Checklist of Bolivian Compositae - Royal Botanic Gardens, Kew

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. 331–333.
Cabrera, A. L. (1992). Ampliacion del area geografica de Parthenium cineraceum (Compositae). Hickenia 2(15):
69–71.
Robinson, H. (2006). Parthenium. In: G. Harling & L. Andersson (eds), Flora of Ecuador, No. 77(2): 190(6).
Compositae-Heliantheae, Part II: genera M–Z. Botanical Institute, Göteborg University, Göteborg & Section
for Botany, Riksmuseum, Stockholm. pp. 51–54.
Rollins, R. C. (1950). The Guayule rubber plant and its relatives. Contr. Gray Herb. 172: 1–73 + plate 1.
Key to species
1. Plants shrubs or small trees, 2–5 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, 0.1–1 m tall; stems hirsute; leaves pinnatisect or
bipinnatisect; pollen white 2
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, 3–10
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, 2–5 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
(10912 – fragment of holotype and photo).
Argentina, Bolivia (Chuquisaca, Santa Cruz), Paraguay.
Chaco boreal, bosque chaqueño, steep rocky slopes.
300–2000 m.
December–March.
*Parthenium glomeratum Rollins, Contr. Gray Herb. 172: 59 (1950). Type: ‗BOLIVIA: Escayache bei Tarija,
Tarija, Jan. 30, 1904, K. Fiebrig 3017‘. Holotype: GH (10913); isotypes: ?F, K, LIL, MO.
Argentina, Bolivia (Tarija).
Puna and Prepuna.
2000–3500 m.
December–February.
Paratypes (Bolivian): ‗Bolivian plateau, 1891, Bang 948 (GH, MO).‘
Note: In Zuloaga & Morone (1999) Parthenium glomeratum was listed as a synonym of P. hysterophorus, a
position not accepted in this account.
*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).
Argyrochaeta bipinnatifida Cav., Icon. 4: 54, tab. 378 (1791). Type: ‗Habitat prope Ixmiquilpan oppidum
mexicanum, ubi eam reperit D. Ludovicus Née. Vidi vidam in Regio horto Matiritense florentem mense Iulio
anni 1797. ... Obs. Descriptiones huius plantae et sequentium numeris 417, 418, 432, 435, 437 legi in Regia
Medicinae Academia die 12 Octobris. Eas postea die scilicet 16 Novembris publici iuris fecit Matriti D.
Casimirus Ortega in opusculo cui titulus Novarum aut rariorum plantarum hortii Regii botanici Matritensis
descriptionum decades. Syntypes: ?MA.
Parthenium pinnatifidum Stokes, Bot. Mat. Med. 4: 278 (1812), based on Parthenium hysterophorus L.
Argyrochaeta parviflora Cav., Descr. : 233 (1802). Type: ‗Se cria en Cumaná: nació 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.
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