About a week ago what is left of the natural landscape in Ottawa--and a number of lawns that have been let to run riot--gave over to the annual dandelion pride.  Dent de lion .  The teeth of a lion bite a place for themselves and parade their yellow banner for a week before exploding into puff balls of parachuting seeds. But even before the seeds have blown to their new homes, their place on urban hills is taken by ever so slightly more respectable daisies that open most precociously at dawn.  Daes eag .  Day's eye.  A suitable opening for a near Summer's day. Now these are honest bloomers--not sophisticated with heavy petals like potted mums. These showboaters of Summer overshadow their fleabane or aster cousins, who compete, blinking their eyelash petals when the sun is done, bundled in a royal mauve or a flirtatious pink. Also showing now are the heroes of the hedgerow, the bluebells or foxglove from which we have derived the heart medication digi...