An important approach (in my 35 years professional field botanist experience) is to go all out to sight all the spp. in a genus and botanical family in your focus region .
In my last 12 years in this wet tropics region (NE. Qld) i have successively focussed on different large botanical plants' families in different periods of years and seasons, and learned every spp. i can in each of these family; for some examples' families of many spp. out of many more families here: Sapindaceae, Annonaceae, Myrtaceae, Lauraceae in part only still (so hard here), Proteaceae, Moraceae (figs), etc. .
The same systematic learning approach then mentored by late Jim Willis, late Don Neale, David Cameron, a bit GWCarr, David Albrecht and so on, i did in the 1980s and 1990s in learning the entire Sand–stone–belt SE Melb. flora there in my late teenage of the late 1980s and first 10 years professionally throighout the 1990s.
In the field these diverse many spp. are not all easy to recognise.
I have to remind everybody that the most experienced botanists including professional field botanists have excellence in skills for identifying plants and occasionally make mis-identifications (I have documented evidences of top botanists mistakes i have assisted them with and they have assisted me much more than again than I them); and in scientific reality have no authority status – the science philosophy fallacy named argumentum ad auctoritate – as we all have humanity (we hope! :) )
In your second photograph when looking at full resolution i can view the laciniate (±) stipules. Enough for confirmation of *Poranthera ericoides* species identification for me.
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