Roldana
Encyclopedia
Roldana also known as groundsel
is a genus
of large herbs or subshrub
s from the tribe Senecioneae
and the family Asteraceae
. Most if not all of its members used to be Senecio
. There are approximately 50 species which are native to Southwest United States, Mexico
and Central America
and naturalized elsewhere.
Source: NRCS
Groundsel
Senecio vulgaris, often known by the common name Common groundsel, a humble in appearance member of the Asteraceae family and Senecio genus, is a tenacious deciduous annual whose presence now encompasses the globe in a wide area of easy to somewhat difficult growing conditions.The discussion of...
is a genus
Genus
In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...
of large herbs or subshrub
Shrub
A shrub or bush is distinguished from a tree by its multiple stems and shorter height, usually under 5–6 m tall. A large number of plants may become either shrubs or trees, depending on the growing conditions they experience...
s from the tribe Senecioneae
Senecioneae
Senecioneae is the largest tribe of the Asteraceae, or the sunflower family, comprising approximately 150 genera and 3,000 species. Almost one-third of the species in this tribe are placed in the genus Senecio...
and the family Asteraceae
Asteraceae
The Asteraceae or Compositae , is an exceedingly large and widespread family of vascular plants. The group has more than 22,750 currently accepted species, spread across 1620 genera and 12 subfamilies...
. Most if not all of its members used to be Senecio
Senecio
Senecio is a genus of the daisy family that includes ragworts and groundsels. The flower heads are normally rayed, completely yellow, and the heads are borne in branched clusters...
. There are approximately 50 species which are native to Southwest United States, Mexico
Mexico
The United Mexican States , commonly known as Mexico , is a federal constitutional republic in North America. It is bordered on the north by the United States; on the south and west by the Pacific Ocean; on the southeast by Guatemala, Belize, and the Caribbean Sea; and on the east by the Gulf of...
and Central America
Central America
Central America is the central geographic region of the Americas. It is the southernmost, isthmian portion of the North American continent, which connects with South America on the southeast. When considered part of the unified continental model, it is considered a subcontinent...
and naturalized elsewhere.
Selected species
- Roldana hartwegii (Benth.) H. Rob. & Brettel -- Hartweg's groundsel
- Senecio hartwegii Benth.
- Roldana petasitisRoldana petasitisRoldana petasitis also known as velvet groundsel is a species of the genus Roldana and family Asteraceae that used to be a Senecio.-Distribution:Native:...
(Sims) H. Rob. & Brettell -- velvet groundsel - Senecio petasitis (Sims) DC.
Source: NRCS