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Papers by Peter Hoch

Annals of the Missouri Botanical Garden, 1997

Systematic botany monographs, 1992

Annals of the Missouri Botanical Garden, Jun 18, 2008

BioOne sees sustainable scholarly publishing as an inherently collaborative enterprise connecting... more BioOne sees sustainable scholarly publishing as an inherently collaborative enterprise connecting authors, nonprofit publishers, academic institutions, research libraries, and research funders in the common goal of maximizing access to critical research.

American Journal of Botany, Jul 1, 2021

HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

Harvard Papers in Botany, Jun 30, 2022

Brittonia, Dec 1, 2008

Aperture morphology of tetrad pollen of Epilobium luteum (Onagraceae: Epilobieae) from three Alas... more Aperture morphology of tetrad pollen of Epilobium luteum (Onagraceae: Epilobieae) from three Alaskan collections is highly variable. The first collection appears to lack apertures altogether and is presumed to consist of immature pollen gains in a genus known to achieve mature size before the apertures become distinctly protruding. A second collection has tetrads with 3-and 4-apertured grains, the apertures in the latter are often irregularly spaced and not in apposition with the apertures of neighboring members. The third collection consists of the more typical 3-apertured members that characterize the majority of Epilobium pollen grains. In all of these collections individual pollen grains (monads) are interspersed among the tetrads. The variations in the number of apertures emphasize the importance of having a comprehensive understanding of the stage of development of the pollen (taxon) examined when describing pollen collections. In the first collection this would mean the recognition that in Onagraceae apertures occur in the later stages of microspore ontogeny. In the latter two collections a thorough background of the literature of the pollen morphology on this largest Onagraceae taxon is useful for the understanding of the significance of a range of aperture numbers on Epilobium pollen grains.

Recent molecular phylogenetic analyses in the plant family Onagraceae support the need for revisi... more Recent molecular phylogenetic analyses in the plant family Onagraceae support the need for revisions in the family classification. In this paper we briefly survey the history of generic and suprageneric classification in Onagraceae, summarize our knowledge of the morphological and molecular variation in the family in a phylogenetic context, and propose a revised classification that reflects that phylogeny. We include a specieslevel synopsis of the family, incorporating all nomenclatural changes and combinations but not full species-level synonymy. We provide descriptions of all taxa recognized for the first time, as well as tribes, genera, sections, subsections, and series. In this treatment, we recognize 22 genera in the family, subdivided into two subfamilies, subfam. Ludwigioideae (only Ludwigia) and subfam. Onagroideae (the other genera), and the latter into six tribes, two with only one genus each, three with two genera each, and one (tribe Onagreae) with 13 genera. Chromosome numbers and breeding system information are summarized, as is the geographical and ecological distribution of each taxon. For each group we list the included taxa. Many changes involve the tribe Onagreae, from which we have segregated Gongylocarpus as its own tribe, sister to the tribes Epilobieae and Onagreae, and within which we propose changes in the delimitation of Camissonia and Oenothera. Camissonia as currently defined is broadly paraphyletic; our new classification recognizes nine generic lineages (Camissonia, Camissoniopsis, Chylismia, Chylismiella, Eremothera, Eulobus, Holmgrenia, Taraxia, and Tetrapteron), which in part form a grade at the base of Oenothera. Each of these lineages is well-supported by morphological and molecular data. In contrast, molecular and morphological data both suggest the need to broaden the delimitation of Oenothera to include Calylophus, Gaura, and Stenosiphon. This redefined Oenothera, strongly supported by molecular data, is marked by at least two morphological synapomorphies: the presence of an indusium on the style, and a lobed or peltate stigma. We summarize these new generic alignments and review the morphological characters used to diagnose all tribes, genera, and sections. New taxa recognized include subfamilies Ludwigioideae and Onagroideae, two genera (Camissoniopsis and Holmgrenia), three sections (Epilobium sect. Macrocarpa, Oenothera sect. Leucocoryne, and O. sect. Xanthocoryne), and one subspecies (O. macrocarpa subsp. mexicana). All other nomenclatural novelties involve new combinations or new names; these include three genera (Chylismiella, Eremothera, and Tetrapteron), 23 sections or subsections (Chylismia sect. Lignothera; Clarkia sect.

Taxon, May 1, 1995

... His interpretation was followed by several others, including Brit-ton & Brown (Ill. Fl. N... more ... His interpretation was followed by several others, including Brit-ton & Brown (Ill. Fl. NUS2: 482. 1897; ed. 2, 2: 591. 1913), Rydberg (Fl. Rocky Mts.: 588. 1917), and Fernald (in Gray, Manual, ed. 8: 1062. 1950). 238 Page 3. TAXON 44 - MAY 1995 ...

PhytoKeys, May 27, 2015

In 1953, Hara provided new combinations for many sectional and species names when he combined Jus... more In 1953, Hara provided new combinations for many sectional and species names when he combined Jussiaea L. with Ludwigia L., and at the time, Ludwigia sect. Oligospermum (Micheli) H.Hara was the correct name for one well-defined section. However, subsequent changes to/clarifications of the botanical code have necessitated a change for that name in that now an autonym is treated as having priority over the name or names of the same date and rank that established it. Since Hara's combination was based on Jussiaea sect. Oligospermum Micheli, the correct name for this section is Ludwigia sect. Jussiaea (L.

Annals of the Missouri Botanical Garden, May 1, 2017

It is with great appreciation that we acknowledge the following reviewers who have served our res... more It is with great appreciation that we acknowledge the following reviewers who have served our research community by reviewing manuscripts for Nutrients in 2011.

TAXON, 2017

Ludwigia (Onagraceae) is a worldwide wetland genus with 83 species currently classified as member... more Ludwigia (Onagraceae) is a worldwide wetland genus with 83 species currently classified as members of 23 sec tions. Past studies have documented the morphological diversity and complex evolutionary history. Here we provide the first comprehensive molecular phylogeny of Ludwigia, using our new data to examine the existing evolutionary hypotheses. We employed both nuclear (ITS, waxy) and chloroplast (rps16, rpl16, trnL-trnF, trnL-CD, trnG) DNA regions for this study. Our results suggest that the North Temperate haplostemonous (NTH) group and a second group that includes all other species of Ludwigia (clade B) form strongly supported sister clades. In the NTH group, a monophyletic sect. Ludwigia is sister to the Microcarpium complex, but sect. Microcarpium and sect. Isnardia are not monophyletic. In clade B, the multi-species sec tions Jussiaea and Macrocarpon are well-supported monophyletic clades, but others, including the largest sect. Myrtocarpus, are not monophyletic. In sum, this first molecular phylogeny of Ludwigia clarifies and supports several major relationships in the genus but also highlights parts of the classification that should be changed. Our results imply that allopolyploidy played an important role in the evolutionary history of the genus, giving rise to complex patterns of relationships that are not yet adequately reflected in the classification.

Annals of the Missouri Botanical Garden, 1984

Annals of the Missouri Botanical Garden, 1979

In his sectional delimitation of the genus Epilobium, Raven (1976) reduced the diploid (ai = 15) ... more In his sectional delimitation of the genus Epilobium, Raven (1976) reduced the diploid (ai = 15) Zauschneria septentrionalis Keck to a subspecies of the polymorphic diploid and tetraploid {n = 30) E. canum (Greene) Raven. We agree with most aspects of his interpretation, but have concluded as a result of detailed field and herbarium studies that Zauschneria septentrionalis should be treated as a distinct species. It is entirely allopatric with E. canum s. lat., although the two entities occur within about 200 m of one another along the Trinity River and the South Fork of the Eel River. The more local diploid is characterized by a distribution on rock ledges in the valleys of the Eel, Mattole, and Trinity rivers of Humboldt, Mendocino, and Trinity counties, California, at elevations from 20 to 125 m. It can readily be distinguished from all phases of E. canum by a combination of its distinctive short but suffruticose habit, subentire leaf margins, and white-canescent pubescence on the lower leaves. We therefore propose the following new combination, in anticipation of a more complete sectional revision, and in order to make the name available.

Annals of the Missouri Botanical Garden, 1990

ABSTRACT