This semi-alba is not a 'rarity', but for sure is uncommon; this year the second spike is 'late' in reference to #1 (in the pics). It has a soft perfume, not so strong as in Bifr harrisoniae.
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Oh don't the day seem lank and long, when all goes right, and nothing goes wrong.
And isn't your life extremely flat, when you've nothing whatever to grumble at. W.S. Gilbert