Taxonomic Implications of External Pollen Morphology to Vernonia (Compositae) in the West Indies

Keeley, Sterling C.; Jones, Sarah Bruyn

doi:10.1002/j.1537-2197.1977.tb11894.x

Cited by 37 publications

(21 citation statements)

References 11 publications

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“…Additionally, examination by SEM showed thick columellae that were randomly scattered in the ektexine; certainly, these columellae were not caught in the thin sections for TEM. Thick and ramified columellae are common in pollen of Vernonieae, as previously reported (Skvarla et al 1977;Robinson 1999;Skvarla et al 2005), and it was seen in Kingham (1975), Keeley and Jones (1977, 1979), Ferreira Mendonça et al (2007, and Dematteis and Pire (2008), but their combination with a spongy structure has not been previously reported. Additional TEM examinations in a larger number of specimens are necessary to elucidate this ''apparently'' unusual structure.…”

Section: Pollen Morphologysupporting

confidence: 59%

Palynological survey of the subtribe Elephantopinae (Asteraceae, Vernonieae)

Tellerı́a

2012

Plant Syst Evol

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Despite the taxonomic value of pollen morphology within the tribe Vernonieae, a detailed study of the pollen of the subtribe Elephantopinae is still lacking. The pollen morphology of ten species, representing three of the four genera of the subtribe, Elephantopus, Pseudoelephantopus and Orthopappus, was studied with LM, SEM, and TEM. The pollen of all the species studied was found to be echinolophate, although the differences in aperture features and both sculpture and exine structure allowed recognizing two pollen types. The species of Elephantopus (except for E. elongatus) and Pseudoelephantopus share the regular or more or less regular ridges pattern, the colporate condition but with the ectoapertures little developed, and the acaveate exine structure. From the sculpture and the apertures, the pollen of Caatinganthus harleyi was found to be similar to that of Elephantopus and Pseudoelephantopus. The pollen morphology of the monotypic Orthopappus, which is shared with that of E. elongatus, was further investigated for the first time. We found that it differs from that of the other species in having an irregular pattern of ridges, colporate condition but with a welldeveloped ectoapertures, and caveate exine. Additional studies of the exine structure and apertures features, coupled with molecular phylogeny, are needed to understand the evolution of pollen characters and re-evaluate the intergeneric relationships within the tribe.

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Section: Pollen Morphologysupporting

confidence: 59%

Palynological survey of the subtribe Elephantopinae (Asteraceae, Vernonieae)

Tellerı́a

2012

Plant Syst Evol

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“…This is in the lower range of variation in Vernonia (Keeley & Jones, 1977). The pollen of V.fuertesii is, in fact, precisely the form classified as Type A by Keeley and Jones (1977) in their study of West Indian Vernonia. Many Eupatorieae do reach a size of 23-25 ,um, which is the smallest size seen in any other tribe.…”

mentioning

confidence: 80%

An Analysis of the Characters and Relationships of the Tribes Eupatorieae and Vernonieae (Asteraceae)

Robinson¹

1977

Systematic Botany

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“…In the overly broad concept of Gymnanthemum in the first attempt to delimit the genus (Robinson, 1999a), plants with both sublophate (Skvarla et al, 2005) (Type A of Jones [1979Jones [ , 1981 and Keeley & Jones [1977, 1979) and lophate (Blackmore et al, 2009) types of pollen were included. All of the forms of pollen in the genus were tricolporate; there were none of the triporate types that occur in the subtribe Erlangeinae (Keeley & Robinson, 2009).…”

Section: Resultsmentioning

confidence: 99%