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Ambrosia L., Sp. Pl. : 987 (1753), Gen. Pl. ed. 5: 425 (1754), non Ambrosia sensu Hort. ex Bedevian (1936).

Gaertneria Medik., Phil. Bot. 1: 45 (1789), non Gaertneria Schreb. (1789), nec Gaertneria Retz. (1791), nec Gaertneria Lam. (1791). Type: Ambrosia fruticosa Medik. = Ambrosia arborescens Mill.

Franseria Cav., Ic. Descr. Pl. 2: 78 (1793), nom. cons. Type: Ambrosia ambrosioides Cav.

Hemiambrosia Delpino, Studi Lign. Anem. Comp. Artem. : 16 (1871). Type: Hemiambrosia heterocephala Delpino, nom. illegit. = Ambrosia pumila (Nutt.) A. Gray

Hemixanthidium Delpino, Studi Lign. Anem. Comp. Artem. : 17 (1871). Type: Hemixanthidium paradoxum Delpino, nom. illegit. = Ambrosia acanthicarpa Hook.

Xanthidium Delpino, Studi Lign. Anem. Comp. Artem. : 17 (1871). Type: Xanthidium tenuifolium Delpino, nom. illegit. = Ambrosia confertiflora DC.

Acanthambrosia Rydb., N. Amer. Fl. 33: 22 (1922). Type: Acanthambrosia bryantii (Curran) Rydb., nom. illegit.

Type: Ambrosia maritima L.

References

Payne, W. W. (1964). A re-evaluation of the genus Ambrosia (Compositae). J. Arnold Arbor. 45(4): 401-438.

Payne, W. W. (1966). Notes on the ragweeds of South America with the description of two new species: Ambrosia pannosa and A. parvifolia (Compositae). Brittonia 18(1): 2837.

Robinson, H. (2006). Ambrosia. In: G. Harling & L. Andersson (eds), Flora of Ecuador, No. 77(1): 190(6). Compositae-Heliantheae, Part 1: Introduction, genera AL. Botanical Institute, Gteborg University, G teborg & Section for Botany, Riksmuseum, Stockholm. pp. 3339.

Ambrosia arborescens Mill., Gard. Dict., ed. 8, Ambrosia No. 5 (1768). Type: The fifth sort is a native of Peru, from whence the younger Jussieu sent the seeds to the royal gardens at Paris, and by the generosity of his brother Dr. Barnard de Jussieu, I was favoured with this plant, which has succeeded in the Chelsea garden, whence it annually perfects its seeds. Type: ?BM.

Ambrosia fruticosa Medik., Hist. Comment. Acad. Elect. Theodoro-Palatinae 3: 244 (1775), non Ambrosia fruticosa DC. (1836), nec Franseria fruticosa Phil. (1891). Type: not stated. Note: Payne (1964: 411) commented that the good illustration, along with the description left no doubt as to the identity of Medikus plant, but did not formally lectotypify the name. Robinson (2006: 35) indicated that the lectotype was Medicus pl. 20, but not indicating who lectotypified the name, and it may be sensible to take this as the actual lectotypification unless an earlier one is found.

Xanthium fruticosum L.f., Suppl. Pl. : 418 (1782), based on Ambrosia arborescens Mill.

Ambrosia frutescens Lam., Encycl. 1: 128 (1783), nom. nud. pro syn. (sub Ambrosia arborescens Mill.)

*Franseria artemisioides Willd., Sp. Pl., ed. 5, 4: 378 (1805), based on Xanthium fruticosum L.f., non Ambrosia artemisioides Meyen & Walp. (1843).

Xanthium artemisioides (Willd.) Delpino, Studi Lign. Anem. Comp. Artem. : 18 (1871), comb. illegit., non X. artemisioides Hook. & Arn. (1841).

Gaertneria artemisioides (Willd.) Kuntze, Revis. Gen. Pl. 1: 339 (1891).

*Franseria conwayi Rusby, Bull. New York Bot. Gard. 8(No. 28): 130 (1912). Type: [Bolivia:] Santa Cruz, 5000 ft. alt., Aug. 25, 1902. Alta misa ([R.S. Williams] No. 1464). Holotype: NY; isotype: K.

*Franseria recurva Rusby, Bull. New York Bot. Gard. 8(No. 28): 131 (1912). Type: [Bolivia:] Arequipa, 7500 ft. alt., Aug. 8, 1901 ([R.S. Williams] No. 2527). Holotype: NY.

Bolivia (La Paz, Santa Cruz), Colombia, Peru.

Ambrosia artemisiifolia L., Sp. Pl.: 988 (1753). Type: [USA:] Habitat in Virginia, Pennsylvania. 0. Lectotype (selected by Hind, 1993: 214): Herb. Linn. No. 1114.4 (LINN).

*Ambrosia elatior L., Sp. Pl.: 987 (1753). Type: Habitat in Virginia, Canada 0. Lectotype: (selected by Reveal in Jarvis & Turland 1998: 351): Herb. Linn. No. 1114.3 (LINN).

Iva monophylla Walter, Fl. Carol. : 232 (1788). Type: not cited.

Ambrosia elata Salisb., Prodr.: 175 (1796), nom. illegit. superfl. based on Ambrosia elatior L.

Ambrosia paniculata Michx., Fl. Bor.-Amer. 2: 183 (1803), nom. illegit., superfl. based on Iva monophylla Walter [Hab. a Canada ad Floridam.]

Ambrosia artemisiifolia L. var. elatior (L.) Descourt., Desc. Fl. Ant. 1: 239 (1821).

Ambrosia chilensis Hook. & Arn., J. Bot. 3: 311 (1841). Types: Valparaiso; Cuming, (n. 784). Coquimbo; Macrae. Syntypes: K.

Ambrosia glandulosa Scheele, Linnaea 22(2): 157 (1849). Type: [USA, Texas:] Gesellschaftlich auf nacktem Kalksleingerll im trockenen Flussbette des Cibola, 15 Miles westlich von Neubraunfels. Lindheimer. September. Holotype: B.

Ambrosia artemisiifolia L. var. jamaicensis Griseb., Fl. Brit. W. I. : 370 (1861). Type: νΈ^νΆ'Hab. Jamainca!, McNab, in waste places. Holotype: ?

Ambrosia artemisiifolia L. var. paniculata (Michx.) Blank., Rep. (Annual) Missouri Bot. Gard. 18: 173 (1907).

Ambrosia monophylla (Walter) Rydb., N. Amer. Fl. 33: 17 (1922).

Argentina, Bahamas, Bolivia (?), Cuba, Jamaica. Cabrera (1978) suggested a distribution from USA south to the centre of Argentina

Ambrosia artemisiifolia L. var. elatior (L.) Descourt., Desc. Fl. Ant. 1: 239 (1821) = Ambrosia artemisiifolia L.

Ambrosia artemisiifolia L. var. jamaicensis Griseb., Fl. Brit. W. I. : 370 (1861) = Ambrosia artemisiifolia L.

Ambrosia artemisiifolia L. var. paniculata (Michx.) Blank., Rep. (Annual) Missouri Bot. Gard. 18: 173 (1907) = Ambrosia artemisiifolia L.

Ambrosia chilensis Hook. & Arn., J. Bot. 3: 311 (1841) = Ambrosia artemisiifolia L.

Ambrosia elata Salisb., Prodr.: 175 (1796) = Ambrosia artemisiifolia L.

*Ambrosia elatior L., Sp. Pl. : 987 (1753) = Ambrosia artemisiifolia L.

Ambrosia frutescens Lam., Encycl. 1: 128 (1783), nom. nud. pro syn. = Ambrosia arborescens Mill.

Ambrosia fruticosa Medik., Hist. Comment. Acad. Elect. Theodoro-Palatinae 3: 244 (1775), non Ambrosia fruticosa DC. (1836), nec Franseria fruticosa Phil. (1891) = Ambrosia arborescens Mill.

Ambrosia glandulosa Scheele, Linnaea 22(2): 157 (1849) = Ambrosia artemisiifolia L.

Ambrosia monophylla (Walter) Rydb., N. Amer. Fl. 33: 17 (1922) = Ambrosia artemisiifolia L.

Ambrosia paniculata Michx., Fl. Bor.-Amer. 2: 183 (1803), nom. illegit., superfl. = Ambrosia artemisiifolia L.

Ambrosia tarapacana Phil., Anales Mus. Nac. Chile, Secc. 2, Bot. 8: 50 (1891). Type: [Chile: ] Habitat ad Pica. Note: Pizarro (1960: 131) listed two specimens in SGO, 43648 & 65323.

Bolivia (?), Chile.