In addition to what Shari wrote,Vienna Groce is listed in the 1880 Census Howell Co, MO, Howell Twp, ED 51, pg 34 which was enumerated June 6th, 1880.
230/237 GROSE, Pleasant 62 KY,--,--
Cintha 52 TN,VA.VA
Heber 23 KY,KY,TN
Vie 21 KY,KY,TN
John 14 IL,KY,TN
Mary 10 IL, KY,TN
Martha 10 IL, KY,TN
LEE, James 17 IL, KY,KY Servant
Pleasant and Cynthia are also listed in the 1900 Howell Co Census at age 82 and 72 respectively having been married 40 yrs.
Pleasant died 2-6-1904 in Gunter Valley, Howell Co, MO, leaving a wife and 11 children. Two of his sons were W.M. and G.H (prob R.H.not G.H.) Groce living in West Plains at the time of Mr. Groce's death.
From "Peace Valley, Then & Now" a book by Madge Leach from which Research Volunteers on Howell Co GenWeb Site may still be doing lookups, there is some additional information on Vienna Groce Heard: (1859-1926), and on the Heard family which Vienna married into. Unfortunately I do not have it so can't pass it on to you. Hope you can find it, though.