- Group 1Lycophytes, Monilophytes
- Group 2Gymnosperms
- Group 3Monocots
- Group 4Woody angiosperms with opposite or whorled leaves
- Group 5Woody angiosperms with alternate leaves
- Group 6Herbaceous angiosperms with inferior ovaries
- Group 7Herbaceous angiosperms with superior ovaries and zygomorphic flowers
- Group 8Herbaceous angiosperms with superior ovaries, actinomorphic flowers, and 2 or more distinct carpels
- Group 9Herbaceous angiosperms with superior ovaries, actinomorphic flowers, connate petals, and a solitary carpel or 2 or more connate carpels
- Group 10Herbaceous angiosperms with superior ovaries, actinomorphic flowers, distinct petals or the petals lacking, and 2 or more connate carpels
Arnoglossum 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).
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
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
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
Show photos of: Each photo represents one species in this genus.