Ambrosia acanthicarpa

Hooker

Fl. Bor.-Amer.1: 309. 1833

Synonyms: Franseria acanthicarpa
Found in FNA Volume 21. Treatment on page 15. Mentioned on page 11.
Annuals, 10–80+ cm. Stems erect. Leaves opposite (proximal) and alternate; petioles 5–15(–25+) mm; blades ± deltate, 15–40(–85+) × 12–35(–80+) mm, 1–2-pinnately lobed, bases cuneate, ultimate margins entire or toothed, abaxial faces hispid and strigillose to sericeous, adaxial faces strigillose and gland-dotted. Pistillate heads clustered, proximal to staminates; florets 1. Staminate heads: peduncles 0.5–2 mm; involucres shallowly cup-shaped (usually each with 1–5+ black nerves), 3–5(–7) mm diam., sparsely hirsute or glabrous; florets 6–12(–20+). Burs: bodies fusiform to obpyramidal, 3–5 mm, ± hirsutulous or glabrate, spines 8–18+, scattered, stoutly subulate (sometimes basally flattened or navicular), 2–4(–5) mm, tips straight or uncinate. 2n = 36.

Phenology: Flowering (Apr–)Jul–Nov.
Habitat: Canyons, sandy flats, dunes
Elevation: 10–3000 m

Distribution

Alta., Man., Sask., Ariz., Calif., Colo., Idaho, Kans., Minn., Mo., Mont., Nebr., Nev., N.Mex., N.Dak., Okla., Oreg., S.Dak., Tex., Utah, Wash., Wyo.

Discussion

References

None.

Facts about "Ambrosia acanthicarpa"
AuthorJohn L. Strother +
Elevation10–3000 m +
HabitatCanyons, sandy flats, dunes +
IllustratorBarbara Alongi +
PhenologyFlowering (Apr–)Jul–Nov. +
ReferenceNone +
SynonymFranseria acanthicarpa +
Taxon nameAmbrosia acanthicarpa +
Taxon parentAmbrosia +
Taxon rankspecies +
VolumeVolume 21 +