Archivos de Diario para abril 2024

04 de abril de 2024

Variegated Yellow Archangel

The variegated yellow archangel (Lamium galeobdolon subsp. argentatum) is believed to be native to Europe (but its origins are unknown). It has become an invasive subspecies in several European countries, including the Netherlands, Britain, and Switzerland. It was introduced as a garden plant in New Zealand and North America (and probably elsewhere) where it escaped cultivation and became naturalized. In New Zealand, it is listed by the 2020 National Pest Plant Accord and therefore banned from sale, propagation, and distribution throughout the country. It is also listed by the Invasive Species Council of British Columbia in Canada. In the U.S. states of Washington and Oregon, it is listed as a Class B Noxious Weed and therefore banned from sale by state law.

Botanists in Europe recognize four closely-related taxa, either as subspecies of Lamium galeobdolon or as full species, usually in genus Lamium but also in Galeobdolon or Lamiastrum. Most North American authorities recognize a single taxon, referred to as either Lamium galeobdolon or Lamiastrum galeobdolon. In any case, multiple taxa are not recognized in North America.

The invasive subspecies argentatum is readily distinguished by its silvery white variegated leaves. It is sometimes confused with a cultivar of subspecies flavidum known as 'Hermans Pride', which also has silvery markings on its leaves. Unlike subspecies argentatum, however, subspecies flavidum is not stoloniferous, and therefore 'Hermans Pride' is not invasive.

For more information, including numerous reliable sources, see the article on Lamium galeobdolon in wikipedia.

Publicado el 04 de abril de 2024 a las 12:38 PM por trscavo trscavo | 21 comentarios | Deja un comentario

30 de abril de 2024

Identification of Trillium ovatum

Trillium ovatum is a white-flowered pedicellate trillium native to western North America. For decades, botanists have recognized two taxa, but based on unpublished data circulated in 2019, Plants of the World Online (and therefore iNaturalist) came to recognize four taxa. An identification key for this group of trilliums appeared in a journal article in March 2024, but since the article is not easily accessible, the key has been reproduced in the following document:

A full citation to the journal article plus links to related resources are included in the linked document.

Publicado el 30 de abril de 2024 a las 01:21 PM por trscavo trscavo | 4 comentarios | Deja un comentario