Ambrosia dumosa
J. Arnold Arbor. 45: 422. 1964.
Common names: Bursage
Basionym: Franseria dumosa A. Gray in J. C. Frémont, Rep. Exped. Rocky Mts., 316. 1845
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

Ariz., Calif., Nev., Utah, Mexico (Baja California), Mexico (Sonora)
Discussion
Selected References
None.
Lower Taxa
None.
... more about "Ambrosia dumosa"
introrse +
herbaceous +
scarious +
absent +
hirsute +
papillate +
continuous +
decurrent +
lobed;ovate;elliptic +
8mm;15mm +
winged;ribbed;winged;ribbed +
pilosulous +
globose +
1;15 +
stigmatic +
? (?) +
absent +
Bursage +
zygomorphic +
absent +
winged +
dimorphic +
enclosed +
tuberculate +
hard +
staminate +
straight +
distinct +
proximal +
8;15 +
bisexual +
dispersed +
singly +
discoid +
indeterminate +
surrounding +
strigillose +
cup-shaped +
conspicuous +
alternate +
cauline +
incurved;erect +
deltate +
herbaceous +
2-carpellate +
inferior +
attached +
anatropous +
spatulate;linear +
membranous +
persistent +
falling +
absent +
tough +
thick +
absent +
connate +
persistent +
connate +
falling +
J. Arnold Arbor. +
1964 +
pistillate +
absent +
fertile +
paleate +
convex;flat +
fibrous +
exalbuminous +
modifed +
1;1;8 +
scattered +
subulate +
alternate +
connate +
branched +
erect +
absent +
2-branched +
papillate +
Ambrosia dumosa +
Ambrosia +
species +
straight +
free +
longer +