Difference between revisions of "Oocephala"

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This page should be cited as follows (rationale):
Robinson H, Skvarla J, Funk V (2016) Vernonieae (Asteraceae) of southern Africa: A generic disposition of the species and a study of their pollen. PhytoKeys (60) : 49–126, doi. Versioned wiki page: 2016-02-11, version 77140, https://species-id.net/w/index.php?title=Oocephala&oldid=77140 , contributors (alphabetical order): Pensoft Publishers.

Citation formats to copy and paste

BibTeX:

@article{Robinson2016PhytoKeys,
author = {Robinson, Harold AND Skvarla, John J. AND Funk, Vicki A.},
journal = {PhytoKeys},
publisher = {Pensoft Publishers},
title = {Vernonieae (Asteraceae) of southern Africa: A generic disposition of the species and a study of their pollen},
year = {2016},
volume = {},
issue = {60},
pages = {49--126},
doi = {10.3897/phytokeys.60.6734},
url = {http://phytokeys.pensoft.net/articles.php?id=6734},
note = {Versioned wiki page: 2016-02-11, version 77140, https://species-id.net/w/index.php?title=Oocephala&oldid=77140 , contributors (alphabetical order): Pensoft Publishers.}

}

RIS/ Endnote:

TY - JOUR
T1 - Vernonieae (Asteraceae) of southern Africa: A generic disposition of the species and a study of their pollen
A1 - Robinson H
A1 - Skvarla J
A1 - Funk V
Y1 - 2016
JF - PhytoKeys
JA -
VL -
IS - 60
UR - http://dx.doi.org/10.3897/phytokeys.60.6734
SP - 49
EP - 126
PB - Pensoft Publishers
M1 - Versioned wiki page: 2016-02-11, version 77140, https://species-id.net/w/index.php?title=Oocephala&oldid=77140 , contributors (alphabetical order): Pensoft Publishers.

M3 - doi:10.3897/phytokeys.60.6734

Wikipedia/ Citizendium:

<ref name="Robinson2016PhytoKeys">{{Citation
| author = Robinson H, Skvarla J, Funk V
| title = Vernonieae (Asteraceae) of southern Africa: A generic disposition of the species and a study of their pollen
| journal = PhytoKeys
| year = 2016
| volume =
| issue = 60
| pages = 49--126
| pmid =
| publisher = Pensoft Publishers
| doi = 10.3897/phytokeys.60.6734
| url = http://phytokeys.pensoft.net/articles.php?id=6734
| pmc =
| accessdate = 2024-12-23

}} Versioned wiki page: 2016-02-11, version 77140, https://species-id.net/w/index.php?title=Oocephala&oldid=77140 , contributors (alphabetical order): Pensoft Publishers.</ref>

See also the citation download page at the journal.


Taxonavigation

Ordo: Asterales
Familia: Asteraceae

Name

Oocephala (S.B. Jones) H. Rob., 1999Wikispecies linkPensoft Profile

Descriptions

Low, much-branched shrubs to 1 m high, stems with L-shaped hairs on multiseptate stalks, cap-cells one-armed. Leaves alternate, sub-sessile, linear to elliptical, sometimes serrate. Inflorescences corymbiform cymes, with usually shortly pedunculate heads or with heads sessile in apical clusters of leaves. Involucre ovoid or cylindrical; bracts 20–40 in 4–7 gradate series, ovate to oblong, appressed; receptacle without pales. Florets ca. 10–15 in a head; corollas white or lavender, tubular to narrowly funnelform, throat as long as lobes, tips without hairs or with few short biseriate hairs; anther bases rounded, apical appendages glabrous, with thin-walled cells; style base with narrow ring; style branches with acicular sweeping hairs. Achenes weakly 8-ribbed, sericeous with many setulae, idioblasts numerous, raphids narrowly elongate; pappus biseriate, outer shorter and broader, inner setiform, subplumose, glabrous near base. Chromosome number unknown.
Pollen 7–8-porate, with pores scattered over the whole surface in lacunae that are usually not adjacent, lophate (Fig. 18 A–F), minutely papillose on muri, nonperforated tectum restricted to muri, emicropunctate, baculae regularly spaced in single row under muri or lophae, baculae subtended by “rhizomate” structure that is as broad as the outer layer, and gives the muri or lophae a two-layed structure with small evenly spaced columellae separating the layers. The rhizomiform base of the muri is weakly attached to the footlayer thus causing muri to easily detach from the core of the grain. Lacunae of exine of pentagons mixed with hexagons. The structure of the bucky ball was a remarkable close approximation of the structure of the pollen. It was study of the toy ball that led to the conclusion that the pollen characteristically had seven or eight pores. Other pollen grains show a somewhat different pattern of pores, where pores occur in pairs, one each in a pair of adjacent lacunae (Fig. 18 B). The polyporate, subspherically symmetrical, rhizomate form of pollen in Oocephala is shared in a somewhat less symmetrical form by Polydora, but as far is currently known, these Oocephala and Polydora grains, with their non-equatorial pores, are unique in the Asteraceae (Robinson and Skvarla 2014[1]). Notable secondary metabolites: sesquiterpene glaucolides (Bohlmann and Jakupovic 1990[2] as Vernonia staeheleinoides Harv.).

Taxon Treatment

  • Robinson, H; Skvarla, J; Funk, V; 2016: Vernonieae (Asteraceae) of southern Africa: A generic disposition of the species and a study of their pollen PhytoKeys, (60): 49-126. doi

Images

Other References

  1. Robinson H, Skvarla J (2014) Pantoporate pollen in the Asteraceae (Vernonieae). Phytokeys 38: 1–13. doi: 10.3897/phytokeys.38.7495
  2. Bohlmann F, Jakupovic J (1990) Progress in the chemistry of the Vernonieae (Compositae). Plant Systematics and Evolution Suppl. 4: 3–43. doi: 10.1007/978-3-7091-6928-5_2