GARDEN FLOWERS. 181 



feet high, bears spikes of curiously shaped, showy flowers 

 in summer. The plant on a warm evening gives off a gas 

 so abundantly that a lighted match applied to the flower 

 ignites it and produces a bright flash. Digitalis purpurea 

 (common foxglove) is a well-known and very ornamental 

 plant. The quaintly shaped flower and color, varying from 

 white to dark purple, combine to produce this excellent 

 effect. It grows three to 

 five feet high. Draco- 

 cephalum Ruyscliianum 

 (hyssop-leaved dragon's- 

 head) is from Europe, and 

 grows from twelve to eigh- 

 teen inches high. It is 

 very showy in summer, 

 bearing purplish-blue flow- 

 ers in closely whorled 

 spikes an inch long. This 

 is the best of the species 

 of dragon's-heads. 



Eryngium (ilpinmn is 

 a very pretty plant two 



feet high, looking some- QA.LLARD.A GRAND.FLORA. 



thing like the thistles at first sight, owing to the peculiar 

 character of the leaves surrounding the usually dense, 

 compact, bluntly spike-like heads of flowers. It blooms 

 in July and August. Euphorbia corollata (flowering 

 spurge) is a tall branching plant two to three feet high, 

 bearing pure white flowers in heads all through July and 

 as late as October. The Gaillardias (especially Gaillardia 



