1,720,992 research outputs found
Fig. 3 in A taxonomic revision of the Othonna coronopifolia L. group (Asteraceae: Senecioneae: Othonninae)
No full textFig. 3. Distribution of Othonna pavonia.Published as part of Magoswana, S.L., Boatwright, J.S., Magee, A.R. & Manning, J.C., 2022, A taxonomic revision of the Othonna coronopifolia L. group (Asteraceae: Senecioneae: Othonninae), pp. 604-616 in South African Journal of Botany 149 on page 610, DOI: 10.1016/j.sajb.2022.06.050, http://zenodo.org/record/820032
Fig. 7 in Taxonomy of the small southern African endemic genus Echiostachys Levyns (Boraginaceae: Boraginoideae)
No full textFig. 7. Distribution of Echiostachys spicatus.Published as part of Velani, N., Boatwright, J.S., Magee, A.R. & Manning, J.C., 2023, Taxonomy of the small southern African endemic genus Echiostachys Levyns (Boraginaceae: Boraginoideae), pp. 244-256 in South African Journal of Botany 156 on page 254, DOI: 10.1016/j.sajb.2023.03.019, http://zenodo.org/record/801341
Fig. 6 in A taxonomic revision of the Othonna coronopifolia L. group (Asteraceae: Senecioneae: Othonninae)
No full textFig. 6. Distribution of Othonna ramulosa.Published as part of Magoswana, S.L., Boatwright, J.S., Magee, A.R. & Manning, J.C., 2022, A taxonomic revision of the Othonna coronopifolia L. group (Asteraceae: Senecioneae: Othonninae), pp. 604-616 in South African Journal of Botany 149 on page 612, DOI: 10.1016/j.sajb.2022.06.050, http://zenodo.org/record/820032
Fig. 2 in A taxonomic revision of the Othonna coronopifolia L. group (Asteraceae: Senecioneae: Othonninae)
No full textFig. 2. Vegetative variability in species of the O. coronopifolia group (A1-A3, O. coronopifolia) (A1) showing dwarf plants growing along the coast, obovate-oblong, cuspidatemucronate leaves; (A2) plants with capitula on short-shoots, the peduncle mostly 50̅150 mm long; (A3) larger plants mostly with leaves often irregularly toothed or sometimes 3- pinnatifid, often in axillary tufts and on short-shoots; (B1-B2, O. leptodactyla) showing the linear or narrowly lanceolate leaves with linear lobes; (C1-C2, O. ramulosa) (C1) showing leaves mostly fasciculate on short-shoots, oblanceolate, inflorescence terminal on stem, old peduncles ending in thorns; (C2) leaves elliptic, narrow below and petiole-like, inflorescence on short-shoots along stem; (D1-D2, O. pteronioides) showing the divaricately branched habit, tips developing into thorns, the small oblanceolate-elliptic leaves, inflorescence terminal on stems or on short-shoots; (E1-E3, O. spinecens) showing an inflorescence that is either terminal on stems and then a divaricately branched corymb the peduncles becoming woody and spinescent after flowering, or solitary sub-erect capitula terminal on short-shoots and narrowly oblanceolate leaves; (F, O. pavonia) showing the pinnatisect leaves, an inflorescence of few to several capitula in lax corymbs and deep red to maroon stems when young and 5 ray florets and involucral bracts.Published as part of Magoswana, S.L., Boatwright, J.S., Magee, A.R. & Manning, J.C., 2022, A taxonomic revision of the Othonna coronopifolia L. group (Asteraceae: Senecioneae: Othonninae), pp. 604-616 in South African Journal of Botany 149 on page 608, DOI: 10.1016/j.sajb.2022.06.050, http://zenodo.org/record/820032
Fig. 1 in A taxonomic revision of the Othonna coronopifolia L. group (Asteraceae: Senecioneae: Othonninae)
No full textFig. 1. General morphology of the O. coronopifolia group. A. Habit of O. coronopifolia showing obovate to oblanceolate leaves and capitula with 7 or 8 ray florets; B. Habit of O. leptodactyla showing the linear or narrowly lanceolate leaves and capitula with 7 or 8 ray florets; C1-C2. Habit of O. pteronioides showing the small oblanceolate to elliptic leaves in axillary tufts, the divaricate branches ending in thorns and capitula on short-shoots; D. Habit of O. ramulosa showing the leaves fasciculate on short-shoots and capitula with 7 or 8 ray florets; E. Habit of O. spinescens showing the woody spinescent peduncles, the fasciculate leaves on short-shoots and an involucre with 7 or 8 ray florets; F1-F2 Habit of O. pavonia showing the pinnatisect leaves, the deep red or maroon stems, solitary inflorescence and capitula with 5 ray florets. Photographs: A-E by J. Manning; F1-F2 by L. Magoswana.Published as part of Magoswana, S.L., Boatwright, J.S., Magee, A.R. & Manning, J.C., 2022, A taxonomic revision of the Othonna coronopifolia L. group (Asteraceae: Senecioneae: Othonninae), pp. 604-616 in South African Journal of Botany 149 on page 607, DOI: 10.1016/j.sajb.2022.06.050, http://zenodo.org/record/820032
Systematics of subtribes Athanasiinae and Phymasperminae (Anthemideae, Asteraceae)
No full text>Magister Scientiae - MScThe tribe Anthemideae is a large tribe of the family Asteraceae comprising 111 genera and 1 800 species distributed in Africa, Europe, Asia, and the Northern temperate region, with southern Africa as one of its main centers of diversity, together with Central Asia and the Mediterranean. Ongoing studies have focused on analysing relationships among the southern African subtribes of Anthemideae and the most recent classification recognised fourteen subtribes in which there is a clear biogeographical gradient, with the six southern African subtribes comprising the earliest diverging lineages. The present study focuses on two of these southern African-centred lineages (viz. subtribes Athanasiinae and Phymasperminae). Previous phylogenetic studies of the tribe were based on nuclear nrDNA ITS and plastid cpDNA ndhF sequence data and included only a single representative from each of the genera within the subtribes Athanasiinae and Phymasperminae. The phylogenetic relationships and circumscriptions of the two subtribes have been uncertain and highlighted as being in need of re-assessment, as the monophyly of Athanasiinae is in question and the placement of Phymasperminae differed substantially between nuclear and plastid datasets. The present study aimed at expanding the datasets by including 78 of the 107 (73%) species for these two subtribes based on two nuclear (ITS and ETS) and two plastid (rpl32-trnL and 3’rps16-5’trnK) regions. The resultant nuclear and plastid data were analysed using Maximum Parsimony and Bayesian Inference and the phylogenetic trees used in the reconstruction of morphological characters to assess generic and subtribal relationships of Athanasiinae and Phymasperminae. The phylogenetic analyses of all datasets resolved the previous incongruent position of the subtribe Phymasperminae, consistently recovering the subtribe as sister to Athanasiinae to form a strongly supported monophyletic clade. This relationship between Athanasiinae and Phymasperminae was supported by the following synapomorphies: anthers with polarized endothecial tissues, leaves with secretory cavities and the presence of furanosesquiterpenes. While Phymasperminae could be circumscribed by the cypselas with more than ten ribs and the papillose pericarp, the circumscription of Athanasiinae would be problematic as there were no synapomorphies identified to circumscribe it. Phymasperminae is therefore here subsumed into an expanded Athanasiinae s.l. supported by the anthers with polarized endothecial tissues, leaves with secretory cavities and the presence of furanosesquiterpenes. Generic circumscriptions within the expanded Athanasiinae were also re-assessed and refined based on morphological and phylogenetic data. The circumscription of Phymaspermum Less. is here expanded to include the closely related Gymnopentzia Benth. and Eumorphia DC, while the monotypic genera Asaemia Harv. ex Benth. and Adenoglossa B.Nord. are subsumed within Athanasia L. and Leucoptera B.Nord., respectively. The expanded Phymaspermum s.l. can be recognized by the synapomorphic papillose fruit (either short or long and sometimes also with glandular trichomes) with multiple ribs (10 or more ribs). The previously unplaced genus Inulanthera Källersjö was shown to have a fairly isolated position in all analyses. The nuclear analyses recovered Inulanthera as sister to a broader Athanasiinae - Phymasperminae clade, while in the plastid analyses it was recovered with the Penztiinae - Ursiniinae clade.We therefore describe a new subtribe Inulantherinae S.Akimana, Boatwr. & Magee to accommodate the genus, which can be distinguished from the other subtribes by the tailed anthers, fruits lacking secretory cavities, elongated cells in the ribs and its pappus present as an extension of the cypselas ribs, with each rib extended as a small horn or as a scale. Several taxonomic and nomenclatural changes are implemented here based on the results of the expanded phylogenetic analyses and the morphological reconstructions. New combinations are provided for 9 taxa, two genera are reduced to sectional rank, one new subtribe described and the circumscription of one subtribe expanded
Systematics of subtribes Athanasiinae and Phymasperminae (Anthemideae, Asteraceae)
No full textMagister Scientiae (Biodiversity and Conservation Biology) - MSc (Biodiv and Cons Biol)The tribe Anthemideae is a large tribe of the family Asteraceae comprising 111 genera and 1 800 species distributed in Africa, Europe, Asia, and the Northern temperate region, with southern Africa as one of its main centers of diversity, together with Central Asia and the Mediterranean. Ongoing studies have focused on analysing relationships among the southern African subtribes of Anthemideae and the most recent classification recognised fourteen subtribes in which there is a clear biogeographical gradient, with the six southern African subtribes comprising the earliest diverging lineages. The present study focuses on two of these southern African-centred lineages (viz. subtribes Athanasiinae and Phymasperminae). Previous phylogenetic studies of the tribe were based on nuclear nrDNA ITS and plastid cpDNA ndhF sequence data and included only a single representative from each of the genera within the subtribes Athanasiinae and Phymasperminae.202
Systematics of subtribes Athanasiinae and Phymasperminae (Anthemideae, Asteraceae)
Get PDFMagister Scientiae (Biodiversity and Conservation Biology) - MSc (Biodiv and Cons Biol)The tribe Anthemideae is a large tribe of the family Asteraceae comprising 111 genera and 1 800 species distributed in Africa, Europe, Asia, and the Northern temperate region, with southern Africa as one of its main centers of diversity, together with Central Asia and the Mediterranean. Ongoing studies have focused on analysing relationships among the southern African subtribes of Anthemideae and the most recent classification recognised fourteen subtribes in which there is a clear biogeographical gradient, with the six southern African subtribes comprising the earliest diverging lineages. The present study focuses on two of these southern African-centred lineages (viz. subtribes Athanasiinae and Phymasperminae). Previous phylogenetic studies of the tribe were based on nuclear nrDNA ITS and plastid cpDNA ndhF sequence data and included only a single representative from each of the genera within the subtribes Athanasiinae and Phymasperminae.202
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
- …
