Missing Scripture.—Matthew's commentary on the abode of Joseph, Mary and Jesus at Nazareth, "and he came and dwelt in a city called Nazareth: that it might be fulfilled which was spoken by the prophets, he shall be called a Nazarene" (2:23), with the fact that no such saying of the prophets is found in any of the books contained in the Bible, suggests the certainty of lost scripture. Those who oppose the doctrine of continual revelation between God and His Church, on the ground that the Bible is complete as a collection of sacred scriptures, and that alleged revelation not found therein must therefore be spurious,may profitably take note of the many books not included in the Bible, yet mentioned therein, generally in such a way as to leave no doubt that they were once regarded as authentic. Among these extra-Biblical scriptures, the following may be named; some of them are in existence to-day, and are classed with the Apocrypha; but the greater number are unknown. We read of the Book of the Covenant (Exo. 24:7); Book of the Wars of the Lord (Numb. 21:14); Book of Jasher (Josh. 10:13); Book of the Statutes (1 Sam. 10:25); Book of Enoch (Jude 14); Book of the Acts of Solomon (1 Kings 11:41); Book of Nathan the Prophet, and that of Gad the Seer (1 Chron. 29:29); Book of Ahijah the Shilonite, and visions of Iddo the Seer (2 Chron. 9:29); Book of Shemaiah (2 Chron. 12:15); Story of the Prophet Iddo (2 Chron. 13:22); Book of Jehu (2 Chron. 20:34); the Acts of Uzziah, by Isaiah, the son of Amoz (2 Chron. 26:22); Sayings of the Seers (2 Chron. 33:19); a missing epistle of Paul to the Corinthians (1 Cor. 5:9); a missing epistle to the Ephesians (Eph. 3:3); missing epistle to the Colossians, written from Laodicea (Col. 4:16); a missing epistle of Jude (Jude 3).
I've read the branch 'explanations', but it doesn't seem to imply an area geographically speaking. The reference of branch in these verses is more conclusive to another name for Jesus Christ.
“Jesse was the father of David. Isaiah speaks of the Stem of Jesse, whom he also designates as a branch growing out of the root of that ancient worthy. He recites how the Spirit of the Lord shall rest upon him; how he shall be mighty in judgment; how he shall smite the earth and slay the wicked; and how the lamb and the lion shall lie down together in that day—all of which has reference to the Second Coming and the millennial era thereby ushered in. (Isa. 11.) As to the identity of the Stem of Jesse, the revealed words says: ‘Verily thus saith the Lord: It is Christ.’ (D&C 113:1–2.) This also means that the Branch is Christ, as we shall now see from other related scriptures.
“Through Zechariah the Lord spoke similarly: ‘Thus saith the Lord of hosts: . . . I will bring forth my servant the BRANCH. . . . I will remove the iniquity of the land in one day [meaning that the wicked shall be destroyed and the millennial era of peace and righteousness commence]. In that day, saith the Lord of hosts, shall ye call every man his neighbour under the vine and under the fig tree.’ (Zech. 3:7–10.) Of that glorious millennial day the Lord says also: ‘Behold the man whose name is The BRANCH; and he shall grow up out of his place, and he shall build the temple of the Lord: Even he shall build the temple of the Lord; and he shall bear the glory, and shall sit and rule upon his throne.’ (Zech. 6:12–13.)
“That the Branch of David is Christ is perfectly clear. We shall now see that he is also called David, that he is a new David, an Eternal David, who shall reign forever on the throne of his ancient ancestor. ‘It shall come to pass in that day, saith the Lord of hosts, ‘that is, in the great millennial day of gathering, that ‘they shall serve the Lord their God, and David their king, whom I will raise up unto them.’ (Jer. 30:8–9.)
From the wonderful Jesus the Christ written by Talmage