I was very glad to see your posting here. Finding new cousins is always a thrill. I have all the individuals you mention in my TREAT database. A portion of that database is available online at:
Please, look over the information. I'd love to here of any additions/corrections you might see. I was especially glad to see the death date for Huldah TREAT BARKER ROWLAND in your message. I've been looking for that information for some time. Are you willing to share your souce documentation with me? I had heard Huldah had lived in MO during her final years, but could never prove it.
The ROWLANDs and TREATs seem to have intermarried several times. Here's what I mean. The following ROWLAND siblings married these TREAT family members:
Elizabeth ROWLAND (1822-1903) m. Richard TREAT (1815-1895 William ROWLAND (ca1826-??) m. Cynthia Jane HALL (1828-???) [a daughter of Hannah TREAT] Preston Burton ROWLAND (1828-ca1905) m. Huldah TREAT BARKER (1824-1911)
In addition to these, several descendants of this ROWLAND and TREAT family intermarried in later generations.
Hope some of this is helpful to you and I hope to hear from you soon.