146 GARDEN FLOWERS. 



be required. If good plants are required, strong young 

 plants should be prepared through one summer for bloom- 

 ing the following spring. Smaller plants, to bloom the same 

 year, may be raised in spring. 



D. glutinosus (clammy) ; greenhouse sub-evergreen shrub ; 4 

 feet; flowers orange-yellow, in summer ; California; 1794. D. 

 Puniceus (scarlet) ; greenhouse sub-evergreen shrub ; 4 feet ; 

 flowers deep crimson, in summer; California ; 1837. 



DIPLOPAPPUS. [Composite.] Hardy or half-hardy per- 

 ennials, some of them sub-shrubby, related to Aster. Com- 

 mon loamy soil. Increased by cuttings or by division. 



DIRCA. [Thymelaceas.] A hardy deciduous shrub, com- 

 monly called Leatherwood, valuable for its early blooming. 

 Common damp soil. Increased by layers. 



D. palustris (marsh) ; hardy shrub ; 5 feet ; flowers yellow, in 

 early spring ; North America ; 1750. 



DISPORUM. [Melanthaceae.] Half-hardy perennial, re- 

 quiring winter protection. Soil, sandy peat. Propagated 

 by division and seed. 



D. fulvum (tawny) ; half-hardy perennial ; 18 inches ; flowers 

 brown, in autumn; China; 1801. D. parviflorum (small-flow- 

 ered) ; half-hardy perennial ; 3 feet ; flowers yellow, in July ; 

 Nepaul ; 1820. 



DITTANY. See ORIGANUM. 



DODECATHEON. American Cowslip. [Primulaceas.] Very 

 pretty, early flowering, dwarf, perennial, herbaceous plants, 

 quite hardy ; preferring to be planted in a soil where there 

 is a good proportion of loam and peat earth, and requiring 

 a cool situation. The flowers are in shape like a half- 

 opened inverted parasol. They are increased without diffi- 

 culty by dividing the roots. Seeds are also produced, from 

 which young plants may be raised by the same process as 

 in raising seedlings of the Auricula, except that, when large 



