Carrington Falls Grevillea - Grevillea rivularis - endangered NSW species with a very limited population in the wild. I've ended up with several plants in a paddock, presumably seedlings from an old stock plant. Foliage is pretty prickly which is probably why it's rarely seen in nurseries - with many cultivated plants actually x acanthifolia hybrids (like 'Carrington Cross'). G. rivularis is also said to be one part of the well known 'Bronze Rambler' hybrid (crossed with 'Poorinda Peter').
Grevillea macleayana in coastal heathland near Ulladulla, NSW. These coastal forms with mostly entire, elliptic leaves + showy pink/red toothbrush racemes offer a lot of potential as garden plants but don't seem to be as common in nurseries as they were in the 80s/90s when growers still propagated actual species. Generally listed as rare but locally common at Ulladulla and around Jervis Bay.