268 



THE WONDERS OF VEGETATION, 



tropical division, as he called it, consisting of plants 

 that open at sunrise, and close at sunset ; and a horo- 

 logical division, consisting of flowers that open and 

 close at fixed and invariable hours. It is this last di- 

 vision that forms specially the floral clock. The fol- 

 lowing twenty-four flowers open successively at differ- 

 ent hours of the day and night. 



Midnight. . Large-flowered Cactus . "7 . Cactus grandiflorus. 



1 o'clock. . Lapland Sow Thistle .... Sonchus Lapponicus. 



2 o'clock. . Yellow Goats beard .... Tragopogon luteum. 



3 o'clock. . Great Pieris Pieris magna. 



4 o'clock. . Smooth Hawks beard .... Crepis teclorum. 



5 o'clock. . Day Lily Hcmerocallis fulva. 



6 o'clock. . Shrubby Hawkweed .... Hieracium fruticosum. 



I o'clock. . Sow Thistle Sonchus oleraceus. 



8 o'clock. . Mouse Ear Hieracium pilosella. 



. Pimpernel, or Poor Man's Weath- 

 er glass Ai'ragallis arvensis. 



9 o'clock. . Field Marigold Calendula- arvensis. 



10 o'clock. . Neapolitan Mesembryanthemum Mesembryanthcmum Nea- 



politanum. 



II o'clock. . Lady Eleven o'clock .... Ornithogatum umbellatum. 

 Midday. . Ice Plant Mesembryanthemum crystal- 



linum. 



1 o'clock. . Proliferous Pink Dianthus prolifer. 



2 o'clock. . Hawk- weed Hieracium. 



3 o'clock. . Dandelion Leontodon Taraxacum. 



4 o'clock. . Alyssum Alyssum alystrides. 



5 o'clock. . Evening Primrose (Enothera biennis. 



6 o'clock. . Geranium Geranium triste. 



I o'clock. . Naked-stemmed Poppy . . . Papaver nudicaulis. 



8 o'clock. . Erect Convolvulus Convolvulus rectrus. 



9 o'clock. . Linnsean Convolvulus .... Convolvulus Linnaei. 



10 o'clock. . Purple Ipomea Ipomea purpurea. 



II o'clock. . Night-flowering Catch-fly . . Silene noctiflora. 



Among the flowers that open at a fixed hour, sev- 

 eral do not open again after closing, as the Syrian 

 mallow ; others, like most composite flowers, open 

 again on the following day. 



