Even though this flower has 3 carpels I can see, I have confirmed monogyna. Don photographed and we collected a plant at Bomaderry Reserve north of Nowra that also had 3 carpels, and the herbarium here in Canberra IDd it as monogyna. The Vicflora key only mentions the number of carpels at couplet 1, and then as the general group with 3 carpels, rarely 1-5. However, at a later couplet, it states the leaves are stem-clasping. I do not think these are. The other half of that couplet asks about star-shaped hairs on the branches. None of the photos are clear enough to determine that. Hibbertias are an extremely difficult group, even in the hand, a lot of the IDing being based on the presence/absence of star-shaped or simple hairs. In photos that means an excellent closeup or a high resolution photo of a leaf, stem, sepals, and/or ovary.
The obtusifolia group usually has 30-40 stamens, not about 12, as this flower has.
Thanks Betty. We have a large number of these currently in flower. As far as I can see, most have three carpels and a dozen or so stamens. I'll try to get better photos. For reasons best known to itself, my camera has difficulty focussing on yellow!
It would be worthwhile for you to collect and press a couple of specimens in flower together with a reasonable bit of stem and take them to the botanic gardens for ID. The usual size of a pressed specimen fits the size of a tabloid newspaper. I used to use about 5 sheets of the Canberra Chronicle on each side in my plant press. Otherwise a specimen that fits your biggest heavy book makes a good pressed specimen. Unless you have a really good camera these days, a phone usually takes better photos.
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