Argemone pleiacantha subsp. ambigua
Mem. Torrey Bot. Club 21: 101. 1958.
Synonyms: Argemone pleiacantha var. ambigua (G. B. Ownbey) Shinners
Treatment appears in FNA Volume 3.
Stems 5-10 dm. Leaf blades: proximal lobed 1/2-2/3 distance to midrib; distal often clasping. Inflorescences: bud prickles simple. Capsules sparingly prickly.
Phenology: Flowering spring–summer; fruiting summer–fall.
Habitat: Dry slopes and embankments, foothills
Elevation: 1000-1800 m
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