Bidens lemmonii
in A. Gray et al., Syn. Fl. N. Amer. 1(2): 297. 1884.
Annuals, (10–) 15–25 (–30+) cm. Leaves: petioles 10–20 mm; blades either oblanceolate to linear, 5–15+ × 1–2+ mm, or rounded-deltate overall, 10–25 (–60+) × 15–25+ mm, (1–) 2–3-pinnatisect, ultimate lobes oblanceolate to spatulate or linear, 5–15+ × 0.5–5 mm, bases ± cuneate, ultimate margins entire, sometimes ciliolate, apices obtuse to acute, faces glabrous. Heads usually borne singly, sometimes in open, ± corymbiform arrays. Peduncles 10–20 (–90) mm. Calyculi of (1–) 3–4 appressed to spreading, spatulate to linear bractlets or bracts 3–10 (–25+) mm (sometimes foliaceous: pinnate, lobes 3–5+, linear), margins ciliolate, abaxial faces usually glabrous, sometimes sparsely hispidulous. Involucres ± campanulate to cylindric, 2–3 (–8) × 2 (–3) [–4] mm. Phyllaries (3–) 5, oblong to lanceolate orlinear, (2–) 3–8 mm. Ray-florets 0 or 1 (–3+); laminae whitish, 1–1.5 (–3+) mm. Disc-florets (3–) 5–9; corollas whitish to yellowish, 2–2.5 mm. Cypselae: outer redbrown (sometimes with lighter blotches), ± equally 4-angled, linear-fusiform, 5–6 (–8) mm, margins not ciliate, apices ± attenuate, faces 2-grooved, usually glabrous; inner similar, 10–14 mm; pappi of 2–3 erect, retrorsely barbed awns 1–2 (–3) mm.
Phenology: Flowering Sep–Oct.
Habitat: Wettish spots on rocky slopes
Elevation: 1400–2100 m
Distribution
Ariz., N.Mex., Mexico
Discussion
Selected References
None.