Nature quiz, answers are wild flowers, clues are cryptic

[Pebbles]

Small flowers but they're big when arranged (9)

Back in very quietly when little digger returns (10)

Debatable why upset when losing B, eh! (9)

Thank you.

[hippocampus]

First one is eyebright (anagram of they're big)

[Pebbles]

Thanks, impressed with the speed :-)

[hippocampus]

Not so fast this time but the second one is nipplewort.

(in backwards, pp and trowel backwards)

[Pebbles]

still very impressive, would never of got that, never heard of it, sounds painful to me !!!

[hippocampus]

...and me.

[poodledoo]

can't tell you the last answer, but I do know the answer starts with the letter T. might be an anagram of debatable + y minus the letter b.

[hippocampus]

Got it! The answer's Twayblade
Anagram of "debatable why" without b and eh

[Pebbles]

Very very impressed hippocampus, thank you again.

How you doing with the rest of the quiz poodledoo, I have nearly found all the trees in the story.

[poodledoo]

I've got the trees Pebbles, but part six (vertebrate/invertebrate mixture) Borrow thin mare has been driving me mad all weekend! Can you help?
Thanks.

[Pebbles]

poodledoo, if I tell you one of them is Robin, you should be able to see the other, if not, let me know. Have you got the "Elected Abe" one?

Got 35 trees, so a few still hiding.

[poodledoo]

Got it Pebbles ! thank you. If I tell you that the vertebrate is a fish beginning with "d", and the invertebrate is an insect, I am sure you can work it out for yourself, without us giving the answer away to everyone else! Happy puzzling and keep searching for the trees!

[Pebbles]

Thanks poodledoo, I had the insect but didn't realise there was a fish called that.