Pollen morphology, floral microcharacters and taxonomy of the genus<i>Baccharoides</i>Moench (Vernonieae: Asteraceae)

Isawumi, M. A.; El‐Ghazaly, Gamal; Nordenstam, B.

doi:10.1080/00173139609430008

Cited by 23 publications

(24 citation statements)

References 30 publications

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“…Some of these studies, and work of other recent authors, emphasized trichomes (Faust and Jones, 1973;Pope, 1983), underground systems (Menezes et al, 1979); anatomy (Magalhiies and Alencastro, 1973;Alencastro, 1978;Carlquist, 1964;Petriella, 1966), pollen (Stix, 1960;C.E. Smith, 1969;Kingham, 1976;Jones, 1979bJones, , 1981aJones, 1977b, 1979;Bolick, 1983;Isawumi et al, 1996), presence of latex (Lewinsohn,199 l), chromosome numbers (Jones, 1974(Jones, , 1979aKeeley, 1978;Dematteis, 1996), and nomenclatural details (Nicolson, 1991;Jeffrey and Hind, 1994;Grant, 1994). Jones (1977), Harborne and Williams (1977), and Robinson, Bohlmann, and King (1980) presented some early apparent correlations of chemical data with classification or geography, and the extensive subsequent studies of secondary metabolites were summarized by Bohlmann and Jakupovic (1990).…”

Section: Introductionmentioning

confidence: 99%

Generic and subtribal classification of American Vernonieae /

Robinson¹

1999

179

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A B S T R A C TRobinson, Harold. Generic and Subtribal Classification of American Vernonieae. Smithsoniun Contributions to Botany, number 89, 116 pages, 1999.-The Vernonieae in America is herein defined to exclude the Liabeae and Pseudostifftiu (Moquinieae), and to include elements sometimes placed in the Heliantheae (Trichospiru) or Lactuceae (Stokesiu). Pollen, style bases, raphids, inflorescence form, involucre, anther appendage, and chemistry are some characters used in the reclassification. Tables 1-12 indicate the distribution of these characteristics in most American genera. Vernoniu s.s., with type A pollen, is typified by K noveborucensis (L.) and occurs in the Bahamas, eastern North America, south to central Mexico and has two species in temperate South America. All other species previously placed in Vernoniu need to be removed from the genus, a process that is nearly complete for neotropical species. Most American Vernonieae seem to form a single related subgroup in the tribe. Subtribes included in the related subgroup are the Lychnophorinae (x = 15, 17, 18) and Centratherinae (x = 16) with type A pollen and hroheliangolides; Piptocarphinae (x= 17) with type A pollen, deciduous inner involucre, and sometimes opposite leaves; Vernoniinae (x = 17), many with glanduliferous anther appendages (including the Lepiduplou complex mostly with echinolophate pollen); and the newly proposed subtribes Sipolisiinae with type A pollen, armed receptacles, and carbonized achenes; Chrestinae with echinolophate pollen; and Leiboldiinae ( x = 19) with type A pollen, large heads, and a modified callus at the top of the achene. Of uncertain relationship to the preceding related subgroup are Stokesiu (x = 7), the Elephantopodinae (x = 1 1, 13), and the Rolandrinae (x = 8) with echinolophate pollen; three genera with type E pollen (Pucourinu, Acilepidopsis, and Mesunthophoru); and the Trichospirinae with type A pollen and flattened bicornute achenes. Ten subtribes are recognized, plus four unplaced generic groups. Three of the subtribal names, Leiboldiinae, Chrestinae, and Sipolisiinae are validated in the treatment. The genus Cuutingunthus of eastern Brazil, a possible relative of the Elephantopinae, is described as new. A list of the 76 accepted genera of Vernonieae, native or introduced in the New World, is provided, and a complete list of names of American Vernonieae is given with an indication of their present taxonomic dispositions and geographical distributions. Fifteen new combinations are provided.

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Section: Introductionmentioning

confidence: 99%

Generic and subtribal classification of American Vernonieae /

Robinson¹

1999

179

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“…43.5–72.0 μm diam. (Isawumi et al 1996); tricolporate, echinolophate; lacunae regularly disposed, one at each pole, 2 across intercolpus; tectum restricted to muri, with distinct microperforations; stout baculae under muri firmly attached to footlayer (Fig. 3A–I).…”

Section: Resultsmentioning

confidence: 99%

Vernonieae (Asteraceae) of southern Africa: A generic disposition of the species and a study of their pollen

Robinson¹,

Skvarla²,

Funk³

2016

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Current and previously included members of the Tribe Vernonieae (Asteraceae) of southern Africa are listed in their presently recognized genera with complete synonymies and keys to genera and species. The genus Vernonia, as presently delimited, does not occur in Africa. Genera of the Vernonieae presently recognized from southern Africa are Baccharoides, Bothriocline, Cyanthillium, Distephanus, Erlangea, Ethulia, Gymnanthemum, Hilliardiella, Oocephala, Orbivestus, Parapolydora, Polydora, Vernonella, Vernoniastrum, plus two genera that are named as new: Namibithamnus and Pseudopegolettia. Twelve new combinations are provided and two species, Vernonia potamiphila and Vernonia collinii Klatt., hom. illeg., remain unplaced because of a lack of material.Pollen types are illustrated including previously recognized types: non-lophate, sublophate, tricolporate lophate, and non-colpate triporate lophate. A type previously unknown in the Asteraceae is described here and in a separate paper for Oocephala and Polydora; a non-colpate pantoporate lophate type with pores not strictly equatorial.

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“…Endothecial tissue -The thickenings of the endothecial cells are good for delimiting genera (ISAWUMI et al 1996). Three types of endothecial tissues can be easily classified in this study -,,polarized", ,,radial" and ,,intermediate".…”

Section: Taxonomic Microcharactersmentioning

confidence: 92%

“…The degree of pubescence of the corollas varies within the species of a genus. Pubescence of the corollas has been observed in some genera of the Vernonieae, Baccharoides (ISAWUMI 1993(ISAWUMI , 1995aISAWUMI et al 1996), Cyanthillium (ISAWUMI 1995b, Vernonia (ISAWUMI 1995 c).…”

Section: Taxonomic Microcharactersmentioning

confidence: 99%

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Floral microcharacters and taxonomy of the tribe Vernonieae: Asteraceae (excluding Vernonia SCHREB.) in West Africa

Isawumi

1999

Feddes Repertorium

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The tribe Vernonieae in West Africa is treated with about 14 species aligned in 12 genera excluding the genus Vernonia. The genera such as Kinghamia C.JEFFREY, Bothriocline OLIV. ex BENTH. and Pseudelephantopus C.F.BAK. are new records for West Africa. In this work, microcharacters are extensively employed in the generic and specific circumscription and in the keying out of the genera and species.

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Pollen morphology, floral microcharacters and taxonomy of the genusBaccharoidesMoench (Vernonieae: Asteraceae)

Cited by 23 publications

References 30 publications

Generic and subtribal classification of American Vernonieae /

Generic and subtribal classification of American Vernonieae /

Vernonieae (Asteraceae) of southern Africa: A generic disposition of the species and a study of their pollen

Floral microcharacters and taxonomy of the tribe Vernonieae: Asteraceae (excluding Vernonia SCHREB.) in West Africa

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