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FNA | Family List | FNA Vol. 20 | Asteraceae | Senecio

46. Senecio serra Hooker, Fl. Bor.-Amer. 1: 333. 1834.

Perennials, 40–100(–250) cm (caudices ligneous, branched). Herbage glabrous or lightly floccose-tomentose proximally when young. Stems single or loosely clustered. Leaves evenly distributed (proximal often withering before flowering); petiolate or subsessile; blades lanceolate or narrowly lanceolate to sublinear, 5–15(–20+) × (1–)1.5–4 cm, bases tapered, margins dentate to subentire (distal leaves smaller, bractlike). Heads 30–90+ in corymbiform to subpaniculiform arrays. Calyculi of 2–6 linear to filiform bractlets (0.5–5 mm). Phyllaries ± 8 or ca. 13, 4–9 mm, tips usually green, sometimes black. Ray florets ± 5 or ± 8; corolla laminae 5–10 mm. Cypselae glabrous or glabrate. 2n = 40.

Varieties 2 (2 in the flora): w United States.

Varieties of Senecio serra are distinguished by head size and distribution.


1 Heads 40–90+; phyllaries ± 8, 4–6 mm; ray florets ± 5, corolla laminae 5–7 mm; disc florets 10–20   46a Senecio serra var. serra
+ Heads (12–)30–50; phyllaries ± 13, 7–9 mm; ray florets ± 8, corolla laminae 7–10 mm; disc florets 20–40+   46b Senecio serra var. admirabilis


 

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