Pictures for the year 2012 are here: http://arctangent.smugmug.com/Nature/Vegetation/2012-Gardens/23961658_HstTWN . . .They will be collected to this gallery at the end of the year.
This gallery is for photos of flowers found in outdoor domestic or public gardens, and of the garden settings in which I found them. Pictures of botanical gardens that are place specific, landscape type pictures are in my 'Places - by type' category http://arctangent.smugmug.com/Places-By-Type/Arboretums-and-Botanical )

Whenever I feel confident of the identify of a flower (as from an accompanying label in a botanical garden, etc.) I've included that information. If I'm clueless about the identify, I usually say so, and I solicit the viewers' help in correcting these deficiencies.

As of now, lilies, dahlias, and peonies have separate galleries, as do orchids (in the Cyber Conservatory). For other flower pictures, please visit my other galleries, of which the following are a few examples:
Wildflowers http://arctangent.smugmug.com/Nature/Vegetation/Wildflowers/5424475_QmrpZJ
Aquatic plants http://arctangent.smugmug.com/Nature/Vegetation/Aquatic-plants/6743500_vkR3KP
Hothouse plants - http://arctangent.smugmug.com/Nature/Vegetation/Hothouse-plants-and-flowers/7376154_D4X7VL