<i>Haptanthus</i> story: Rediscovery of enigmatic flowering plant from Honduras

Shipunov, Alexey; Shipunova, Ekaterina

doi:10.3732/ajb.1000307

Cited by 10 publications

(11 citation statements)

References 8 publications

(12 reference statements)

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“…Didymeles and Haptanthus form two earliest lineages sister to the remainder of Buxaceae. The analyses resulted in an equivocal placement of Haptanthus and Didymeles, which is in agreement with the earlier analyses (Shipunov & Shipunova, 2011). This instability versus the stability of Buxaceae sensu lato provides an indirect support of the integrity of the whole group.…”

Section: Didymeles and Haptanthussupporting

confidence: 86%

Not out of the box: phylogeny of the broadly sampled Buxaceae

Shipunov

Lee

Choi

et al. 2020

Preprint

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The Buxaceae constitute a morphologically diverse phylogenetic lineage of six genera, which includes about 140 species. The most well-known genera are Buxus, Sarcococca, and Pachysandra. Few species of woody Styloceras grow on mid-elevations in the Andes mountains region. Didymeles, with three species endemic to Madagascar, and the monotypic Haptanthus from Honduras, are the most unusual members of the group. The infra-familial classification of Buxaceae is controversial, and molecular data about many species, especially Old World, is still lacking. We used broad taxonomic sampling and molecular data from four chloroplast markers, and the nuclear ribosomal ITS to estimate their phylogeny. These data provide phylogenetic placements of 50 species and enabled better estimates of boundaries in Buxaceae. We described two subfamilies, one monotypic genus, two Buxus subgenera, and one new species of Didymeles from Madagascar.

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Section: Didymeles and Haptanthussupporting

confidence: 86%

Not out of the box: phylogeny of the broadly sampled Buxaceae

Shipunov

Lee

Choi

et al. 2020

Preprint

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“…As fairly widespread among early‐branching eudicots, Haptanthus has unisexual flowers without a prominent perianth, double‐crested and widely decurrent stigmas with unicellular distinct stigmatic papillae, vascularization of each carpel by a dorsal and two main lateral bundles and crassinucellar, anatropous, bitegmic ovules with a thick outer and a thin inner integument (Endress, ; Drinnan et al ., ; Douglas & Tucker, 1996a, b; Endress & Igersheim, ; von Balthazar & Endress, ; von Balthazar, Schatz & Endress, ; Doust & Stevens, ). A phylogenetic position of Haptanthus among Buxaceae was suggested by molecular phylogenetic analyses (Shipunov & Shipunova, ). In the following, we therefore compare inflorescence and floral structure in detail with Buxales and, to some extent, also with other early‐branching eudicots.…”

Section: Discussionmentioning

confidence: 99%

“…However, a recent expedition was successful in finding the plant in new locations, which made the extraction of DNA and the sequencing of the barcoding region of the plastid rbcL gene possible (for details, see Shipunov & Shipunova, ). The subsequent phylogenetic analyses provided reliable support for the placement of Haptanthus Goldberg & C.Nelson in Buxaceae among early‐branching eudicots (Shipunov & Shipunova, ), and this placement helped in the understanding of some features of the peculiar reproductive structures of Haptanthus . Malagasy Didymeles Thou.…”

Section: Introductionmentioning

confidence: 99%

Inflorescence and floral morphology ofHaptanthus hazlettii(Buxaceae, Buxales)

et al. 2015

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The enigmatic Central American tree Haptanthus hazlettii has recently been placed in Buxaceae (Buxales) by molecular evidence. However, Haptanthus appears morphologically to be fundamentally different from other Buxales in having pluriovular carpels with parietal placentation and reduced male reproductive units of an obscure morphological nature. The latter have been interpreted to be pairs of unistaminate flowers, or single flowers, either bearing two stamens or a pair of phyllomes with adnate introrse anthers. We (re‐)investigated the structure of the inflorescences and flowers of Haptanthus in order to clarify their homologies with reproductive structures of Buxales. We found that, despite some distinctive traits of flower morphology, Haptanthus shares many floral characters, including the opposite and pairwise arrangement of floral organs and the fusion between perianth members and stamens, with some Buxales and other early‐branching eudicots. The plicate and pluriovular gynoecium of Haptanthus may be the result of a drastic elongation of the symplicate zone, accompanied by an increase in ovule number, and is thus a derived trait in Buxales. The anther‐bearing structures are phyllomes with adnate anthers rather than stamens or unistaminate flowers. © 2015 The Linnean Society of London, Botanical Journal of the Linnean Society, 2015, 179, 190–200.

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“…In Buxales, we broaden the limits of Buxaceae to include Haptanthaceae (Buxaceae already included Didymelaceae in APG III, ). Shipunov & Shipunova () found that Haptanthus Goldberg & C.Nelson was embedded in Buxaceae, possibly sister to Buxus L., so its inclusion in that family is indicated.…”

Section: Eudicotsmentioning

confidence: 99%

An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG IV

2016

Bot. J. Linn. Soc.

4,795

771

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An update of the Angiosperm Phylogeny Group (APG) classification of the orders and families of angiosperms is presented. Several new orders are recognized: Boraginales, Dilleniales, Icacinales, Metteniusiales and Vahliales. This brings the total number of orders and families recognized in the APG system to 64 and 416, respectively. We propose two additional informal major clades, superrosids and superasterids, that each comprise the additional orders that are included in the larger clades dominated by the rosids and asterids. Families that made up potentially monofamilial orders, Dasypogonaceae and Sabiaceae, are instead referred to Arecales and Proteales, respectively. Two parasitic families formerly of uncertain positions are now placed: Cynomoriaceae in Saxifragales and Apodanthaceae in Cucurbitales. Although there is evidence that some families recognized in APG III are not monophyletic, we make no changes in Dioscoreales and Santalales relative to APG III and leave some genera in Lamiales unplaced (e.g. Peltanthera). These changes in familial circumscription and recognition have all resulted from new results published since APG III, except for some changes simply due to nomenclatural issues, which include substituting Asphodelaceae for Xanthorrhoeaceae (Asparagales) and Francoaceae for Melianthaceae (Geraniales); however, in Francoaceae we also include Bersamaceae, Ledocarpaceae, Rhynchothecaceae and Vivianiaceae. Other changes to family limits are not drastic or numerous and are mostly focused on some members of the lamiids, especially the former Icacinaceae that have long been problematic with several genera moved to the formerly monogeneric Metteniusaceae, but minor changes in circumscription include Aristolochiaceae (now including Lactoridaceae and Hydnoraceae; Aristolochiales), Maundiaceae (removed from Juncaginaceae; Alismatales), Restionaceae (now re‐including Anarthriaceae and Centrolepidaceae; Poales), Buxaceae (now including Haptanthaceae; Buxales), Peraceae (split from Euphorbiaceae; Malpighiales), recognition of Petenaeaceae (Huerteales), Kewaceae, Limeaceae, Macarthuriaceae and Microteaceae (all Caryophyllales), Petiveriaceae split from Phytolaccaceae (Caryophyllales), changes to the generic composition of Ixonanthaceae and Irvingiaceae (with transfer of Allantospermum from the former to the latter; Malpighiales), transfer of Pakaraimaea (formerly Dipterocarpaceae) to Cistaceae (Malvales), transfer of Borthwickia, Forchhammeria, Stixis and Tirania (formerly all Capparaceae) to Resedaceae (Brassicales), Nyssaceae split from Cornaceae (Cornales), Pteleocarpa moved to Gelsemiaceae (Gentianales), changes to the generic composition of Gesneriaceae (Sanango moved from Loganiaceae) and Orobanchaceae (now including Lindenbergiaceae and Rehmanniaceae) and recognition of Mazaceae distinct from Phrymaceae (all Lamiales).

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Haptanthus story: Rediscovery of enigmatic flowering plant from Honduras

Abstract: We obtained phylogenetic trees with reliable support for the placement of Haptanthus as a new member of Buxaceae (boxwood family).

Cited by 10 publications

References 8 publications

Not out of the box: phylogeny of the broadly sampled Buxaceae

Not out of the box: phylogeny of the broadly sampled Buxaceae

Inflorescence and floral morphology ofHaptanthus hazlettii(Buxaceae, Buxales)

An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG IV

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