Segment of an illustration by Henry Holiday (cut by Joseph Swain) in Lewis Carroll's The Hunting of the Snark, 1876

The segment on the lower right side is Charles Darwin's Tree of Evolution or Tree of Life sketch in his 1st notebook, page 36, 1837-1838. I learned, that Darwin did not keep his notebook secret after the publication of On the Origin of Species, but I do not know of any presentation of his sketch before 1876. Thus, the resemblance between the "weed" and Darwin's evolutionary tree sketch propably is purely incidental.

Postprocessing: GIMP perspective transformation tool

Questions:
(1) When did Charles Darwin publish a facsimile of his sketch fo the first time? When (e.g. in lectures etc.) was it presented for the first time?
(2) Or is there a completely different explanation? Holiday's "weed" also could allude to an eagle riding a wild boar.