312 ROCK GARDENS 



Nertera depressa (Rubiaceae) 



A very diminutive, creeping plant for a moist spot. It forms a 

 close, compact mat of bright green leaves about 2 inches high. 

 The flowers are inconspicuous, but the bright orange-red berries 

 which appear in autumn are most attractive. It is not very hardy, 

 and should be protected from snow. Increased by division. 



NiEREMBERGIA (SoLANACEAE) 



An attractive genus of perennial plants. 



IV. Frutescens. — A most dainty and attractive plant, like a Linum 

 both in foliage and flower. It likes a rather dry and sheltered 

 position in sandy loam. It forms a half-shrubby plant, about 12 

 to 18 inches high. The flax-like flowers are blue, shading to white 

 at the edges, and are most lovely. This most attractive plant is 

 unfortunately not very hardy, except in a mild climate. Propagated 

 by seed and cuttings. 



N. gracilis. — Light sandy soil in sun. Grows 6 to 12 inches 

 high. Flowers white, streaked with purple, centre yellow. Blooms 

 in the summer, and very freely. A most attractive, though not very 

 hardy plant. 



A^. Rivularis. — Requires a damp soil. It is a dwarf and creeping 

 plant, spreading rapidly by means of underground stems. The 

 ovate leaves rise about 3 inches from the ground. The cup-shaped 

 flowers are creamy-white, and rise just above the foliage. It is a 

 shy bloomer, though of free growth and quite hardy. Easily 

 increased by division. 



CEnothera (Onagraceae), Evening Primrose 



A few species of this large genus may find a home in the rock 

 garden, though they are, more strictly speaking, border plants. 



(K. caespitosa (syn. CE. eximia and marginatd). — Requires a light 

 loamy soil. Not particular as to aspect. It is of trailing habit, and 

 grows about 9 inches high. Large white flowers, changing to pale 

 rose colour, and sweet-scented. A handsome plant, of easy culture, 

 and increased by cuttings or division. It is night-flowering. 



Qi. eximia (see CE. caespitosa). 



CE. fruticosa Youngii. — Ordinary, well-drained soil. Grows 

 about 18 inches high, and bears a profusion of bright yellow flowers 

 during the summer. A very good species, also night-flowering. 



CE. Fraseri. — Well-drained, light soil. Grows about 12 inches 

 high. Bright yellow flowers in great profusion, from July to 

 October. Of easy culture. This plant is a variety of CE. glauca. 



CE. marginata (see CE. caespitosa). 



