Argemone pleiacantha

Greene

Feddes Repert. Spec. Nov. Regni Veg. 6: 161. 1908.

Illustrated
Treatment appears in FNA Volume 3.

Plants annual or perennial. Stems branched, 5-12 dm, sparingly to closely prickly. Leaf-blades: abaxial surface sparingly prickly on veins, adaxial surface unarmed or sparingly prickly on veins, apices of lobes angular, marginal teeth prominent; proximal lobed ca. 3/4 distance to midrib; distal sometimes clasping. Inflorescences: buds oblong-obovoid or subglobose, body 14-20 × 11-18 mm, prickly, prickles simple or branched; sepal horns terete or adaxially flattened, 4-12 mm. Flowers 8-12 (-16) cm broad; petals white; stamens ca. 150; filaments pale-yellow to red; pistil 3-4-carpellate. Capsules ovoid to ellipsoid-lanceoloid, 25-45 × 10-16 mm (including stigma and excluding prickles), closely to sparingly prickly, longest prickles 4-6 (-8) mm. Seeds 2-2.5 mm.

Distribution

Ariz., N.Mex., Western North America (United States and Mexico)

Discussion

Subspecies 3 (3 in the flora).

Selected References

None.

Key

1 Capsules closely prickly; bud prickles often branched. Argemone pleiacantha subsp. pleiacantha
1 Capsules sparingly prickly; bud prickles simple. > 2
2 Blades of proximal leaves lobed 4/5 distance to midrib, distal not clasping. Argemone pleiacantha subsp. pinnatisecta
2 Blades of proximal leaves lobed 1/2–2/3 distance to midrib, distal often clasping. Argemone pleiacantha subsp. ambigua

"/3" is not declared as a valid unit of measurement for this property."dm" is not declared as a valid unit of measurement for this property.

... more about "Argemone pleiacantha"
prickly +  and unarmed +
Gerald B. Ownbey +
Greene +
palmate +  and subpalmate +
1×-lobed +, commonly shallowly +  and unlobed +
1.4 cm14 mm <br />0.014 m <br /> (2 cm20 mm <br />0.02 m <br />) +
1.1 cm11 mm <br />0.011 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
2.5 cm25 mm <br />0.025 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
ovoid +  and ellipsoid-lanceoloid +
1 cm10 mm <br />0.01 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
Ariz. +, N.Mex. +  and Western North America (United States and Mexico) +
pale-yellow +  and red +
sessile +, pedicellate +  and symmetric +
conspicuous +
8cm;12cm +
transverse +, poricidal +, valvate +  and dehiscence +
tipped +  and hollow +
subterminal +
paniculate +  and racemose +
terminal +  and axillary +
alternate +  and opposite or whorled +
cauline +  and basal +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
1-2-locular or +  and incompletely completely multilocular +
distinct +
2 times number of sepals +
3-4-carpellate +
branched +  and simple +
Feddes Repert. Spec. Nov. Regni Veg. +
white +  and orange +
carunculate +  and arillate +
subglobose +
2mm +  and 2.5mm +
list +  and count +
list +  and count +
flattened +  and terete +
0.4 cm4 mm <br />0.004 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
3 +  and 2 +
obovate +
Illustrated +
prickly +  and branched +
decumbent +, spreading +  and erect +
persistent +
3-5(-7)-lobed +
persistent +
0 cm0 mm <br />0 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
prickly +  and unarmed +
hispid +, glabrous +  and glaucous +
Argemone pleiacantha +
Argemone +
species +
perennial +  and annual +
3 +  and 2 +