Compilation
Ambrosia chamissonis

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Name

Identification
Franseria cuneifolia Nuttall [family ASTERACEAE ] (stored under name); Verified by Nuttall, T., Ambrosia chamissonis (Less.) Greene [family ASTERACEAE ] Verified by Payne, W.W., 1964 Franseria chamissonis Less. [family ASTERACEAE ] Verified by Not on Sheet,
Related name
  • Franseria chamissonis
  • Franseria bipinnatifida
  • Franseria cuneifolia
  • Ambrosia chamissonis

Flora

Entry for Ambrosia chamissonis (Lessing) Greene [family COMPOSITAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 21,
Names
Ambrosia chamissonis (Lessing) Greene [family COMPOSITAE], Man. Bot. San Francisco, 188. 1894
Franseria chamissonis Lessing [family COMPOSITAE], Linnaea, 6: 507. 1831
Franseria chamissonis subsp. bipinnatisecta (Lessing) Wiggins & Stockwell [family COMPOSITAE]
A. chamissonis var. bipinnatisecta (Lessing) J. T. Howell [family ]
Treatment Author(s)
John L. Strother
Information
Perennials, 50–150(–350+) cm. Stems prostrate or decumbent. Leaves mostly alternate; petioles 15–30(–45+) mm; blades rounded-deltate to ovate or obovate, 20–45(–70+) × 10–25(–50+) mm overall, not lobed or 1–2(–3)-pinnately lobed, bases cuneate, ultimate margins entire or toothed, abaxial and adaxial faces strigillose to sericeous. Pistillate heads clustered, proximal to staminates; florets 1. Staminate heads: peduncles 0.5–2 mm; involucres shallowly cup-shaped, 4–6+ mm diam., strigillose; florets 8–25(–50). Burs: bodies fusiform to ± pyriform, 4–7+ mm, ± strigillose to pilosulous, spines 8–16+, scattered, stoutly conic or flattened- to triquetrous-subulate, 0.5–1.5+ mm, tips straight. 2n = 36.
Phenology
apr-may (spring), jun-aug (summer), sep-nov (fall)
Altitude range
0–10 m;
Distribution
Mexico (Baja California).USA AlaskaUSA Calif.USA Oreg.USA Wash.Canada B.C.

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