Argemone arizonica

G. B. Ownbey

Mem. Torrey Bot. Club 21: 91. 1958.

Conservation concernEndemicIllustrated
Treatment appears in FNA Volume 3.

Plants perennial. Stems 5-8 dm, diffusely branched, often decumbent, copiously long-prickly. Leaf-blades: surfaces sparingly long-prickly on veins; basal and proximal lobed nearly to midrib, lobe length often to 5 times width; distal not clasping. Inflorescences: buds ellipsoid-oblong, body 15-18 × 12-15 mm, prickly; sepal horns slender, terete, 12-15 mm, prickly at base. Flowers 7-10 cm broad; petals white; stamens 100 or more; filaments pale-yellow; pistil 3-carpellate. Capsules narrowly ellipsoid-oblong, 35-45 × 10-14 mm (including stigma and excluding prickles), closely prickly, longest prickles 8-10 mm. Seeds ca. 2 mm.


Phenology: Flowering spring; fruiting summer.
Habitat: Precipitous slopes
Elevation: 1000-2000 m

Discussion

Of conservation concern.

Argemone arizonica grows well in Grand Canyon National Park, especially along the Kaibab and Bright Angel trails.

Selected References

None.

Lower Taxa

None.

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

... more about "Argemone arizonica"
Gerald B. Ownbey +
G. B. Ownbey +
palmate +  and subpalmate +
1×-lobed +, commonly shallowly +  and unlobed +
1.5 cm15 mm <br />0.015 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
1.2 cm12 mm <br />0.012 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
ellipsoid-oblong +
3.5 cm35 mm <br />0.035 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
ellipsoid-oblong +
1 cm10 mm <br />0.01 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
1000-2000 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 +
Precipitous slopes +
tipped +  and hollow +
subterminal +
paniculate +  and racemose +
terminal +  and axillary +
proximal +  and basal +
alternate +  and opposite or whorled +
cauline +  and basal +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
1-2-locular or +  and incompletely completely multilocular +
distinct +
obovate +
2 times number of sepals +
Flowering spring +  and fruiting summer. +
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 +
1.2 cm12 mm <br />0.012 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
3 +  and 2 +
obovate +
Conservation concern +, Endemic +  and Illustrated +
long-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 />) +
hispid +, glabrous +  and glaucous +
Argemone arizonica +
Argemone +
species +
3 +  and 2 +