Ambrosia dumosa

(A. Gray) W. W. Payne

J. Arnold Arbor. 45: 422. 1964.

Common names: Bursage
Basionym: Franseria dumosa A. Gray in J. C. Frémont, Rep. Exped. Rocky Mts., 316. 1845
Treatment appears in FNA Volume 21. Treatment on page 13. Mentioned on page 10, 12.

Shrubs, 10–40 (–60+) cm. Stems erect. Leaves mostly alternate; petioles 2–8 (–12+) mm; blades (white) ovate to elliptic, 10–25 (–45) × 8–15 (–30) mm, (1–) 2–3-pinnately lobed, abaxial and adaxial faces densely strigillose. Pistillate heads intermixed with staminates (sometimes wanting or staminates sometimes wanting, plants unisexual); florets (1–) 2. Staminate heads: peduncles 0–1 (–2) mm; involucres shallowly cupshaped, 3–5 mm diam., ± strigillose; florets 8–15+. Burs: bodies ± globose, 3–5+ mm, pilosulous and/or glanddotted, spines 12–25+, scattered, ± subulate (± navicular at bases), 2–4 mm, tips straight. 2n = 36, 72, 108, 126.


Phenology: Flowering Mar–May(–Dec).
Habitat: Rocky or sandy washes, benches
Elevation: (-100–)100–1200(–1500) m

Distribution

V21-8-distribution-map.gif

Ariz., Calif., Nev., Utah, Mexico (Baja California), Mexico (Sonora)

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Ambrosia dumosa"
126 +, 108 +, 72 +  and 36 +
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 +
decurrent +
Franseria dumosa +
compound +  and simple +
2.5 cm25 mm <br />0.025 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (3 cm30 mm <br />0.03 m <br />) +
1 cm10 mm <br />0.01 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
lobed;ovate;elliptic +
8mm;15mm +
winged;ribbed;winged;ribbed +
pilosulous +
tuberculate +  and rugose +
globose +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
barbellulate +  and barbellate +
Bursage +
purplish +  and whitish +
villous +, strigillose +, hispidulous +, glabrous +  and warty +
tuberculate +
globose +  and obovoid pyramidal pyriform obconic or fusiform +
fertile +  and bisexual +
Ariz. +, Calif. +, Nev. +, Utah +, Mexico (Baja California) +  and Mexico (Sonora) +
(-100–)100–1200(–1500) m +
stipitate-glandular +, glabrate +  and hairy +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Rocky or sandy washes, benches +
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 +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
Flowering Mar–May(–Dec). +
5 +  and 16 +
unequal +  and subequal +
J. Arnold Arbor. +
bearing subulate enations +, hairy +  and bristly +
convex;flat +
exalbuminous +
12 (?) +  and 25 (?) +
subulate +
0.2 cm2 mm <br />0.002 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 dumosa +
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 />) +