Archivos de Diario para septiembre 2022

lunes, 05 de septiembre de 2022

The Erectum Group

Until recently, the Erectum Group was an ill-defined group of taxa in genus Trillium but the taxonomy of the genus has improved significantly thanks to a line of research culminating in a paper published in 2022. According to that paper, [Lampley et al. 2022] the Erectum Group is synonymous with Trillium subgenus Trillium, one of four subgenera in the genus. In the iNaturalist taxonomy, subgenus Trillium consists of the following taxa:

Asia North America
Trillium apetalon Trillium cernuum (Nodding Trillium)
Trillium camschatcense (Kamchatka Trillium) Trillium erectum (Red Trillium)
Trillium channellii Trillium flexipes (Drooping Trillium)
Trillium × hagae Trillium hibbersonii (Hibberson's Trillium)
Trillium × komarovii Trillium rugelii (Southern Nodding Wakerobin)
Trillium × miyabeanum Trillium simile (Jewelled Wakerobin)
Trillium smallii (Small's Trillium) Trillium sulcatum (Southern Red Trillium)
Trillium tschonoskii (Mountain Woods Trillium) Trillium vaseyi (Vasey's Trillium)
Trillium × yezoense

Subgenus Trillium is typified by T. erectum, hence the name Erectum Group.

Distribution

Trillium subgenus Trillium is widely distributed in North America and Asia. In North America, members of the subgenus are found across Canada from Saskatchewan to Newfoundland, ranging southward to the southern Appalachian Mountains in the southeastern United States.

Subgenus Trillium in Canada:

  • British Columbia: T. hibbersonii (a geographic outlier)
  • Manitoba: T. cernuum
  • New Brunswick: T. cernuum, T. erectum
  • Newfoundland: T. cernuum
  • Nova Scotia: T. cernuum, T. erectum
  • Ontario: T. cernuum, T. erectum, T. flexipes (S1)
  • Prince Edward Island: T. cernuum
  • Quebec: T. cernuum, T. erectum
  • Saskatchewan: T. cernuum

Subgenus Trillium in the United States:

  • Alabama: T. flexipes, T. sulcatum (S1), T. vaseyi (S1)
  • Arkansas: T. flexipes (S1)
  • Connecticut: T. cernuum, T. erectum
  • Delaware: T. cernuum (S2), T. erectum (S1), T. flexipes
  • Georgia: T. erectum, T. flexipes (S1), T. rugelii, T. simile (S2), T. sulcatum (S2), T. vaseyi
  • Illinois: T. cernuum (S1), T. erectum (S1), T. flexipes
  • Indiana: T. cernuum, T. erectum, T. flexipes
  • Iowa: T. cernuum, T. flexipes
  • Kentucky: T. erectum, T. flexipes, T. sulcatum
  • Maine: T. cernuum, T. erectum
  • Maryland: T. cernuum, T. erectum, T. flexipes (S1)
  • Massachusetts: T. cernuum, T. erectum
  • Michigan: T. cernuum, T. erectum, T. flexipes
  • Minnesota: T. cernuum, T. flexipes
  • Missouri: T. flexipes
  • New Hampshire: T. cernuum, T. erectum
  • New Jersey: T. cernuum, T. erectum
  • New York: T. cernuum, T. erectum, T. flexipes (S1)
  • North Carolina: T. erectum, T. flexipes (S1), T. rugelii, T. simile (S2), T. sulcatum, T. vaseyi
  • North Dakota: T. cernuum
  • Ohio: T. cernuum (SX), T. erectum, T. flexipes
  • Pennsylvania: T. cernuum (S2), T. erectum, T. flexipes (S2)
  • Rhode Island: T. cernuum, T. erectum (S1)
  • South Carolina: T. erectum, T. rugelii (S2), T. simile (S1S2), T. vaseyi
  • South Dakota: T. cernuum (S2), T. flexipes
  • Tennessee: T. erectum, T. flexipes, T. rugelii (S2), T. simile, T. sulcatum, T. vaseyi
  • Vermont: T. cernuum, T. erectum
  • Virginia: T. cernuum (S2), T. erectum, T. flexipes (SH), T. sulcatum
  • West Virginia: T. cernuum (S1), T. erectum, T. flexipes (S2), T. sulcatum
  • Wisconsin: T. cernuum, T. flexipes

In Asia, the majority of observations have been made in eastern Asia.

Subgenus Trillium in Asia:

  • Bhutan: T. tschonoskii
  • China: T. camschatcense, T. tschonoskii
  • India: T. tschonoskii
  • Japan: T. apetalon, T. camschatcense, T. channellii, T. × hagae, T. × komarovii, T. × miyabeanum, T. smallii, T. tschonoskii, T. × yezoense
  • Korea: T. camschatcense, T. tschonoskii
  • Kuril Islands: T. apetalon, T. camschatcense, T. tschonoskii
  • Myanmar: T. tschonoskii
  • Russia: T. apetalon, T. camschatcense, T. × hagae, T. × komarovii, T. smallii, T. tschonoskii
  • Taiwan: T. tschonoskii

Based on iNaturalist observations, T. erectum is the most observed species of the subgenus (by far). The center of diversity for the subgenus occurs in the southern Appalachians.

Publicado el lunes, 05 de septiembre de 2022 a las 05:17 PM por trscavo trscavo | 3 comentarios | Deja un comentario

miércoles, 28 de septiembre de 2022

How to distinguish Foamflower from Miterwort

Heart-leaved foamflower (Tiarella cordifolia sensu lato) and two-leaved miterwort (Mitella diphylla) have similar heart-shaped basal leaves. In the absence of other identifying characteristics, the orientation of the hairs on the basal leaf stalk may be used to distinguish the species. Tiarella cordifolia has dense spreading hairs (outward-facing, angled 90 degrees) of various lengths while Mitella diphylla has long retrorse hairs (backward-facing, angled 45 degrees or less) sparsely distributed along its basal leaf stalk. The following article explains this in more detail:

The description of Mitella diphylla in Flora of North America mentions the retrorse hairs on its basal leaf stalk, but as far as I know, @erthomson was the first iNaturalist user to show how to use this character to distinguish Mitella diphylla from Tiarella cordifolia.

Publicado el miércoles, 28 de septiembre de 2022 a las 03:05 PM por trscavo trscavo | 4 comentarios | Deja un comentario