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Erigeron lilacinus. A -habit; B -leafy shoot; C -head, view from below; D -head, view from above; Eclose-up of flowers; F -head, longitudinal section. Nuraliev NUR 100f. Photos by M. Nuraliev.
Source publication
We report three species from the family Asteraceae found in Hoang Lien National Park representing new records for Vietnam. Erigeron lilacinus is a new combination that we publish to accommodate the taxon earlier known as Erigeron annuus subsp. lilacinus at species rank. It is a widely distributed weed that, however, has not been reported for Asia u...
Context in source publication
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En este trabajo se estudia la morfología de granos de polen de doce especies de la familia Asteraceae,que involucra los géneros Centaurodendron, Dendroseris, Senecio (=Robinsonia), Erigeron y Taraxacum,provenientes de la flora de las Islas de Juan Fernández, su descripción fue realizada mediantemicroscopio óptico y electrónico de barrido, con el fi...
Citations
... The distribution records of E. annuus and E. philadelphicus were accessed and downloaded from the Center for Agriculture and Bioscience International (CABI, 2022a; CABI, 2022b), the Global Biodiversity Information Facility (GBIF, 2022a; GBIF, 2022b), the China Digital Herbarium (https://www.cvh.ac.cn/, accessed April 2023), and related literature (Zhang et al., 2011b;Fan et al., 2020;Sennikov et al., 2020). We imported all the distribution points collected into ArcGIS, referred to relevant literature, and removed unreasonable data and distribution points with missing environmental data. ...
Introduction
Erigeron philadelphicus and Erigeron annuus are two ecologically destructive invasive plants from the Asteraceae family. Predicting the potential distribution pattern of two invasive alien Erigeron weeds can provide a scientific basis for prevent the further spread of these two weeds in China under climate change.
Methods
Based on historical occurrence datasets and environmental variables, we optimized a MaxEnt model to predict the potential suitable habitats of E. philadelphicus and E. annuus. We also analyzed the shifts of distribution centroids and patterns under climate change scenarios.
Results
The key variables that affect the potential geographical distribution of E. annuus and E. philadelphicus, respectively, are temperature seasonality and precipitation of the driest month. Moreover, topsoil sodicity and topsoil salinity also influence the distribution of E. philadelphicus. Under climate change, the overall suitable habitats for both invasive alien Erigeron weeds are expected to expand. The potential geographical distribution of E. annuus exhibited the highest expansion under the SSP245 climate scenario (medium forcing scenarios), whereas E. philadelphicus had the highest expansion under the SSP126 climate scenario (lower forcing scenarios) globally. The future centroid of E. annuus is projected to shift to higher latitudes specifically from Hubei to Hebei, whereas E. philadelphicus remains concentrated primarily in Hubei Province. The overlapping suitable areas of the two invasive alien Erigeron plants mainly occur in Jiangsu, Zhejiang, Fujian, Jiangxi, Hunan, Guizhou, and Chongqing, within China.
Discussion
Climate change will enable E. annuus to expand into northeastern region and invade Yunnan Province whereas E. philadelphicus was historically the only suitable species. E. annuus demonstrates a greater potential for invasion and expansion under climate change, as it exhibits higher environmental tolerance. The predictive results obtained in this study can serve as a valuable reference for early warning systems and management strategies aimed at controlling the spread of these two invasive plants.
... Although a synopsis of the genus has been made (Jeffrey & Chen 1984), many taxonomic problems are still unresolved, i.e., some partially sympatric sets of similar species need further study to better understand their identities, and the limits of the five series within section Synotis are not very clear (Jeffrey & Chen 1984, Tang 2014. In recent years, many taxonomic, geographic and nomenclatural novelties within the genus have been reported, and the number of its species has increased to ca. 60 in total (Chen 1999, Chen et al. 2011, Joshi et al. 2013, Tang et al. 2013a, b, c, 2014, 2017, Tang 2014, Tang & Yang 2014, Tong et al. 2017, Li et al. 2018, Sennikov et al. 2020, Fei et al. 2020, Li et al. 2020, Liu et al. 2020, Tang & Chen 2021, Zhang et al. 2021 (Fig. 1A) from Nepal without stating a precise locality. As it is very variable in many characters such as the shape of leaves, the size of capitula, the number of phyllaries and ray florets, and especially the color and density of indumentum on stems, abaxial leaves, pedicles and phyllaries (Jeffrey & Chen 1984, Chen 1999, Chen et al. 2011, Tang 2014, Zhang et al. 2021, many names such as Sen. densiflorus Wall. ...
Based on morphological comparisons of specimens and observations of living plants in the field we conclude that the key characters as the color of setae on the abaxial leaf sides and pedicles, and the number of ray florets which Jeffrey and Chen used to distinguish Synotis ionodasys from S. cappa are variable and not reliable, and all the characters of the former species (ferrugineous tomentum, 14-20 ray florets) are not distinct and fall within the variation range of the latter, thus making S. ionodasys conspecific with S. cappa.
... In the protologue, the author compared this species with Syn. austroyunnanensis Jeffrey & Chen (1984: 296) (Fig. 2), a species only occurring in southeastern Yunnan and western Guangxi, China , as well as norther Vietnam (Sennikov et al. 2020), stated that Syn. damiaoshanica is very similar to Syn. austroyunnanensis in habit, but differs by an array of characters such as its much shorter calyculus (ca. ...
Careful examination of herbarium specimens and observation of living plants demonstrated that Synotis damiaoshanica is conspecific with S. guizhouensis and should be merged. Morphological differences of S. guizhouensis and its two most close allies, i.e. S. austroyunnanensis and S. sinica are discussed. Color plates of S. guizhouensis, S. damiaoshanica and S. austroyunnanensis are illustrated, a distribution map and a key to the three species are provided.
Critical species inventories provide primary biodiversity data crucial for biogeographical, ecological, and conservation studies. After six years, a second update to the inventory of the vascular flora native to Italy is presented. It provides details on the occurrence at regional level and, for the first time, floristic data for San Marino. The checklist includes 8,241 species and subspecies, distributed in 1,111 genera and 153 families; 23 taxa are lycophytes, 108 ferns and fern allies, 30 gymnosperms, and 8,080 angiosperms. The species/subspecies endemic to Italy are 1,702, grouped in 71 families and 312 genera. The taxa currently occurring in Italy are 7,591, while 545 taxa have not been confirmed in recent times, 94 are doubtfully occurring in the country, 11 are data deficient, and 236 are reported by mistake and to be excluded at national level. Out of the 545 not confirmed taxa, 28 are considered extinct or possibly extinct.
Based on the evidence of morphology and a comprehensive revision of herbarium collections and field records, the taxonomy of the Erigeron acris group in Murmansk Region, European Russia, is completely revised. Its accepted diversity is increased from 2 to 8 taxa, including putative hybrids. The only native species, E. politus, is distributed in mountainous regions, along sea coasts and in the Kutsa River basin. Five species are alien: E. rigidus (previously confused with E. acris s.str.), E. acris s.str. (first recorded in the narrow taxonomic definition), E. brachycephalus (previously unrecorded), E. droebachiensis and E. uralensis (previously reported in error). Two major waves of the introduction of alien taxa are discovered, with different occurrences and species compositions. Regional and local dispersal by pomors (historical Russian settlers) occurred during their colonisation and traditional activities since the 12th century (archaeophytes or early neophytes); such alien taxa (E. rigidus, E. brachycephalus, and partly E. acris) are particularly common within the territory traditionally settled by Russian colonists but also found elsewhere along historical trade routes. Other alien species of the E. acris group (E. droebachiensis, E. uralensis, and partly E. acris and E. brachycephalus) colonised industrial areas in the 1960s–1990s as seed contaminants introduced during revegetation of slag dumps, stockyards, dams and channels. Putative hybrids between E. politus (native), E. rigidus and E. acris (aliens) are found in the places of co-occurrence. Updated nomenclature, synonymy and descriptions are provided for all accepted taxa.
National checklists of alien plants and detailed databases of non-native plant occurrences are required to study and control regional and global plant invasions. No country in Central Asia has a national checklist of alien plants. A recent inventory counted 183 alien plant species in Kyrgyzstan, including archaeophytes and neophytes, established and casual. This preliminary checklist, which was developed for the Global Register of Introduced and Invasive Species in 2018, served as a starting point for the present study.
A complete inventory of Xanthium in Kyrgyzstan has revealed that three alien species are resident in the country. Their correct nomenclature is X. orientale (syn. X. albinum , X. californicum , X. sibiricum auct.; invasive neophyle of the period of extensive grain import to the USSR after the Second World War), X. spinosum (invasive neophyte of the period of the Second World War, which arrived as a contaminant on the relocated livestock) and X. strumarium (syn. X. chinense , X. sibiricum ; archaeophyte of the Neolithic period, introduced with wheat cultivation, which had lost its invasive status and appeared on the verge of extinction when its pool was no longer renewed by contaminated grain). A history of introduction to Central Asia is uncovered for all the species of Xanthium . A further spread is documented for Bunias orientalis , with a new record extending its distribution to the Eastern Tian-Shan; a complex history of its introduction to Europe and Central Asia is inferred from the archaeological data and its recent dispersal, and the pathways of its introduction to Kyrgyzstan are established. Erigeron annuus s.str. is reported as new to Kyrgyzstan and Uzbekistan, and E. lilacinus as new to Kyrgyzstan, Uzbekistan, Kazakhstan, Nepal and Tajikistan (it was previously recorded as E. annuus s.l. from the three latter countries, in which the presence of E. annuus s.str. is not confirmed). These closely related species differ in their pathways of introduction and invasion status: E. annuus s.str. is an invasive established alien which was imported as a contaminant of forage, whereas E. lilacinus is mostly a casual (locally persisting) alien introduced with contaminated seed of ornamental plants or nursery material, and also intentionally introduced and locally established in the Botanical Garden in Bishkek. Bidens tinctoria (syn. Coreopsis tinctoria ) is newly recorded as a casual alien from a single locality in Kyrgyzstan; this species name is validly published here in conformity with the phylogeny of Coreopsideae.
Point maps of species distributions in Kyrgyzstan are provided on the basis of a complete inventory of the literature data, herbarium specimens and documented observations, and our recent fieldwork. The maps are documented with a dataset of herbarium specimens and observations. Period and pathways of introduction, vectors of dispersal, current and historical invasion status, evidence of impact and distributional trend are established or inferred for each species. Each species is discussed in the context of plant invasions in Central Asia as a whole.
These species accounts are part of the national database of alien plants which aims at producing a comprehensive overview and analysis of plant invasions in Kyrgyzstan.
