larch-leaved groundsel

Senecio laricifolius is a perennial herb or dwarf shrub in the family Asteraceae, belonging to the immense genus Senecio, one of the largest genera of flowering plants globally with over 1,000 species distributed on every continent. The epithet 'laricifolius' means 'larch-leaved,' referring to leaves resembling those of larch trees (Larix), which suggests narrow, needle-like or linear leaves—a distinctive morphological feature helping to identify this species among the broader genus. Such narrow, ericoid-type leaves are adaptations to dry, exposed, or alpine environments where reducing leaf surface area minimizes water loss. The genus Senecio is extraordinarily ecologically diverse, ranging from annuals in disturbed habitats to massive tree senecios on East African volcanic mountains. Senecio laricifolius is likely native to Mediterranean Europe or the Middle East, where xeric-adapted plants with narrow, revolute leaves are common in rocky and scrubby vegetation. The plant produces erect or ascending branches bearing solitary or few radiate capitula with yellow ray and disc florets. Phyllaries are in one main row plus a few short outer bracts. Achenes are ribbed and bear a pappus of white capillary bristles that aid in wind dispersal. Plants in open, dry shrublands and rocky slopes tolerate poor soils and drought stress. The genus Senecio produces pyrrolizidine alkaloids in many species, which are toxic to livestock and protect plants from generalist herbivores.