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Naturalized flora of The Morton Arboretum
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Senecio lyonii
A. Gray
Family:
Asteraceae
Santa Catalina Ragwort
FNA
Resources
Theodore M. Barkley+ in Flora of North America (vol. 20)
Subshrubs or shrubs,
(20-)40-150 cm (taproots woody).
Herbage
sparsely hairy, unevenly glabrate (usually with persistent tomentum in leaf axils and on abaxial leaf faces).
Stems
usually multiple (arching upwards).
Leaves
evenly distributed (proximal withering before flowering); sessile or obscurely petiolate; blades ± oblong or elliptic, (4-)6-10(-12) × 1.5-3 cm (1-2-pinnatifid, lobes ± linear, 1-2 mm wide), bases ± linear, ultimate margins entire.
Heads
4-12 in cymiform arrays (involucres campanulate, 8-15 mm diam.).
Calyculi
0 or of 1-3+ (inconspicuous) bractlets.
Phyllaries
(± 13) ± 21, (5-)6-8 mm, tips minutely black.
Ray florets
± 13; corolla laminae 8-10 mm.
Cypselae
hairy.
2
n
= 40.
Flowering spring. Ocean bluffs, open hillsides; of conservation concern; 0-500 m; Calif.; Mexico (Baja California).
Senecio lyonii
is known from the Channel Islands (off the coast of southern California) and south.
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