Ambrosia artemisiifolia

L. (1753)

This name is accepted

Kingdom: Viridiplantae Phylum: Magnoliophyta Class/Clade: Eudicot-Asterids Order: Asterales Family: Asteraceae Genus: Ambrosia

ambrosia, common ragweed

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Description

Key Characters:

Growth Form:

Stems:

Roots: Roots a tap root.

Leaves: Leaves simple. Alternate or opposite. Blades deltate, elliptic, lanceolate, or ovate Apex acute. Base attenuate or cuneate (wedge-shaped). Margins bipinnatifid, deeply lobed or dissected, pinnately lobed.

Flowers:

Fruit:

Ploidy:

Habitat:

Elevation Range:

Historical Distribution

Images

Uses and Culture

USES

Natural History

Statewide Status

Naturalized

Island Status

O'ahu Not in flora
Molokai Not in flora
Maui Not in flora
Hawai'i Naturalized

Dispersal Agents


Pollinators

Bibliography

Name Published In: Sp. Pl.: 988 (1753)

Other References

Wagner et al. 1990:256 (O, Mo, M, H); Strother 2006b/Faccenda, Arthur, et al. 2025:159 (remove O, Mo, M [re-IDed as A. confertiflora], KEY)

Occurrences

SNo. Scientific Name Locality Habitat Basis of Record Description Recorded By Record Number Island Source Date
1 Ambrosia artemisiifolia Junction of Mamalahoa Highway & the Saddle Road Preserved_Specimen Herbst, D.R. 5313 Hawaii BISH 1975-05-20
2 Ambrosia artemisiifolia North Kohala District Land of Kapaanui, along Highway 27 Preserved_Specimen Herb with gray-green foliage, yellow flowers. Herbst, D.R. 5617 Hawaii BISH 1976-01-19
3 Ambrosia artemisiifolia Ewa Preserved_Specimen Forbes, C.N. 1754 Oahu BISH 1912-02-16
4 Ambrosia artemisiifolia North Kohala District Land of Kapaanui, along Highway 27 Preserved_Specimen Herb with gray-green foliage, yellow flowers. Herbst, D.R. 5617 Hawaii BISH 1976-01-19
5 Ambrosia artemisiifolia Near junction of Belt & Saddle Roads Preserved_Specimen Degener, O. 34851 Hawaii BISH 1968-09-05
6 Ambrosia artemisiifolia Parker Ranch, beyond Waimea In the dry section Preserved_Specimen Hosaka, E.Y. Hawaii BISH
7 Ambrosia artemisiifolia Near Ewa Preserved_Specimen Forbes, C.N. 1915 Oahu BISH 1914-07-01
8 Ambrosia artemisiifolia Ewa Preserved_Specimen Forbes, C.N. 1754 Oahu BISH 1912-02-16
9 Ambrosia artemisiifolia Oahu Sugar Co Preserved_Specimen Lyon, H.L. Oahu BISH 1933-08-09
10 Ambrosia artemisiifolia Near Ewa Preserved_Specimen Forbes, C.N. 1915 Oahu BISH 1914-07-01
11 Ambrosia artemisiifolia Hamakua District; Pohakuloa Training Area; along the Saddle Road Collected between the 30 & 45 mile markers, within 60 ft of the road. Preserved_Specimen Funk, E.J. Hawaii BISH 1990-12-13
12 Ambrosia artemisiifolia Hawaii National Park, Byron Camp Waste grounds Preserved_Specimen Degener, O. 5595 Hawaii BISH 1929-10-01
13 Ambrosia artemisiifolia Pasture near Puu Pa, South Kohala District Growing in scrub grassland with Pennisetum setaceum and Sporobolus africanus. Preserved_Specimen Small herb about 6 inches tall. Cuddihy, L.W. 904 Hawaii BISH 1981-10-14
14 Ambrosia artemisiifolia Kamuela Pasture Preserved_Specimen Ewart III, G.R. 295 Hawaii BISH 1932-01-16
15 Ambrosia artemisiifolia S. Kohala, Puu Holoholoku, 2 miles southeast of Kamuela airport Growing near base of cinder cone. Growing with Dodonaea, Osteomeles, Chenopodium, Lipochaeta and fountain grass. Preserved_Specimen Uncommon herb. Leaves strongly scented. Davis, J. 594 Hawaii BISH 1981-09-10
16 Ambrosia artemisiifolia Kawaihae, DHHL Survey, Supp. Sta. P Open pasture with shrubs, Lantana, Rhynchelytrum repens, Chamaecrista nictitans. Preserved_Specimen Plants 2-2.5 ft. high with flowers Perlman, S. 10288 Hawaii BISH 1989-08-04
17 Ambrosia artemisiifolia South Kohala, Waimea Puu Holoholoku paddock Preserved_Specimen Slender upright 1-4 ft., abundant Hosaka, E.Y. 2113 Hawaii BISH 1938-05-25