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Isostigma Less., Linnaea 6: 513 (1831).

Type: not selected. Lectotype (vide L. K. G. Pfeiffer, Nom. 1: 1771. 11 Jun 1875): I. simplicifolium Less.

Reference

Sherff, E. E. (1926). Revision of the genus Isostigma Less. (Contr. Hull Bot. Lab. 346) Bot. Gaz. 81(3): 241257 + pl. 23 & 24.

Key to species

1. Leaves simple; capitula in 34-headed corymbs I. herzogii

Leaves divided, bipinnatisect; capitula solitary 2

2. (1) Ray limb 69 mm long; capitula 2535 mm diam.; leaf segments 0.53 mm wide I. hoffmannii

Ray limb 1825 mm long; capitula 3050 mm diam.; leaf segments 0.20.7 mm wide I. peucedanifolium

*Isostigma herzogii Hassl., Feddes Repert. Spec. Nov. Regni Veg. 7: 358 (1909). Type: Bolivia: Hufig im Kamp von Santiago de Chuquitos, wie Nigritella duftend, Bl. schwartz-rot, ca. 600 m, Mai 1907. Herzog no. 617. Holotype: ?Z (000003585); isotype: ?G.

Bolivia (Santa Cruz).

*Isostigma hoffmannii Kuntze, Revis. Gen. Pl. 3(3): 160 (1898). Type: ''Bolivia: 400 m Rio Yapacani. [Bolivia. Rio Yapacani, 400 m, Jun 1892, Kuntze s.n. according to Wetter & Zanoni, 1985: 333] Holotype: NY; isotype B 2.

Isostigma lorentzii Hieron. ex Sherff, Bot. Gaz. 81(3): 250 (1926), nom. nud. pro syn.

Argentina, Bolivia (Santa Cruz).

Isostigma lorentzii Hieron. ex Sherff, Bot. Gaz. 81(3): 250 (1926), nom. nud. pro syn. = *Isostigma hoffmannii Kuntze

Isostigma megapotamicum (Spreng.) Sherff., Bot. Gaz. 81(3): 252 (1926), comb. superfl. = Isostigma peucedanifolium (Spreng.) Less.

Isostigma peucedanifolium (Spreng.) Less., Linnaea : 514 (1831).

Bidens megapotamicum Spreng., Syst. Veg., ed. 16, 3: 454 (1826). Type: Ad. fl. magnum. Amer. austr. (Rio grande. Sello.) Holotype: P.

Trajoceras peucedanifolium Spreng., Syst. Veg. ed. 16, 3: 576 (1826). Type: Ad fl. magnum. Amer. austr. (Rio grande.) Sello. Holotype: P.

Isostigma megapotamicum (Spreng.) Sherff., Bot. Gaz. 81(3): 252 (1926), comb. superfl.

Bolivia (Santa Cruz), Brazil.

Isotypus Kunth in Humb., Bonpl. & Kunth, Nov. Gen. Sp. Pl. 4 (ed. folio): 8 (1818) = Onoseris Willd.

Iva monophylla Walter, Fl. Carol. : 232 (1788) = Ambrosia artemisiifolia L.