Senecio
See list of 5 species in this genusArnoglossum atriplicifolium (L.) H.E. Robins. was reported from New England based on an erroneously determined collection by Faxon from Middlesex County, MA ( GH!). This specimen was, in fact, Senecio suaveolens. Senecio eremophilus Richards. var. macdougalii (Heller) Cronq. was reported from MA by Knowlton and Deane (1924), but specimens are unknown. Senecio pseudoarnica Less. was reported from ME by Gleason and Cronquist (1991), but specimens are unknown. See Pelser et al. (2007) for new circumscription of this genus (i.e., rationale for inclusion of Hasteola and segregation of Jacobaea). Reference: Barkley (2006).
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1a. Corollas green-white to yellow-white (rarely pink-tinged); lower leaf blades triangular-hastate, sharply toothed; cypsela body 5–7 (–9) mm long
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1b. Corollas yellow to orange; leaf blades mostly oblong to obovate in outline, coarsely toothed to 1 or more times pinnately lobed; cypsela body 1.5–2.5 mm long
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2a. Leaf blades linear to filiform (sometimes parted into linear-filiform lobes); subshrubs with the taproots forming a woody crown
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2b. Leaf blades oblong or oblanceolate to ovate or obovate, toothed or pinnately lobed to divided [Fig. 449]; annuals with taproots lacking a woody crown
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3a. Leaf blades and stems densely and conspicuously glandular-pubescent [Fig. 449]; cypsela body glabrous; shorter, outer series of involucral bracts 2–4 mm long
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3b. Leaf blades and stems pubescent to subglabrous, glandular hairs absent or sparse; cypsela body pubescent; shorter, outer series of involucral bracts 1–2 (–2.5) mm long
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4a. Rays present, though inconspicuous; involucral bracts without a dark apex; involucre with about 13 principal involucral bracts
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4b. Rays absent; involucral bracts with a dark apex, this dark red to red-brown, becoming black [Fig. 450]; involucre with about 21 principal involucral bracts
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Each photo represents one species in this genus.