St Aidan's (VC64) is one such place, and as its behind my village it is a good local spot in easy reach from home. Five years in it is still throwing up new plants for me. I spent Sunday afternoon on The Hillside. I hadn't appreciated how many rose species there were up there. Within an hour, and ignoring the undoables, I had Sweet-briar (Rosa rubiginosa), Dog-rose (Rosa canina groups Lutetiana and Transitoriae), Glandular Dog-rose (Rosa squarrosa aka group Dumales), Hairy Dog-rose (Rosa corymbifera aka group Pubescentes), the common hybrid Rosa x dumalis sens. lat. (canina x vosagiaca), Soft Downy-rose (Rosa mollis) which surprisingly had white flowers (but perhaps bleached as pink beneath and in bud) but otherwise (pending fruit) looked typical, and Sherard's Downy-rose (Rosa sherardii). Last two in sequence below.
However, the best was yet to come. I have been waiting for Round-leaved Dog-rose (Rosa obtusifolia) for so long. You really do have to scrutinise and mull every bush to find the goods. Delightfully delicate furry leaves, and white flowers.
Some of the planted and regenerating birches had tiny leaves and originated from further north, completely the wrong form for lowland Leeds. This was Fragrant Downy Birch (Betula pubescens subsp. tortuosa).
Elsewhere the grasslands had Rough Hawk's-beard (Crepis biennis) (terrible photos) and the tussock-form of Red Fescue (Festuca rubra subsp. commutata).
And to end on an orchid, here is one of the many hundreds of Common Spotted x Southern Marsh-orchid (Dactylorhiza x grandis). The orchids are getting better year on year.
Finally, not in St Aidan's but near home (VC63) there was this stunning hybrid ragwort (Senecio x albescens). I must remember to go back and see in flower.