I'm almost certain that it's a cistus. Cistus grows in the natural territory of the hermanns tortoise, and although it does have tannins in it, it should be perfectly safe for your tortoise (but like everything, feed in moderation). The flowers usually are only open for a day or so -- if you Google 'cistus' and click on images you will see some similar flowers (they come in lots of coloured varieties, but usually variations of white/red/pink.
Nina
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