from the GNU version of the Collaborative International Dictionary of English
- n. A very large genus of composite plants including the groundsel and the golden ragwort.
from The Century Dictionary and Cyclopedia
- n. A genus of composite plants, type of the tribe Senecionideæ and subtribe Eusenecioneæ.
- n. [lowercase] A member of this genus.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. enormous and diverse cosmopolitan genus of trees and shrubs and vines and herbs including many weeds
Sorry, no etymologies found.
P.eudo-Arnica_, and another species of Senecio (_Senecio frigidus_); the _Oxytropis nigrescens_, close-tufted and rich in flowers, not stunted here as in Chukch Land; several species of P.dicularis in their fullest bloom (_P. sudetica, P. Langsdorfii, P. Oederi_ and
On the highest parts of mountains (aprox. 3300-4500 m), specially adapted perennial forbs of generas such as Senecio, Nassauvia, Chaetanthera, Draba, Barneoudia, Leucheria, and Moschopsis, withstand the extreme wind and cold of the denuded rocky terrain, or the moving scree slopes.
On another hand, genera such as Senecio that present so many closely related species in the area, probably had a relatively recent pulse of diversification associated to the climatic fluctuations of Quaternary times.
Each plant is named "Senecio" because of the grey woolly pappus of its seeds, which resemble the silvered hair of old age.
On one summit of Mount Kahuzi Hedythrsus thamnoideus and Disa erubescens grow; on its main summit, between 3,200 and 3,308 m, Erica spp. grow with Senecio kahuzicus, Helichrysum mildbraedii, Huperzia saururus and Deschampsia flexuosa. 48 species with 2 unknown and 24 endemic species are found in the park.
It has many names but I know it as Common Ragwort, Jacobaea vulgaris or Senecio jacobaea.
The genus Senecio is particularly diverse, with half of the two dozen species found nowhere else.
Glaciers and rock occur at the highest altitudes, below which is alpine moorland with giant Senecio, giant lobelia and bogs, followed by zones of giant heather, bamboo, montane forest, mid-altitude forest, lowland forest, woodland, and savanna.
Her research involved, successively, identification and syntheses of a number of metabolites of carcinogenic and related polycyclic aromatic hydrocarbons (PAHs); simulation in vitro of biological oxidations of PAHs; isolation of carcinogens from shale oil and coal tar; and, from the 1960s, studies on the carcinogenic action of certain pyrrolizidine (Senecio) alkaloids and their ability to induce chronic lesions and tumors in the liver, pancreas, etc., and of diazomethane and certain nitroso compounds.
At all altitudes Senecio favors the damper and more sheltered locations, and in the alpine bogs is associated with another conspicuous plant, growing up to 10 m tall, the endemic giant lobelia Lobelia deckenii.