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Parthenium L., Sp. Pl. : 988 (1753).

Hysterophorus, Adans. Fam. 2: 128 (1763). Type: no species cited.

Villanova Ortega, Nov. Rar. Pl. Matrit. Dec. 4: 47, t. 6 (1797), nom. rej., non Lag. (1816). Type: Villanova bipinnatifida Ortego = Parthenium bipinnatifidum (Ortega) Rollins

Argyrochaeta Cav., Icon. 4: 54, t. 378 (1798). Type: Argyrochaeta bipinnatifida Cav. = Parthenium bipinnatifidum (Ortega) Rollins

Bolophyta Nutt., Trans. Amer. Philos. Soc. ser. 2, 7: 347 (1840). Type: Bolophyta alpina Nutt. = Parthenium alpinum (Nutt.) Torrey & A. Gray

Echetrosis Phil., Anales Univ. Chil. 43: 504 (1873). [Note: in a separately paginated reprint/preprint in K this appeared on p. 28.] Type: Echetrosis pentasperma Phil. = Parthenium hysterophorus L.

Type: Parthenium hysterophorus L.

References

Cabrera, A. L. (1978). Parthenium. In: A. L. Cabrera (Ed.), Flora de la Provincia de Jujuy, Republica Argentina. Coleccion cientifica Tomo XIII, Parte X Compositae. INTA, Buenos Aires. pp. 331333.

Cabrera, A. L. (1992). Ampliacion del area geografica de Parthenium cineraceum (Compositae). Hickenia 2(15): 6971.

Robinson, H. (2006). Parthenium. In: G. Harling & L. Andersson (eds), Flora of Ecuador, No. 77(1): 190(6). Compositae-Heliantheae, Part 1: Introduction, genera MZ. Botanical Institute, Gteborg University, G teborg & Section for Botany, Riksmuseum, Stockholm. pp. 5154.

Rollins, R. C. (1950). The Guayule rubber plant and its relatives. Contr. Gray Herb. 172: 173 + plate 1.

Key to species

1. Plants shrubs or small trees, 25 m tall; stems densely pubescent, almost felted; leaf margins irregularly crenate to lobed, whitish-grey tomentose beneath; pollen yellow P. cineraceum

Plants herbaceous, annual or perennial, 0.11 m tall; stems hirsute; leaves pinnatisect or bipinnatisect; pollen white2

2. (1) Plants annual; stems erect; capitula in lax corymbiform cymes; upper leaves entire or bilobed with a linear terminal lobe; pedicels and secondary inflorescence branches divaricate, 310 mm long P. hysterophorus

Plants perennial; branches decumbent or ascending; capitula in dense glomerules; upper leaves pinnatisect and smaller than lower; pedicels and inflorescence branches not divaricate, 25 mm long P. glomerulatum

*Parthenium cineraceum Rollins, Contr. Gray Herb. 172: 32 (1950). Type: BOLIVIA: La Cuesta (Calzas), Santa Cruz, prov. Cordillera, 415 meters, Ja. 29, 1945, G. Peredo 98. Holotype: LIL (123899); isotype: GH.

Argentina, Bolivia (Chuquisaca, Santa Cruz), Paraguay.

*Parthenium glomeratum Rollins, Contr. Gray Herb. 172: 59 (1950). Type: BOLIVIA: Escayache bei Tarija, Tarija, Jan. 30, 1904, K. Fiebrig 3017. Holotype: GH; isotypes: F, K, LIL, MO.

Argentina, Bolivia (Tarija).

Paratypes (Bolivian): Bolivian plateau, 1891, Bang 948 (GH, MO).

*Parthenium hysterophorus L., Sp. Pl. : 988 (1753). Type: Habitat in Jamaicae glareosis 0. Lectotype (selected by Stuessy in Woodson & Schery, 1975: 1094): Herb. Linn. No. 1115.1 (LINN).

Parthenium pinnatifidum Stokes, Bot. Mat. Med. 4: 278 (1812), based on Parthenium hysterophorus L.

Argyrochaeta parviflora Cav., Descr. : 233 (1802). Type: Se cria en Cuman: naci de semillas enviadas por el cuidadano Bompland; florecio desde Julio hasta Octubre en el Jardim Botanico. Holotype: ?MA.

Parthenium lobatum Buckley, Proc. Acad. Sci. Philad. 13: 457 (1861)[1862] Type: [USA:] Western Texas. June.[S. B. Buckley] Holotype: ?PH; duplicate material may well be in P-DU.

Echetrosis pentasperma Phil., Anales Univ. Chile 43: 504 (1873)[Note: In a separately paginated reprint/preprint in K this appeared on p. 28.] Type: Se halla en la provincia de Mendoza de la Repblica Arjentina. Pizarro (1960: 140) cited not material in SGO against this name.

Argentina, Belize, Bolivia (Cochabamba, Santa Cruz), Cuba, Ecuador, Guatemala, Mexico, Paraguay, Uruguay, USA, Venezuela, West Indies. Widely adventive in the Old World, including Africa (Kenya), the Mascarenes, China, New Caledonia, etc.

Bolivian citations by Rollins: Coachabamba, Parodi 10223 (GH); same locality, Steinbach 3988 (GH); Santa Cruz, Peredo s.n. (LIL); Buenavista, Santa Cruz, Steinbach 6344 (GH).

Parthenium lobatum Buckley, Proc. Acad. Sci. Philad. 13: 457 (1861)[1862] = Parthenium hysterophorus L.

Parthenium matricaria Gesn. ex Rupr., Fl. Ingr. 1: 583 (1860), nom. illegit. = Tanacetum parthenium (L.) Sch.Bip.

Parthenium pinnatifidum Stokes, Bot. Mat. Med. 4: 278 (1812), nom. illegit., based on Parthenium hysterophorus L. = Parthenium hysterophorus L.

Pascalia baccata (L.) Spreng., Syst. Veg., ed. 16, 3: 602 (1826) = Tilesia baccata (L.f.) Pruski