A New Species in Trillium subgen. Delostylium (Melanthiaceae, Parideae)

Schilling, Edward E.; Floden, Aaron; Lampley, Jayne; Patrick, Thomas S.; Farmer, Susan Beth

doi:10.11646/phytotaxa.296.3.8

Cited by 3 publications

(4 citation statements)

References 7 publications

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“…For instance, one attribute typically associated with the pedicellate flower type—relatively tall plant stature—is lacking for the G1 pedicellate species T . georgianum , known commonly as the Georgia Dwarf Trillium (Schilling et al., 2017). The short stature of this extremely range‐restricted species may preclude it from obtaining LDD by white‐tailed deer.…”

Section: Discussionmentioning

confidence: 99%

Reproductive traits explain occupancy of predicted distributions in a genus of eastern North American understory herbs

Miller

Papeş

Schilling

et al. 2021

Diversity and Distributions

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Aim: Abiotic, biotic and dispersal factors interact to shape species distributions. At broad geographic extents, abiotic factors are thought to exert the greatest influence on the distribution, while biotic and dispersal factors strongly influence the distribution regionally and locally. We test whether reproductive traits relating to biotic and dispersal factors explain differences between estimated potential and occupied geographic distributions for 21 species of Trillium. Location: Eastern North America.Methods: Fundamental niches and associated predicted suitable distributions were estimated using climate-calibrated ecological niche models. We defined occupied distributions as the intersection between known ranges and predicted suitable areas (PSAs).Proportional occupancy of the predicted suitable distribution (PO) was calculated by dividing the area of the occupied distribution by the PSA. We related reproductive traits (ovule number, seed set, number of seeds/plant, seed mass, adult biomass, flower type: sessile/pedicellate) to PO using beta regression models. AICc was used to assess model fit.Results: There was considerable variation in PO across species (1.1%-96%, mean = 51%). Eighty-five percent of species with PO < 60% were sessile; 88% of species with PO > 60% were pedicellate. The best-fit beta regression (pseudo R 2 = .70) yielded significantly lower PO for sessile-flowered species; ovule number and seed mass were also significant predictors of PO.Main conclusions: Variation in PO among study species can be explained by flower type, ovule number and seed mass-biotic traits related to dispersal ability. We posit that variation in dispersal potential stemming from primary and long-distance dispersers is related to occupancy of the predicted suitable distribution in Trillium. We exemplify a scenario in which life history traits explain why some species are rangerestricted when their close relatives are widespread. Our methodology constitutes a powerful comparative framework that can be applied to diverse biological systems to inform conservation of rare species.

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Section: Discussionmentioning

confidence: 99%

Reproductive traits explain occupancy of predicted distributions in a genus of eastern North American understory herbs

Miller

Papeş

Schilling

et al. 2021

Diversity and Distributions

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“…Sessilium Rafinesque (1830: 97), which is sister to the third pedicellate clade, which is consistent with Gleason's T. catesbaei-type and T. subgen. Delostylium Rafinesque (1830: 97) (Farmer 2007, Schilling et al 2017.…”

Section: Introductionmentioning

confidence: 99%

“…(References:Case 2003, Case & Case 1997, Freeman 1975, Fukuda et al 1996, Gaddy 2008, Liang & Soukup 2000, O'Neill et al 2020, Patrick 1984, Samejima & Samejima 1987, Schilling et al 2013, Schilling et al 2017, Schilling et al 2019, Weakley 2020.TrilliumLinnaeus (1753: 339), nom. cons.Type:-Trillium cernuum L. (1753: 339) Trillium L. subgen.…”

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A revised subgeneric classification of Trillium (Parideae, Melanthiaceae)

et al. 2022

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Results of recent molecular phylogenetic analyses have shown that the previous separation of Trillium into two subgenera based on pedicellate or sessile flowers is untenable. An updated infrageneric classification is presented recognising four subgenera in the genus, consistent with phylogenetic analyses. The three clades of pedicellate-flowered species are recognised here as subgenera: subgen. Trillium, Delostylis and newly named Callipetalon. The fourth, Trillium subgen. Sessilia, includes all sessile-flowered species. Orthographic considerations necessitate corrections to two previously published subgeneric names: Delostylium and Sessilium should be Delostylis and Sessilia.

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Morphometric and Molecular Evidence Delimit Six Species in Clematis reticulata s.l. (Ranunculaceae: Clematis subg. Viorna)

2022

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Abstract— Clematis subgenus Viorna of North America currently consists of 21 species with most of the diversity found in the southeastern United States. Past taxonomic treatments of Clematis subg. Viorna have varied greatly, which has led to unclear species limits across multiple species complexes. Often recognized as a single, polymorphic species with a high degree of ecological amplitude, variation in the Clematis reticulata species complex has previously been attributed to phenotypic plasticity. A combination of herbarium specimen examination and extensive fieldwork led to the formation of seven a priori morphological groups, or hypothesized taxa, in the C. reticulata species complex based on previously used and novel morphological characters. We employ an integrative approach to species delimitation with data from morphometric studies of herbarium and common garden datasets, as well as a phylogeny inferred from ddRADseq. Of the seven hypothesized taxa, six were supported by evidence from morphology and phylogeny with corroborating biogeography and ecology. Recognition of Clematis terminalis sp. nov. renders C. subreticulata comb. nov. paraphyletic. Because of its morphological, ecological, and phenological distinctiveness, it may represent a case of peripheral speciation by isolation. Four new species are recognized: C. arenicola sp. nov., C. cumberlandensis sp. nov., C. ouachitensis sp. nov., and C. terminalis sp. nov. Viorna subreticulata is given a new combination in Clematis and the newly defined C. reticulata s.s. is re-circumscribed. An updated dichotomous key, species descriptions, ecological notes, and distribution maps are provided.

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A New Species in Trillium subgen. Delostylium (Melanthiaceae, Parideae)

Cited by 3 publications

References 7 publications

Reproductive traits explain occupancy of predicted distributions in a genus of eastern North American understory herbs

Reproductive traits explain occupancy of predicted distributions in a genus of eastern North American understory herbs

A revised subgeneric classification of Trillium (Parideae, Melanthiaceae)

Morphometric and Molecular Evidence Delimit Six Species in Clematis reticulata s.l. (Ranunculaceae: Clematis subg. Viorna)

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