Ambrosia eriocentra

(A. Gray) W. W. Payne

J. Arnold Arbor. 45: 423. 1964.

IllustratedEndemic
Basionym: Franseria eriocentra A. Gray Proc. Amer. Acad. Arts 7: 355. 1868
Treatment appears in FNA Volume 21. Treatment on page 13. Mentioned on page 10, 11.

Shrubs, 30–80 (–120+) cm. Stems erect. Leaves mostly alternate; petioles 0–2 mm; blades (± white abaxially) elliptic, lance-linear, or rhombic, 10–40 (–60) × 5–15 (–40) mm, bases ± cuneate, margins irregularly toothed to ± laciniate, abaxial faces densely strigillose, adaxial faces tomentulose and pilosulous. Pistillate heads clustered, proximal to staminates; florets 1. Staminate heads: peduncles 0–0.5 mm; involucres saucer-shaped to shallowly cupshaped, 4–8+ mm diam., tomentulose and/or pilose; florets 12–25+. Burs: bodies obconic to fusiform, 3–5+ mm, densely villous and stipitate-glandular, spines 12–20+, scattered or mostly distal, ± subulate, 3–4 mm, tips straight. 2n = 36.


Phenology: Flowering Apr–May(–Jul).
Habitat: Sandy and gravelly washes
Elevation: 700–1700 m

Distribution

V21-9-distribution-map.gif

Ariz., Calif., Nev., Utah.

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Ambrosia eriocentra"
pilosulous +  and tomentulose +
not tailed +, rounded +  and obtuse +
coherent +  and distinct +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
spiciform +, racemiform +, paniculiform +, glomerate +  and corymbiform +
indeterminate +  and determinate +
John L. Strother +
(A. Gray) W. W. Payne +
cuneate +
Franseria eriocentra +
compound +  and simple +
4 cm40 mm <br />0.04 m <br /> (6 cm60 mm <br />0.06 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (4 cm40 mm <br />0.04 m <br />) +
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
rhombic;lance-linear;rhombic;lance-linear +
5mm;15mm +
winged;ribbed;winged;ribbed +
stipitate-glandular +  and villous +
tuberculate +  and rugose +
obconic;fusiform +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
barbellulate +  and barbellate +
purplish +  and whitish +
villous +, strigillose +, hispidulous +, glabrous +  and warty +
tuberculate +
globose +  and obovoid pyramidal pyriform obconic or fusiform +
fertile +  and bisexual +
Ariz. +, Calif. +, Nev. +  and Utah. +
700–1700 m +
stipitate-glandular +, glabrate +  and hairy +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Sandy and gravelly washes +
staminate +  and pistillate +
in corymbiform , glomerate , paniculiform , racemiform or spiciform , arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
membranous +  and scarious +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
pilose +  and tomentulose +
saucer-shaped;shallowly cupshaped +
conspicuous +
petiolate +  and sessile +
incurved;erect +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
irregularly toothed +  and more or less laciniate +
connate +  and distinct +
2-carpellate +
stipitate-glandular +, hirtellous +  and villous +
spatulate;linear +
membranous +
persistent +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
0 cm0 mm <br />0 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Flowering Apr–May(–Jul). +
5 +  and 16 +
unequal +  and subequal +
J. Arnold Arbor. +
bearing subulate enations +, hairy +  and bristly +
convex;flat +
exalbuminous +
Illustrated +  and Endemic +
12 (?) +  and 20 (?) +
subulate +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
prostrate +  and decumbent +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Franseria +  and Hymenoclea +
Ambrosia eriocentra +
Ambrosia +
species +
campanulate +  and cylindric +
straight +
toothed +  and entire +
perennial +  and annual +
10 cm100 mm <br />0.1 m <br /> (400 cm4,000 mm <br />4 m <br />) +