ALPHABETICAL LIST OF PLANTS 335 



p. Facchinii {minima x spectabilis). — A strong-growing form of 

 minima. 



P. Heerii {integrifolia x viscosa). — Free habit and crimson 

 flowers. 



P. Sturii {minima x villosa). — Rose-lilac flowers. 



P. kewensis {floribunda x verticilata). — Yellow flowers in whorls. 

 Hardy only in southern counties. 



Prunella grandiflora (Labiatae), Self heal 



Fair, light, rather moist soil in partial shade. Of compact habit, 

 growing about 6 inches high. Flowers violet-purple, produced in 

 August. Fairly hardy. Increased by division. Not of any special 

 merit for the rock garden. 



Other varieties are P. laciniafa, white flower ; P. webbiana^ 

 with rosy-purple flowers. 



Prunus (Rosaceae) 



A genus of hardy trees and shrubs, of which few are at all suitable 

 for the rock garden. 



P. prostrata. — Ordinary soil in open situation. Of semi-prostrate 

 habit. Profusion of rose-coloured flowers in spring. Hardy, 

 deciduous shrub, and increased by cuttings. 



P. pu7nila (syn. Cerasus adepressa). — Open position in ordinary 

 light soil. Prostrate habit. White flowers, borne in umbels during 

 May. Very pretty, and quite hardy and easily cultivated. 



PuLMONARiA (Boraginaceae), Lungwort 



A genus of plants more suitable for borders, though a few varieties 

 may find a place in the less choice parts of the rock garden. Pro- 

 pagated by seed or division. 



P. arvernense. — Ordinary soil in open position. Compact habit, 

 growing about 6 inches high. Flowers purple, borne in early 

 summer. Quite hardy. Increased by division. Other varieties 

 of easy culture are — 



P. angustifolia. — Blue flowers ; and its variety alba^ white flowers. 



P. rubra. — Rose-coloured flowers. 



Pyrethrum (Compositae) 



A genus of herbaceous plants, mostly too coarse-growing for the 

 rock garden ; but the following are of dwarf habit. They are of 

 easy culture in ordinary soil and open position. Propagated by 

 division or seed. 



