Brickellia jimenezii (Asteraceae, Eupatorieae), a New Species from Guerrero, Mexico

2010·3 MB·English

by  Oscar Hinojosa Espinosa

Brickellia jimenezii (Asteraceae, Eupatorieae), a New Species from
Guerrero, Mexico
Oscar Hinojosa Espinosa and Ramiro Cruz Duran
Departamento de Biologfa Comparada, Facultad de Ciencias, Universidad Nacional Autonoma
de Mexico, Apartado Postal 70-399, Delegacion Coyoacan 04510, Mexico, D.F., Mexico.
[email protected]
Abstract. The new species Brickellia jimenezii chromosome number of x = 9 (King & Robinson,
Hinojosa & Cruz Duran (Asteraceae, Eupatorieae) is 1987; Turner, 1997).
described from Guerrero, Mexico. It belongs to the
Barroetea A. Gray complex within Brickellia Elliot, (.B. laxiflora (Brandegee) B. L. Turner, B. pavonii (A.
Gray) B. L. Turner, B. problematica B. L. Turner, B.
The new species presents heads with more florets ([45 sonorana B. L. Turner, and B. subuligera (Schauer) B.
to]74 to 106 vs. 30 to 50 in B. subuligera), larger style L. Turner) are referred to as the Barroetea complex.
branches and anthers (to 3.7 mm and 2.1 mm,
respectively, vs. to 2 mm and to 1.3 mm, respectively, Brickellia by its herbaceous habit with tap roots,
in B. subuligera), as well as cypselae with four well-
defined ribs on each face (vs. none or two on the cuspidate tips (but callose in B. problematica), and
tangentially compressed cypselae with four to six ribs.
subuligera). A key to this species complex and an Formerly, this group of species (except B. sonorana)
dlustration of the new species are provided. had been recognized as the genus Barroetea A. Gray;
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n1u0e6v vas .p r3e0s ean t5a0 c aebne Bzu. esluabsu cliogne rma)a,s rfalmoraess d([e4l 5e ast]i7lo4 ya tBioansisn oinf Gthuee rBrearorr,o Meteeax iccoo, msepvleexra lo df isBtirniccktievleli ac owlleecr¬e
arenstpeeracsti vmamase ntger,a vnsd.e sh as(thaa s2t am m3. 7y 1m.3m m my , 2r.e1s pemcmti-, complex in having larger heads with up to 106 flowers
vcuamatreon tec, osetnil laBs. sbuibenu ligdeerfain),i daassi ecnom coa dcaip slealdaos c(vosn. postulated to be a new species.
interior en B. subuligera). Se proporcionan una clave Brickellia jimenezii Hinojosa & Cruz Duran, sp.
para este complejo de especies y una ilustracion de la nov. TYPE: Mexico. Guerrero: Mpio. Copalillo,
3.12 km al E de Papalutla, 18°1'4.8"N,
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The large genus Brickellia Elliot contains about 90
3, most restricted to the western United States,
> (King & Robinson, 1987; Turner, 1997). The Annual herbs with tap roots, erect, 0.18-0.8 m high;
genus is characterized by its graduate involucres, stems terete, branched above, puberulent, brown to
tubular corollas with small lobes, styles with enlarged reddish purple. Leaves opposite and decussate (the
basal nodes, cypselae with eight to 10 ribs, pappus
bristles with flattened outer surfaces, and a base bracts), simple, at least the lower petiolate; blades
doi: 10.3417/2008032 Novon 20: 43^6. Published on 18 March 2010.
Novon
1.2-4.5 X 0.9-2.5 cm, c