Taxonomic changes in Oenothera sections Gaura and Calylophus (Onagraceae)

Abstract

The long-recognized genus Gaura was shown recently to be deeply nested within one of two major clades of Oenothera. New molecular data indicate further taxonomic changes are necessary in Oenothera sect. Gaura. We make these changes here, including three new combinations, in advance of the Onagraceae treatment for the Flora of North America. The new phylogenetic studies show that several pairs of taxa treated as subspecies in the most recent revision by Raven and Gregory (1972) had independent origins within sect. Gaura, and are here elevated to species level (Oenothera nealleyi for Gaura suffulta subsp. nealleyi; Oenothera dodgeniana for Gaura neomexicana subsp. neomexicana; and Oenothera podocarpa for Gaura hexandra subsp. gracilis). Also, a nomenclatural problem in Oenothera sect. Calylophus is corrected by adopting the name Oenothera capillifolia Scheele for the species known previously, and nomenclaturally correct, as Calylophus berlandieri Spach. This problem necessitates a new combination Oenothera capillifolia subsp. berlandieri.

Testing Pollination Syndromes in <i>Oenothera</i> (Onagraceae)

“…In agreement with the broad literature on Oenothera evolutionary history (e.g. Raven 1988;Raven & Gregory 1972;Wagner et al 2007;Wagner et al 2013), these suggest that ancestral Oenothera were moth pollinated. It is possible Fitting with this interpretation, most Gaura are moth pollinated and cluster in morphospace (Fig.…”

“…To accomplish this, we assigned each Oenothera species a specialization score (i.e. S-score), which equals the minimum number of pollinating taxa that account for 95% of an Oenothera species' pollen flow; S-scores were taken from Krakos and Fabricant (2014), as well as an unpublished data set at the Missouri Botanical Garden for O. coloradoensis (see Wagner et al 2013). We then ran a linear regression, with S-score as the predictor variable and Euclidean distance from the nearest pollination syndrome as the response variable, to test whether pollinator specialization impacts how close Oenothera species are to traditional pollination syndromes in morphospace.…”

“…Onagraceae -the evening primrose family, one of the major plant radiations in western North America (Raven 1979;Raven & Gregory 1972;Straley 1977) -is an ideal group in which to test the predictive ability of pollination syndromes. The genus Oenothera is a model system for studying plant reproductive biology and floral evolution, with a wealth of literature describing Oenothera taxonomy and phylogenetics (Krakos 2011;Krakos et al accepted;Raven 1988;Raven & Gregory 1972;Wagner et al 2007;Wagner et al 2013). Oenothera is a species rich, monophyletic group, with a diversity of floral traits (e.g.…”

Adatok és kiegészítések a magyarországi adventív flóra kivadult, meghonosodott és potenciális inváziós fajainak ismeretéhez

“…A magyar névvel jelenleg nem rendelkező taxonok esetében pedig a szerzők tettek javaslatot a jövőben alkalmazandó magyar névre (az Elektronikus mellékletben a magyar név előtt '*' jellel jelölve). Az egyes problémásnak tekinthető taxonok határozásához a belga adventív növényfajokkal foglalkozó weboldalon szereplő határozókulcsokat, valamint a következő munkákat használtuk fel: Abies -DE LANGHE 2015 ; Eragrostis - [8]; Euonymus -MA et al (2008); Gaillardia -SOUTAMIRE (1960), HANSEN (1976), BEAN (2015); Galanthus -WEBB (1980); Gaura - RAVEN & GREGORY (1972), WAGNER et al (2013); Gazania -MAGEE et al (2011); Helichrysum -CLAPHAM (1976); Lagurus -TUTIN (1980); Lantana -SANDERS (2012); Ligustrum -CHANG et al (1996); Lonicera -YANG et al (2011); Mahonia -YING et al (2011); Melia -MABBERLEY (1984), PENG et al (2008); Muscari -DAVIS & STUART (1980); Ostrya -DE LANGHE (2013); Oxalis -YOUNG (1968); Salvia -HEDGE (1972), WOOD & HARLEY (1989), LI & HEDGE (1994); Paeonia -CULLEN & HEYWOOD (1964), HONG & ZHOU (2003); Paronychia -CHATER (1964a); Persea -WILLIAMS (1977), VAN DER WERFF (2002); Photinia -LINGDI et al (2003); Plantago -CHATER & CARTIER (1976); Prunus -WEBB (1968); Pterostyrax -DE LANGHE (2019); Quercus -SCHWARZ (1964); Rosmarinus -DO AMARAL FRANCO & DA ROCHA AFONSO (1972); Salix - TUTIN (1964a); Sapindus -SALYWON (1999); Saponaria -CHATER (1964b); Schizachyrium - [9]; Sedum -WEBB (1964), STEPHENSON (1994); Spartium -HEYWOOD (1968); Tetragonia - TUTIN (1964b), HARTMANN (2017b); Tradescantia -HUNT (1983); Verbena -DO AMARAL FRANCO (1...…”

Growing evening primroses (Oenothera)

“…Interesting exceptions from the standard germination protocols are species with fruits that do not dehisce (i.e., section Gaura ). Capsules, which only contain one to four (five) seeds ( Wagner et al, 2013 ), are placed in 1 cm depth into the substrate and exposed to fluorescent white light at regular greenhouse temperatures until seedlings establish. This procedure is required because the seeds are embedded in very hard tissue.…”