Flora of the Hawaiian Islands
Dicotyledon Literature for Argemone mexicana
Wagner et al., 1990, 1999.
   Papaveraceae -- The Poppy Family Bibliography
      Argemone mexicana

Common name(s): prickly poppy, Mexican poppy
General Information
DistributionNative to the West Indies and Mexico.In the Hawaiian Islands, naturalized on Kaua`i, O`ahu, Moloka`i, Maui.

Annual herbs; stems 2.5-10 dm long, branched, sparsely to moderately covered with prickles.
Leaves glaucous, oblong-oblanceolate, pinnately lobed 1/2-3/4 to midrib, both surfaces sparsely covered with prickles along veins, margins somewhat sinuate-dentate, the teeth tipped with a prickle, sessile, upper ones usually somewhat clasping the stem.
Buds subglobose, 1.2-1.6 cm long, sparsely prickly; sepal horns terete, 5-10 mm long; petals bright yellow, 1.7-3 cm long; stamens 30-50; ovary 4-6-carpellate.
Capsules oblong to broadly ellipsoid, 3-4.2 cm long, each valve with 9-15 prickles, the longest one 7-10 mm long.
Seeds numerous, 1.2-1.5 mm in diameter.
2n = 28