A noun for “branch” in The Shibboleth of Fëanor from 1968 derived from primitive √OLOB (PM/341). It may be a variant of olva “plant”, since lv was sometimes pronounced lb (LotR/1121; PE17/129).
Conceptual Development: The Etymologies of the 1930s had ᴹQ. olwa “branch” derived from primitive ᴹ✶golbā under the root ᴹ√GOLOB (Ety/GÓLOB). The lw in this word seems to be a remnant of Early Qenya phonetic developments, where sometimes lb became lw, the best example being early ᴱQ. elwen vs. Elben “heart” (QL/35; LT2/202). There was a similar word ᴱQ. olwe(n) that was cognate to G. olf(in) “branch, wand, stick” in the Gnomish Lexicon of the 1910s (GL/62), possibly also an example of lb > lw.
A root mentioned in The Shibboleth of Fëanor from the late 1960s serving as the basis for Q. olba of the same meaning (PM/341). Q. olvar “growing things with roots in the earth” from The Silmarillion was probably related (S/45, 345). In The Etymologies of the 1930s, “branch” words were derived from unglossed ᴹ√GOLOB: ᴹQ. olwa and N. golf “branch” (Ety/GÓLOB).
Neo-Eldarin: For purposes of Neo-Eldarin, I would assume √GOLOB is a Sindarin-only variant of √OLOB, perhaps influenced by √GAL “grow”. This would allow us to retain golf = “branch”, though the one name where it appeared, N. Gurtholf “Wand of Death” (Ety/ÑGUR; LR/147), became S. Gurthang “Iron of Death” in later versions of The Silmarillion (S/210).