Argemone polyanthemos

(Fedde) G. B. Ownbey

Mem. Torrey Bot. Club 21: 128. 1958.

EndemicIllustrated
Basionym: Argemone intermedia var. polyanthemos Fedde in H. G. A. Engler, Pflanzenr. 40[IV,104]: 283. 1909
Treatment appears in FNA Volume 3.

Plants annual or biennial. Stems 4-8 (-12) dm, sparingly prickly. Leaf-blades: abaxial surface scattered-prickly on main veins, adaxial surface unarmed; proximal lobed 2/3 distance to midrib; distal clasping. Inflorescences: buds ellipsoid-oblong, body 15-22 × 10-15 mm, sparingly prickly; sepal horns terete, 6-10 (-15) mm, usually unarmed. Flowers 7-10 cm broad, usually closely subtended by 1-2 foliaceous bracts; petals white, very rarely lavender; stamens 150 or more; filaments lemon yellow; pistil 3-4-carpellate. Capsules narrowly to broadly ellipsoid, 35-50 × 10-17 mm (including stigma and excluding prickles), prickly, surface clearly visible, prickles widely spaced, longest 4-10 (-12) mm, interspersed with a few shorter ones. Seeds ca. 2 mm. 2n = 28.


Phenology: Flowering spring–summer; fruiting late spring–summer.
Habitat: Prairies, foothills and mesas
Elevation: 300-2300 m

Distribution

V3 881-distribution-map.gif

Colo., Kans., Mont., Nebr., N.Mex., N.Dak., Okla., S.Dak., Tex., Utah, Wyo.

Discussion

Argemone polyanthemos is introduced in Utah.

Selected References

None.

Lower Taxa

None.

"longest" is not a number."dm" 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 polyanthemos"
Gerald B. Ownbey +
(Fedde) G. B. Ownbey +
Argemone intermedia var. polyanthemos +
palmate +  and subpalmate +
1×-lobed +, commonly shallowly +  and unlobed +
1.5 cm15 mm <br />0.015 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
ellipsoid-oblong +
3.5 cm35 mm <br />0.035 m <br /> (5 cm50 mm <br />0.05 m <br />) +
ellipsoid +
1 cm10 mm <br />0.01 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
Colo. +, Kans. +, Mont. +, Nebr. +, N.Mex. +, N.Dak. +, Okla. +, S.Dak. +, Tex. +, Utah +  and Wyo. +
300-2300 m +
sessile +, pedicellate +  and symmetric +
conspicuous +
7 cm70 mm <br />0.07 m <br /> (10 cm100 mm <br />0.1 m <br />) +
transverse +, poricidal +, valvate +  and dehiscence +
Prairies, foothills and mesas +
tipped +  and hollow +
subterminal +
paniculate +  and racemose +
terminal +  and axillary +
alternate +  and opposite or whorled +
cauline +  and basal +
1-2-locular or +  and incompletely completely multilocular +
distinct +
obovate +
2 times number of sepals +
Flowering spring–summer +  and fruiting late spring–summer. +
3-4-carpellate +
1 cm10 mm <br />0.01 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Mem. Torrey Bot. Club +
white +  and orange +
carunculate +  and arillate +
subglobose +
2 cm20 mm <br />0.02 m <br /> (?) +
list +  and count +
list +  and count +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
3 +  and 2 +
obovate +
W2 +, Endemic +  and Illustrated +
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 polyanthemos +
Argemone +
species +
biennial +  and annual +
3 +  and 2 +