Type: United States. Illinois: Pope Co., Shawnee National Forest, Bell Smith Springs picnic ground, 3 Aug 1998, G. Kline 358D (neotype, here designated: DEK; isoneotypes: CAS, F, MO, NY).
Agrimoniaparviflora DC., Prodromus 588. 1825. Type: United States. "Carolina": without specific location, [about 1798], A. Bose s.n., left specimen on sheet (lectotype, here designated: G-DC, seen in digital photo DEK).
Phenology. Flowering from July to mid-September.
Selected specimens examined. CANADA or United States. Without precise locality, [1812-1832], L. von Schweinitz s.n., right plant on sheet with Todd collection (K).
UNITED STATES. ALABAMA: Autauga Co., Jones Bluff, W shore Alabama R. ca. 4 miles N Jones Bluff Dam, 18 Aug 1982, Gunn 1087 (AUA, UNA). ARKANSAS: Independence Co., jct. of rds. from Lock and Dam #3 to Batesville and Cushman, 11 Aug 1970, Thomas 20449 (AUA, KANU, MO, NYS, RSA, UNA). CONNECTICUT: New London Co., Franklin, hillside below P[k] Lookout, 16 Sep 1908, Woodward s.n. (NEBC). DELAWARE: New Castle Co., along Brandywine Cr. above Wilmington, 31 Aug 1937, Tatnall 3503 (PH). DISTRICT OF COLUMBIA: Washington, in horse pasture, 28 Jul 1893, Boetteher s.n. (CAS). GEORGIA: Cherokee Co., along Jug Cr. 2.5 miles N, 820W of Canton, 260 m, 31 Jul 1948, Duncan 8580 (GA). ILLINOIS: Cook Co., Palos Twp. Swallow Cliff Forest Preserve, SW of jct. of US 45 and IL 83, 22 Aug 1997, Lammer 10290 (F). INDIANA: St. Joseph Co., South Bend, Studebaker's Woods, 11 Sep 1913, Nieuwland 11700 (ND 14445). KANSAS: Cherokee Co., 14 Aug 1897, Clothier 1002 (MO)). KENTUCKY: Crittenden Co., W of Dycusburg, along Cumberland River off Dale Owens Rd., 4 Sep 1990, McKinney 4573 (VDB). LOUISIANA: Lafayette Parish, S side of Lafayette, along Vermillion R. near L. O. Peck Subdivision, 29 Jul 1981, Allen 11198 (NLU). MARYLAND: Talbot Co., Kings Cr., 5.5 miles ENE of Easton, 13 Oct 1957, Earle 5082 (PH). MICHIGAN: Lenawee Co., Adrian Twp. Sect. 12, T6 S, R3E, 21 Aug 1950, Parmelee 1855 (MICH). Mississippi: Lafayette Co., ravine near Tula cemetary 18 miles SE of Oxford, 28 Sep 1963, Pullen 6374 (MISS). Missouri: Howell Co., 4.5 miles W of Willow Springs, along Indian Cr., 17 Jul 1982, Summers 1068 (MO). NEW JERSEY: Salem Co., S of Penton, along tributary to Alloway Cr., 26 Jul 1922, Long 26317 (PH). NEW YORK: Suffolk Co., Long Island, Southold, 5 Sep 1920, Latham 2120 (NYS). NORTH CAROLINA: Pitt Co., Greenville, Green Springs Park, 29 Sep 1956, Wilton s.n. (NCU). OHIo: Greene Co., John Bryan State Park, Yellow Springs, 22 Aug 1935, Demaree 11544 (DS, OS). OKLAHOMA: Delaware Co., 3 miles W of State Line (W of Siloam Springs) and 2.5 miles N, 8 Jul 1948, Waterfall 8220 (TEX). PENNSYLVANIA: York Co., Marietta Reservoir area, 2.5 miles N of Hallam, 21 Aug 1946, Moul 1970 (PH). SOUTH CAROLINA: Lexington Co., Riverbanks Zoo Botanical Garden, Old Saluda Mill Site, 3 Sep 1993, Nelson & Kennemore 14905 (USCH). TENNESSEE: Grundy Co., ca. 5 miles N Palmer, Savage Gulf, 27 Aug 1971, Kral 43684 (MO, VDB). TEXAS: Jasper Co., ca. 2 miles S of Jasper, park beside old hwy., 30 Oct 1969, Correll & Correll 38248-B (LL). VIRGINIA: Grayson Co., Pine Mt., Fox Cr., 620 m, 15 Jun 1892, Britton et al. s.n. (NY). WEST VIRGINIA: Ohio Co., Wheeling, 25 Aug 1878, Guttenberg 751 (CM)
Agrimonia eupatoria 6 parviflora was described by Hooker (1832) from collections made by Todd near Lake Huron in Canada. While both of Todd's specimens from Lake Huron at K are in fact A. gryposepala, the one that occupied a sheet with the Schweinitz collection of A. rostellata resembles that species in its vegetative characteristics. After examining the material at K and de Candolle's Agrimonia collections at G-DC, Gray (Torrey & Gray, 1840) clearly understood A. eupatoria 6 parviflora Hook. to be the same species as A. parviflora DC. It, therefore, seems likely that Hooker also understood his variety as that taxon now recognized as A. rostellata
While at P, Gray annotated the type specimen for Agrimonia striata as a minor variety of A. eupatoria. The plant on the right side of the same herbarium sheet is a collection annotated by Michaux as "an nova species ?". This collection is a specimen of A. rostellata. In Torrey & Gray (1840), A Michaux (1803) is placed as a synonum of A. eupatoria & parviflora. When the taxon was first cited as a species in the American literature, A. striata was the accepted name, as for example, by Britton (1891) & Bricknell (1896). Thus, the taxon now recognized as A. rostellata was mistakenly identified as A.striata until at least 1900 (Robinson, 1900) and sometimes more recently in local floras.
The terminal inflorescence of A. rostellata is usually several branched with a terminal raceme that is usually relatively shorter than that of the other species. This characteristic gives Agrimonia rostellata an appearance in the field that can be recognized with practice. Plants of A. rostellata could be confused with those of A. microcarpa, or plants of A. gryposepala and A. pubescens that also have leaves with five mid-cauline major leaflets interspersed with zero to one minor pair (see Fig. 1). Both A. rostellata and A. gryposepala are merely hirsute whereas the other two species are both hirsute and pubescent to villous. Ascending, hirsute hairs 1 mm long or less on the inflorescence rachis, tuberous roots, and hemispherical mature fruiting hypanthium with two to three rows of bristles distinguish A. rostellata from A. gryposepala.