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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.
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,
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
