Taxonomic studies of Australian Senecio (Asteraceae) 5. The S. pinnatifolius/S. lautus complex

Thompson, Ian R.

doi:10.5962/p.291560

Cited by 19 publications

(10 citation statements)

References 9 publications

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“…A complete key to groups, species, and infraspecific taxa in Senecio is presented below following descriptions of groups. The majority of species have recently been described in a series of papers by Thompson (2004aThompson ( , 2004bThompson ( , 2004cThompson ( , 2005aThompson ( , 2005b) and the reader is referred to these for details. Concise descriptions and supplementary notes for species in the Macranthus and Ramosissimus groups and for nine introduced species are presented here, these species not having been described in the aforementioned papers.…”

Section: Tnadagascariensismentioning

confidence: 99%

“…A group of eleven species occurring throughout most of Australia south of latitude 20°S. This group was revised by Thompson (2005b). It has been termed the Lautusoid group because of the similarity of its members to Senecio lautus, now considered a New Zealend endemic.…”

Section: G Lautusoid Groupmentioning

confidence: 99%

“…Belcher (1994) coined the term pseudolautusoid, but to me the prefix "pseudo" is misleading as 1 consider Australian taxa to be closely related to New Zealand taxa. Prior to Walsh (1999) and Thompson (2005b), the name S. lautus had been used for all native Australian species of this group. The introduced species S. madagascariensis, native to southern Africa and Madagascar, is included in this group.…”

Section: G Lautusoid Groupmentioning

confidence: 99%

“…The remaining species are listed. For detailed accounts of these species, the reader is referred to recent papers by Thompson (2004aThompson ( , 2004bThompson ( , 2004cThompson ( , 2004dThompson ( , 2005aThompson ( , 2005b A genus of 18 species predominantly of subantarctic distribution from southern South America, New Zealand, New Guinea, and Australia. Three species in Australia.…”

Section: Introductionmentioning

confidence: 99%

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A taxonomic treatment of tribe Senecioneae (Asteraceae) in Australia

Thompson¹

2006

Muelleria: An Australian Journal of Botany

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A concise taxonomic treatment of the tribe Senecioneae (Asteraceae) in Australia is presented, with descriptions of 39 species from 13 of the 14 genera in the tribe in Australia (Bedfordia is excluded). Keys to all genera and to all species in the tribe are presented, including a key to all species of Senecio in Australia. Also for Settecio, a new, informal subgeneric classification is presented. Taxonomic changes presented include the recognition of Senecio esleri C.J.Webb as an earlier valid name for S. brevitnbiilus I.Thomps., the resurrection of Senecio barkhausioides Turcz., and the recognition of Emilia fosbergii Nicolson as a new alien species. Tribe SENECIONEAE Herbs, shrubs or subshrubs, trees or climbers, sometimes dioecious or gynodioecious, taprooted or not; latex lacking. Hairs mostly eglandular, glandular in Petasites and Bedfordia, not furcate. Leaves mostly alternate, occasionally rosulate, pinnately or palmately veined, not spiny, glandular in Abrotanella and Brachyglottis. Inflorescences terminal, or axillary in Bedfordia. Capitula radiate, disciform or discoid, mostly pedunculate, sessile at first in Abrotanella ; involucre comprising an even-heighted inner series of bracts (phyllaries); phyllaries free or rarely connate, without outgrowths; an outer series of bracts (calycular bracteoles*) present or not; receptacle epaleate, usually ± flat. Florets of radiate capitula: disc florets actinomorphic, bisexual**, or functionally male in Petasites fragrans; ray florets fewer than disc florets, zygomorphic, female, or pistillate but sterile in Petasites fragrans , with corolla-tube mostly glabrous; ligule commonly yellow, but also of other colours, with apex obtuse, 3-lobed. Florets of disciform capitula: central florets actinomorphic, bisexual, or functionally male sometimes in Arrhenechthites; outer florets actinomorphic, or zygomorphic in Arrhenechthites, female, mostly more numerous than central florets. Florets of discoid capitula all actinomorphic. bisexual. Anthers ecalcarate, ecaudate or caudate, with apical appendage ovate, lanceolate or oblong. Style in bisexual florets glabrous or with obtuse hairs; style-branches short to long, not tapering, often penicillate apically, occasionally with a tapering terminal appendage, commonly each with two stigmatic zones. Achenes homomorphic, sometimes mildly dimorphic in Senecio, terete, compressed in Cineraria, with ribs smooth, sometimes with papillose hairs, unbeaked or sometimes short-beaked in Senecio. Pappus homomorphic, absent in Abrotenella, white, pink in Erechtites ; bristles uniform within a pappus, capillary, smooth, scabridulous or barbellate.Notes: *Calycular bracteoles are significantly smaller and less regularly arranged than phyllaries. They arise proximal to the phyllaries, on or just proximal to the common receptacle, and form a variably crowded cluster or "calyx". They are more or less identical in form to the peduncular bracteoles which commonly occur along the peduncle.**The terms female, male and bisexual for florets indicates th...

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Section: Tnadagascariensismentioning

confidence: 99%

Section: G Lautusoid Groupmentioning

confidence: 99%

Section: G Lautusoid Groupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A taxonomic treatment of tribe Senecioneae (Asteraceae) in Australia

Thompson¹

2006

Muelleria: An Australian Journal of Botany

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“…A key to all radiate species is presented in Thompson 2004 and a key to a revised S. Iciiitus/S. pinnatifoliiis complex is presented in Thompson (2005b) 1 Achenes all similar in length; attachment points on receptacle not dimorphic as below; corolla-tube of female florets distinctly longer than the mature achene.…”

Section: Keymentioning

confidence: 99%

Taxonomic studies of Australian Senecio (Asteraceae) 4. A revision of Senecio glossanthus and recognition of an allied species with long ligules

Thompson¹

2005

Muelleria: An Australian Journal of Botany

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A morphological study of the Australian annual daisy Senecio glossanthus (Sond.) Belcher has resulted in the recognition of three new species: S. halopbiliis l.Thomps., S. serratifonnis l.Thomps., and S. productiis l.Thomps. Two new subspecies are also described: S. prodiictus subsp. magniis l.Thomps. and S. serratifonnis subsp. stenophylhis l.Thomps. A further new species, S. condyhis I.TIiomps.. described here, has features in common with the S. glossanthus group but also has some affinity to the Australian S. lautus/S. pinnatifoUus complex. A key, distribution maps and illustrations of the new taxa are presented.

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Environmentally induced development costs underlie fitness tradeoffs

Walter

Wilkinson

Aguirre

et al. 2018

Ecology

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Local adaptation can lead to genotype-by-environment interactions, which can create fitness tradeoffs in alternative environments, and govern the distribution of biodiversity across geographic landscapes. Exploring the ecological circumstances that promote the evolution of fitness tradeoffs requires identifying how natural selection operates and during which ontogenetic stages natural selection is strongest. When organisms disperse to areas outside their natural range, tradeoffs might emerge when organisms struggle to reach key life history stages, or alternatively, die shortly after reaching life history stages if there are greater risks of mortality associated with costs to developing in novel environments. We used multiple populations from four ecotypes of an Australian native wildflower (Senecio pinnatifolius) in reciprocal transplants to explore how fitness tradeoffs arise across ontogeny. We then assessed whether the survival probability for plants from native and foreign populations was contingent on reaching key developmental stages. We found that fitness tradeoffs emerged as ontogeny progressed when native plants were more successful than foreign plants at reaching seedling establishment and maturity. Native and foreign plants that failed to reach seedling establishment died at the same rate, but plants from foreign populations died quicker than native plants after reaching seedling establishment, and died quicker regardless of whether they reached sexual maturity or not. Development rates were similar for native and foreign populations, but changed depending on the environment. Together, our results suggest that natural selection for environment-specific traits early in life history created tradeoffs between contrasting environments. Plants from foreign populations were either unable to develop to seedling establishment, or they suffered increased mortality as a consequence of reaching seedling establishment. The observation of tradeoffs together with environmentally dependent changes in development rate suggest that foreign environments induce organisms to develop at a rate different from their native habitat, incurring consequences for lifetime fitness and population divergence.

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Taxonomic studies of Australian Senecio (Asteraceae) 5. The S. pinnatifolius/S. lautus complex

Cited by 19 publications

References 9 publications

A taxonomic treatment of tribe Senecioneae (Asteraceae) in Australia

A taxonomic treatment of tribe Senecioneae (Asteraceae) in Australia

Taxonomic studies of Australian Senecio (Asteraceae) 4. A revision of Senecio glossanthus and recognition of an allied species with long ligules

Environmentally induced development costs underlie fitness tradeoffs

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