Where does “Kreuzdorngewächs” come from?

Kreuzdorngewächs (German) comes from German Kreuzdorn, from German Kreuz, from Spanish Cruz, from Portuguese cruz, from Italian croce, from Latin crux, from Proto-Italic *kruks, from Proto-Indo-European sḱer- — to caw, crow.

Kreuzdorngewächs (German): buckthorn plant

Definitions

buckthorn plant

Ancestry of “Kreuzdorngewächs”, step by step

Kreuzdorngewächs traces back through two separate lines of ancestry.

via German Kreuzdorn

Step	Language	Word	Meaning
1	German	Kreuzdorn	buckthorn
2	German	Kreuz	cross; clubs; sharp
3	Spanish	Cruz	cross
4	Portuguese	cruz	cross
5	Italian	croce	cross
6	Latin	crux	wooden frame on which criminals were crucified,...
7	Proto-Italic	*kruks	—
8	Proto-Indo-European	sḱer-	to caw, crow

via German Gewächs

Step	Language	Word	Meaning
1	German	Gewächs	plant
2	German	wachsen	to grow; to grow, to increase; to wax
3	Middle High German	wahsen	to grow
4	Old High German	wahsan	to grow
5	Proto-West Germanic	wahsan	to grow
6	Proto-Germanic	wahsijaną	to grow
7	Indo-European	*h₂weks-	—

Every word from Proto-Indo-European sḱer- →Every word from Proto-Italic *kruks →Every word from Latin crux →