, very few of which are suitable, being mostly 

 of too coarse and rank-growing a habit. They are all of the easiest 

 culture in any soil. Propagated by division in spring. 



H. rubra. — Dwarf-growing and spreading habit, very vigorous, 

 forming a carpet, only about i inch high, of dark green leaves. 

 The flowers, which are borne in great profusion on stems about 3 

 inches high, are of a brilliant, deep orange-red colour. It is in 

 bloom all the summer. A very pretty plant, but too strong-growing 

 to associate with the choicer rock plants. Increased by division. 



H. villosum. — Forms good tufts, about 6 inches high. Flowers 

 bright yellow, on stems about 12 inches long. The leaves and stems 

 are clothed with long, white, silky down, which gives it a very 

 attractive appearance. A good plant. Grows very freely from seed. 



Other kinds are : H. aurantiacum, which is similar to rubra, but 

 flowers orange-yellow. Good for the wild garden, but too rampant 

 in growth for the choicer parts. 



H. gy7nnocephalum. — Yellow flowers and silvery foliage. Grows 

 about 9 inches high. 



H. lanatum. — Yellow flowers and evergreen, downy, leaves. 



HiPPOCREPis coMOSA (Leguminosae), Horseshoc Vetch 



A prostrate-growing native plant, of trailing habit. Light, chalky 

 soil in sun. Small pinnate leaves, and deep yellow flowers in 

 clusters. A pretty and useful little plant for draping the face of a 

 rock. Hardy, and of easiest culture. 



HORMINUM PYRENAICUM (LaBIATAE) 



Forms dense tufts of thick, crinkly leaves, from which rise spikes 

 of purplish-blue flowers in July and August. Not of easy culture. 

 Not a plant of much value or interest. Increased by seed and 

 division. 



HousTONiA (Rubiaceae) 



Delicate and dainty-growing little plants, which are difficult to 

 succeed with, but they are worth some trouble. They like a soil 

 composed of peat, sand, leaf-mould, and fibrous loam, in an open, 



