Ambrosia cheiranthifolia A.Gray

Cite taxon page as 'WFO (2021): Ambrosia cheiranthifolia A.Gray. Published on the Internet; Accessed on: 17 Oct 2021'

General Information

Perennials or subshrubs, 10–30+ cm (rhizomatous and/or soboli­ferous, colonial). Stems erect. Leaves opposite (distal sometimes alternate); petioles 0; blades lanceolate or lance-elliptic to lance-oblong or oblanceolate, 20–50(–70+) × 8–12(–25+) mm, rarely ± pinnately lobed (lobes ± deltate), bases cuneate (then rounded), margins entire or toothed, abaxial faces densely strigose (silvery gray), adaxial faces strigillose. Pistillate heads clustered (in axils), proximal to staminates; florets 1(–2). Staminate heads: peduncles 1–4+ mm; involucres cup-shaped (sometimes with black nerve in each lobe), 3–4+ mm diam., strigillose; florets 8–18+. Burs: bodies ± pyriform to ± globose, 2–3+ mm, glabrous or strigose, spines (1–)3–5+, scattered, stoutly conic, 0.4–0.8+ mm, tips straight (often each with black nerve). 2n = 72.

  • Provided by: [B].Flora of North America @
    • Source: [
    • 1
    • ]. 

     Information From

    CC0 1.0 Universal (CC0 1.0).
    • A CC0 1.0 Universal (CC0 1.0).
    Flora of North America @
    'Flora of North America @ eFloras (2008). Published on the Internet [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • B Flora of North America Association
    World Flora Online consortium
    World Flora Online Data. 2018.
    • C CC0 1.0 Universal (CC0 1.0).