Off topic question:
The Latin and Romance languages disliked the the letter "K". Why? Because it is a Greek letter?
That might be an interesting question. First of all, one has to see how common the letter K was in written Latin: if its use was not very widespread it doesn't come as a surprise that it just fell out of use in most Romance languages.
All Roman letters were Greek letters, so that's not it.
But the Romans didn't get the alphabet straight from the Greeks. Rome and the area around it were under Etruscan rule at the time, and the Greeks were primarily dealing with Etruscans, so the alphabet was used by Etruscans for a while before the Romans got it. And the Etruscan language appears to have lacked a distinction between voiced and unvoiced plosives. An Etruscan word with a T could also sometimes appear with a D, one with a P could also sometimes appear with a B, and one with a K could also sometimes appear with the letter that represented the sound we now associate with G, although it looked like a C. But instead of randomly switching back & forth indefinitely, they started arbitrarily favoring one letter over the other in each pair, so D, B, and K started getting less & less common (with T being used for both "
t" and "
d", P being used for both "
p" and "
b", and C being used for both "
k" and "
g"), and would probably have disappeared if the Romans hadn't started writing and preserved them. By that time, K had simply gotten farther along in that process of fading away than D or B had, so it was so rare that the Romans hardly thought of it as a letter at all anymore and weren't clear on how it was supposed to be different from C, which had ended up representing both its own original sound "
g" and its counterpart "
k" which the Etruscans considered the same sound. Eventually, the Romans decided that having one letter for both "
g" and "
k" was a bad plan, so they started marking it slightly differently depending on which of its two sounds was intended, thus creating G. But the new symbol got the letter's original sound and the old symbol was assigned a new sound, so C went from "
g" to both "
g" and "
k" to just "
k". (As a result, for any words that only appeared before then, like the name "Caius", we don't know the original pronunciation, which is why it sometimes gets rendered as "Gaius".)
There was an intermediate stage in which, regardless of whether the K/C/Q sound was voiced or not, there might have been some consistency for a while in the use of K before A, C before E and I and consonants, and Q before O and U (because it came from another Greek letter representing "
kʷʰ" back when Greek still had that sound before it shifted to "
pʰ"). This was probably based on the vowels in the letters' names: Kappa, Gimel, and Koppa/Qoppa. But, even before the invention of G, C started gradually taking over from K and Q before A and O, which drove K almost completely out of business, left behind the unique persistent digraph QU, and made C the natural choice as the one to make G out of.
K barely managed to hang on in Latin in just a few rare words with stubborn old spellings lingering from a previous era, and, since they mostly perceived it as a foreign letter, for quoting Greek words that used Kappa. It has that in common with Y, which was used for quoting Greek words containing the letter Upsilon.
Any other sounds you might think of for G and C other than "
g" and "
k", such as the sounds that English also spells with J, CH, or S, are the results of palatalization in later languages.
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Back to the original topic about names for a plant, here's the persimmon page on a website that's full of various languages' words for a bunch of different kinds of plants:
M.M.P.N.D. - Sorting Diospyros names
