Journal of the Plant Resources Center of the University of Texas at Austin
Number 12 — December 2009
[Published: 25 November 2009]


Contents:

Abutilon ulbrichii, a New Name in Malvaceae
Paul A. Fryxell View Abstract — Download article (28.7 MB)

Iva corbinii (Asteraceae): A Remarkable New Species from Travis County, Texas
Billie L. Turner View Abstract — Download article (13.6 MB)

Taxonomy of Forestiera pubescens and Forestiera neomexicana (Oleaceae)
Guy L. Nesom View Abstract — Download article (1.5 MB)

A New South American subsection of Sida sect. Nelavaga (Malvaceae) with Two New Species
Paul A. Fryxell View Abstract — Download article (15.8 MB)

A New Species of Roldana (Asteraceae) from Southern Oaxaca
Taylor Sultan Quesensley & José Louis Villaseñor View Abstract — Download article (1.4 MB)

Hymenoxys ambigens var. wagneri (Asteraceae: Helenieae: Tetraneurinae), a New Variety in Hymenoxys subgenus Plummera from Arizona
Mark W. Bierner View Abstract — Download article (565 KB)

Abstracts

Abutilon ulbrichii, a New Name in Malvaceae
Paul A. Fryxell
1—4

Abstract: A new name, Abutilon ulbrichii, is proposed to replace the later homonym Abutilon longipes Ulbr. for a South American species (non A. longipes Mattei from Africa).
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Iva corbinii (Asteraceae): A Remarkable New Species from Travis County, Texas
Billie L. Turner
5—7

Abstract: Iva corbinii is described from the Colorado River bottoms of Travis County, Texas, to which it appears restricted. It is a remarkably distinct species, having predominately axillary, single heads; its closest relationship appears to be with I. axillaris, but differs from that taxon by numerous traits, most noteworthy by its involucres, which are composed of non-united bracts, suggesting a primitive position in the genus Iva. A photograph of the type collection is provided, along with a colored picture of its eponymous collector standing amongst a living population of the taxon.
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Taxonomy of Forestiera pubescens and Forestiera neomexicana (Oleaceae)
Guy L. Nesom
8—14

Abstract: Forestiera neomexicana is relatively constant in diagnostic features of vestiture and leaf shape across most of its range in the southwestern USA, from California to New Mexico and into western Texas. Apparent intermediacy in leaf shape and vestiture with F. pubescens, however, as well as glabrous forms of F. pubescens, have complicated identification. The two taxa are treated here as the eastern F. pubescens var. pubescens and the western F. pubescens var. parviflora. The ranges of the two taxa are mapped and variant forms are shown in Texas. Synonymy and typification are provided.
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A New South American subsection of Sida sect. Nelavaga (Malvaceae) with Two New Species
Paul A. Fryxell
15—27

Abstract: Sida [sect. Nelavaga] subsect. Conglomerata is described as a new subsection of the genus, including eight species from South America. Two of the eight are newly described: Sida calva and S. florulenta. The group is characterized by having flowers and fruits borne in axillary glomerules.

Resumen: Se describe como nueva Sida [secc. Nelavaga] subsecc. Conglomerata, incluyendo ocho especies sudamericanas. Dos de las ocho son descritas de nuevo: Sida calva y S. florulenta. El grupo se caracteriza por tener flores y frutos portados en glomérulos axilares.

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A New Species of Roldana (Asteraceae) from Southern Oaxaca
Taylor Sultan Quesensley & José Louis Villaseñor
28—30

Abstract: Roldana uxordecora is described from Oaxaca, Mexico (Muicipio de San Mateo Río Hondo). The genus Roldana is common in the montane regions of the state of Oaxaca (22 species), and this addition to Roldana adds to a list of endemic species, now five, already collected from this montane region.

Resumen: Se describe Roldana uxordecora de Oaxaca, México (Municipio de San Mateo Río Hondo). El genero Roldana es frecuente en las regiones montañosas del estado de Oaxaca (22 especies), y con esta nueva especie, se agrega una más a la lista de especies endémicas, ahora cinco, de las colectadas hasta este momento en esa región montañosa.

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Hymenoxys ambigens var. wagneri (Asteraceae: Helenieae: Tetraneurinae), a New Variety in Hymenoxys subgenus Plummera from Arizona
Mark W. Bierner
31—35

Abstract: Hymenoxys ambigens var. wagneri is a new variety endemic to the Dragoon Mountains of Cochise County, Arizona.
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