Ambrosia chenopodiifolia

(Bentham) W. W. Payne

J. Arnold Arbor. 45: 419. 1964.

Basionym: Franseria chenopodiifolia Bentham Bot. Voy. Sulphur, 26. 1844
Treatment appears in FNA Volume 21. Treatment on page 14. Mentioned on page 11.

Shrubs, 30–80+ cm. Stems erect. Leaves mostly alternate; petioles 5–20 mm; blades ovate to rounded-deltate, 20–35 (–50) × 18–30 (–45) mm, bases broadly cuneate to ± truncate, margins toothed, abaxial faces ± densely tomentulose (between veins), adaxial faces sparsely tomentulose, glabrescent. Pistillate heads clustered, proximal to staminates; florets 2 (–3). Staminate heads: peduncles 0–3 mm; involucres ± cupshaped, 3–5 mm diam., tomentulose; florets 12–20+. Burs: bodies obconic to fusiform, 4–6 mm, tomentulose (little, if at all, stipitate-glandular), spines 15–20+, scattered or on distal 1/2, ± subulate (the proximal basally flattened), 2–3 mm, tips usually uncinate, sometimes straight. 2n = 72.


Phenology: Flowering Mar–Apr.
Habitat: Clays or sandy soils, among lava rocks
Elevation: 50–200 m

Distribution

V21-11-distribution-map.gif

Calif., Mexico (Baja California), Mexico (Baja California Sur)

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Ambrosia chenopodiifolia"
glabrescent +  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 +
(Bentham) W. W. Payne +
broadly cuneate +  and more or less truncate +
Franseria chenopodiifolia +
compound +  and simple +
3.5 cm35 mm <br />0.035 m <br /> (5 cm50 mm <br />0.05 m <br />) +
3 cm30 mm <br />0.03 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
2 cm20 mm <br />0.02 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
ovate;rounded-deltate +
18mm;30mm +
winged;ribbed;winged;ribbed +
tomentulose +
tuberculate +  and rugose +
obconic;fusiform +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 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 +
Calif. +, Mexico (Baja California) +  and Mexico (Baja California Sur) +
50–200 m +
stipitate-glandular +, glabrate +  and hairy +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Clays or sandy soils, among lava rocks +
staminate +  and pistillate +
in corymbiform , glomerate , paniculiform , racemiform or spiciform , arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
membranous +  and scarious +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
cup-shaped +
conspicuous +
petiolate +  and sessile +
incurved;erect +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
connate +  and distinct +
2-carpellate +
stipitate-glandular +, hirtellous +  and villous +
spatulate;linear +
membranous +
persistent +
0 cm0 mm <br />0 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Flowering Mar–Apr. +
5 +  and 16 +
unequal +  and subequal +
J. Arnold Arbor. +
bearing subulate enations +, hairy +  and bristly +
convex;flat +
exalbuminous +
on distal 1/2 +  and scattered +
15 (?) +  and 20 (?) +
subulate +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
prostrate +  and decumbent +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Franseria +  and Hymenoclea +
Ambrosia chenopodiifolia +
Ambrosia +
species +
campanulate +  and cylindric +
straight +
uncinate +
toothed +  and entire +
perennial +  and annual +
10 cm100 mm <br />0.1 m <br /> (400 cm4,000 mm <br />4 m <br />) +