GARDEN FLOWERS. 47 



Hope; 1774. A.speciosa (showy); greenhouse perennial; 18 

 inches ; flowers yellow, in June ; Cape of Good Hope ; 1812. 



Arenaria. [Caryophyllaceae.] Small herbaceous per- 

 ennials and annuals, suitable for rock-work. The peren- 

 nials increased by division, the annuals by seed. All grow 

 in good garden soil. 



A. Balerica (Balerian) ; hardy perennial; 3 inches; flowers 

 white, in July ; Majorca ; 1787. A. biflora (two-flowered) ; hardy 

 perennial ; 3 inches ; flowers white, in June ; Switzerland ; 18 18. 

 A. ccEspitosa (tufted) ; hardy perennial ; 3 inches ; flowers white, 

 in June; Switzerland; 1826. A. glanditlosa (having glands); 

 hardy annual ; 3 inches ; flowers purple, in June ; Europe ; 1820. 

 A. nardifolia (spikenard-leaved) ; hardy perennial ; 6 inches ; 

 flowers white, in June ; Siberia ; 1827. 



There are about seventy other species. 



Arethusa. [Orchidaceae.] A genus of only two spe- 

 cies, of which only one is hardy. The plants are very diffi- 

 cult of cultivation, but their beauty richly repays any care. 

 The root is a small tuber, about the size of a large pea. Soil, 

 peat, very wet. 



A. bidbosa (bulbous) ; hardy perennial ; 9 inches ; flowers pur- 

 ple and white, in June ; North America ; in low peaty swamps. 



This plant is dying out in many localities where it was 

 once very plenty. 



Aretia. [Primulacese.] Pretty little perennials, of easy 

 culture in loam and peat. Propagated by division. 



A. Alpina (Alpine) ; hardy perennial ; 3 inches ; flowers pink, 

 in June ; Switzerland ; 1775. A. Helvetica (Swiss) ; hardy per- 

 ennial ; 3 inches; flowers white, in June; Switzerland; 1775. 

 A.pubesce7is (downy) ; hardy perennial ; 3 inches ; flowers white, 

 in June; Switzerland; 1824. A. Vitalia7ia{y\t2iVs)', hardy peren- 

 nial ; 3 inches ; flowers yellow, in June ; Pyrenees ; 1787. A. 

 argejttea is half-hardy. 



All the species are very impatient of standing water at 

 the roots. 



