Gutierrezia arizonica

(A. Gray) M. A. Lane

Sida 8: 313. 1980.

Common names: Arizona snakeweed
Basionyms: Greenella arizonica A. Gray Proc. Amer. Acad. Arts 16: 81. 1880
Synonyms: Xanthocephalum arizonicum (A. Gray) Shinners
Treatment appears in FNA Volume 20. Treatment on page 90. Mentioned on page 89.

Annuals, 12–30 cm. Stems glabrous. Leaves: basal sometimes persistent, proximal usually absent at flowering; cauline blades 1-nerved, narrowly elliptic-oblanceolate to elliptic-lanceolate, 1–2 mm wide, reduced distally. Heads borne singly or in loose, open arrays. Involucres campanulate, 4–7 mm diam. Phyllary apices flat. Ray-florets 8–15; corollas white, drying light yellow or reddish, 6–7.5 mm. Disc-florets (16–) 20–30 (–40). Cypselae 0.9–1.6 mm, faces without oil cavities, densely strigoso-sericeous (hair apices prominently bulbous-capitate); pappi coroniform or of 1 series of basally connate scales 0.1–0.3 mm (obscured by cypsela indument). 2n = 8.


Phenology: Flowering (Feb–)Mar–May.
Habitat: Sandy or sandy-rocky plains or washes
Elevation: 200–1300 m

Discussion

Selected References

None.

Lower Taxa

None.

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

... more about "Gutierrezia arizonica"
hirtellous +, hispidulous +  and glabrous +
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
Guy L. Nesom +
(A. Gray) M. A. Lane +
decurrent +
white-indurate +
Greenella arizonica +
compound +  and simple +
linear;lanceolate or spatulate +
rugulose +  and muricate +
barbellulate +  and barbellate +
narrowly elliptic-oblanceolate +  and elliptic-lanceolate +
Arizona snakeweed +
not 2-lipped +  and actinomorphic +
reddish +, light yellow +, drying +  and white +
0.6 cm6 mm <br />0.006 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
not compressed +, cylindric +  and clavate +
fertile +  and bisexual +
fertile +  and bisexual +
Ariz. +  and Mexico (Sonora) +
200–1300 m +
resinous +
gland-dotted +
strigoso-sericeous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Sandy or sandy-rocky plains or washes +
in loose , open arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
campanulate +
petiolate +  and sessile +
cauline +  and basal +
short-deltate +
2-carpellate +
erose-margined +
persistent +
of 1 series +  and coroniform +
Flowering (Feb–)Mar–May. +
3-nerved +  and 1-nerved +
ovate +  and lanceolate +
bearing subulate enations +, hairy +  and bristly +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
exalbuminous +
erect +  and ascending +
appendaged +  and truncate +
papillate +  and smooth +
Xanthocephalum arizonicum +
Gutierrezia arizonica +
Gutierrezia +
species +
150 cm1,500 mm <br />1.5 m <br /> (200 cm2,000 mm <br />2 m <br />) +
12 cm120 mm <br />0.12 m <br /> (30 cm300 mm <br />0.3 m <br />) +