Hieracium radyrense

Taxobox
name = Radyr Hawkweed


image_width = 240px
image_caption =
regnum = Plantae
divisio = Magnoliophyta
classis = Magnoliopsida
ordo = Asterales
familia = Asteraceae
tribus = Cichorieae
genus = "Hieracium"
species = "H. radyrense"
binomial = "Hieracium radyrense"
binomial_authority = (Pugsley) P.D. Sell & C. West

Radyr Hawkweed is the common name of "Hieracium radyrense", a very rare endemic species restricted to Radyr in south Wales, UK. First identified in 1907 it was described as a variety in 1948 and a species in 1955.cite web|url=http://www.watsonia.org.uk/25_4_HutchinsonHieracium.pdf|title=Radyr Hawkweed|accessdate=2008-06-21] and belongs to Hieracium Section Vulgata. It has rarely been seen and surveys between 1998 and 2004 indicate that only one population of around twenty five plants survive.

A polycarpic perennial, Radyr Hawkweed flowers from late May to early June or July. Specimens found at Danybryn in Radyr grew on a grassy bank and lawn under the partial shade of trees and shrubs.

Identification

The main features are broadly ovate-lanceolate, acute basal rosette leaves, with diagnostic marked teeth on the rosette leaves and dense stellate hairs on the involucral bracts. With two or three acuminate stem leaves irregularly and sharply toothed, these are laciniate dentate towards the base. The ligules are hairy at the apex.

References

External links

[http://www.biodiversitywales.org.uk/English/Library/SpeciesAudit/default.aspx?id=655 Biodiversity Wales - Radyr Hawkweed]