Most sources (for example space.com, and Wikipedia) seem to agree that they were actually launched on 20 February 1947.
A number (such as answers.com, and this book which I found in Google Books) do say 1946, and on no less a source than NASA itself I found the words "on July 9 and 19, 1946, V–2s carried corn seeds and fruit flies aloft to expose them to cosmic radiation."
I can only conclude that these flights didn't cross the Kármán line – in other words they didn't go into space.
Not that it really matters – it doesn't affect the answer to the question. Why do I bother ... ?!
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