Flora of North America species comparison

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Argemone ochroleuca

pale Mexican pricklypoppy
Habit Plants annual or short-lived perennial.
Stems

branching distally, 3-10 dm, sparingly prickly.
Leaf

blades: abaxial surface sparingly prickly on veins, adaxial surface usually unarmed;

proximal deeply lobed nearly to midrib;

distal more shallowly lobed, usually clasping.
Inflorescences

buds oblong, body 8-18 × 4-11 mm, with 4-10 prickles per sepal;

sepal horns terete, 5-12 mm, unarmed.
Flowers

3-7 cm broad, closely subtended by 1-2 foliaceous bracts;

petals lemon yellow or rarely darker yellow;

stamens 20-75;

filaments yellow;

pistil 3-6-carpellate.
Capsules

ovoid-ellipsoid to oblong, 20-50 × 10-18 mm (including stigma and excluding prickles), longest prickles 8-12 mm.
Seeds

1.5-2 mm.
2n

= 56.

Argemone ochroleuca
Phenology Flowering and fruiting spring–fall.
Habitat Disturbed soil, often a weed of fields, roadways, embankments, intermountain plains
Elevation 0-2250 m (0-7400 ft)
Distribution
from FNA
AZ; Mexico [Introduced in North America]
[WildflowerSearch map]
[BONAP county map]
Discussion

Argemone ochroleuca is widespread in temperate and tropical regions of the world as an introduced weed.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 3.
Parent taxa Papaveraceae > Argemone
Sibling taxa
A. aenea, A. albiflora, A. arizonica, A. aurantiaca, A. chisosensis, A. corymbosa, A. gracilenta, A. hispida, A. mexicana, A. munita, A. pleiacantha, A. polyanthemos, A. sanguinea, A. squarrosa
Synonyms A. mexicana var. ochroleuca
Name authority Sweet: Brit. Fl. Gard. 3: plate 242. (1828)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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