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Parthenium hysterophorus

L. (1753)

This name is accepted

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

false ragweed, santa maria

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Description

Key Characters:

Growth Form:

Stems:

Roots:

Leaves:

Flowers:

Fruit:

Ploidy:

Habitat:

Elevation Range:

Historical Distribution

Images

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Uses and Culture

USES

Natural History

Statewide Status

Naturalized

Island Status

Kaua'i Naturalized
O'ahu Naturalized
Molokai Naturalized
Lana'i Naturalized
Maui Naturalized
Hawai'i Naturalized

Dispersal Agents


Pollinators

Bibliography

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

Other References

Wagner et al. 1990:347 (K, Mo, M, H); Wagner & Herbst 1995:16 (O); Oppenheimer 2016:23 (L); Kari Bogner pers. comm. 2025 (L†, 2023)

Occurrences

SNo. Scientific Name Locality Habitat Basis of Record Recorded By Record Number Island Source Date
1 Parthenium hysterophorus east maui, wailuku district, along haleakala highway A roadside weed. PRESERVED_SPECIMEN hobdy, r.w. collector number: 2323 Maui BISH 4/1/1985
2 Parthenium hysterophorus Maunaloa Town In lawn, by service station. PRESERVED_SPECIMEN Hobdy, R.W. 2368 Molokai BISH 4/23/1985
3 Parthenium hysterophorus East Maui, Wailuku District, along Haleakala Highway A roadside weed. PRESERVED_SPECIMEN Hobdy, R.W. 2323 Maui BISH 4/1/1985
4 Parthenium hysterophorus lower makaha valley roadside (utm 582804, 2373350) ohia, fern; wet PRESERVED_SPECIMEN lau, a. frohlich, d.; oed collector number: 2009020601 Hawaii BISH 2/6/2009
5 Parthenium hysterophorus Ulupalakua, adjacent to Tedeschi Winery, NW of Puu Mahoe PRESERVED_SPECIMEN Imada, C.T. Bily, P.; Puttock, C.F.; Lyons, A.; Brown, J. Collector Number: 2002-33 Maui BISH 7/16/2002
6 Parthenium hysterophorus Koele, across from stables, along unpaved rd to Keahikawelo and Kanepuu In disturbed area; localized but dense infestation PRESERVED_SPECIMEN Oppenheimer, H.L. H31510 Lanai BISH 3/24/2015
7 Parthenium hysterophorus Near Okoe Bay, N of Kapua `A`a lava field. PRESERVED_SPECIMEN Stemmermann, R.L. 7124 Hawaii BISH 10/7/1986
8 Parthenium hysterophorus lihuee district, hoary heads, kipu kai Abundant, weedy composite of disturbed, dry areas. Assoc. with Messerschmidia, Lantana, Scaevola, Lepidium, Sesuvium & Heliotropium. PRESERVED_SPECIMEN herbst, d.r. rice, r.; w.rector; perlman, s. collector number: 2908 Kauai BISH 3/22/1973
9 Parthenium hysterophorus east maui, middle auwahi In middle of jeep road. PRESERVED_SPECIMEN wagner, w.l. mill, s.w.; hobdy, r.; lowry, p.; lowry, h. collector number: 5455 Maui BISH 10/7/1984
10 Parthenium hysterophorus At town entrance, Maunaloa Along roadside. PRESERVED_SPECIMEN Matayoshi, N. s.n. Molokai BISH 7/7/1986
11 Parthenium hysterophorus Lihuee District, Hoary Heads, Kipu Kai Abundant, weedy composite of disturbed, dry areas. Assoc. with Messerschmidia, Lantana, Scaevola, Lepidium, Sesuvium & Heliotropium. PRESERVED_SPECIMEN Herbst, D.R. 2908 Kauai BISH 3/22/1973
12 Parthenium hysterophorus E. Maui, Kanaio. UTM Zone 4: 773550.66, 2282405.51. PRESERVED_SPECIMEN Hank Oppenheimer H120509 Maui PTBG 12/18/2005
13 Parthenium hysterophorus ca. 2.5 mi. s of kailua above kuakini hwy Nr grazed a`a fields with Leucaena leucocephala-Triumfetta semitriloba-Synedrella association. PRESERVED_SPECIMEN nagata, k.m. collector number: 2584 Hawaii BISH 1/14/1983
14 Parthenium hysterophorus Lower Makaha Valley roadside (UTM 582804, 2373350) Dry lowland roadside vegetation PRESERVED_SPECIMEN Lau, A. 2009020601 Oahu BISH 2/6/2009
15 Parthenium hysterophorus Kauai, Waimea Disturbed roadside in town. PRESERVED_SPECIMEN B.A. Bennett 13-0009 Consortium of Pacific Northwest Herbaria 1/18/2013
16 Parthenium hysterophorus koloa district, lawai valley PRESERVED_SPECIMEN flynn, t. collector number: 5597 Hawaii BISH 8/15/1995
17 Parthenium hysterophorus puuwaawaa ranch at base of puuanahulu ridge near mamalahoa hwy PRESERVED_SPECIMEN herbst, d.r. ishikawa, s. collector number: 5394 Hawaii BISH 6/26/1975
18 Parthenium hysterophorus maunaloa town In lawn, by service station. PRESERVED_SPECIMEN hobdy, r.w. collector number: 2368 Molokai BISH 4/23/1985
19 Parthenium hysterophorus Hoary Heads, Kipu Kai. disturbed dry areas. PRESERVED_SPECIMEN Derral Herbst 2908 Kauai PTBG 3/22/1973
20 Parthenium hysterophorus Kapaa, Kapaa Homesteads, Kalnahola Road, across the road to the East of Upper Kapahi Reservoir. Naturalized on roadside. PRESERVED_SPECIMEN Natalia Tangalin 1310 Kauai PTBG 5/30/2007
21 Parthenium hysterophorus Koele, across from Stables, along unpaved road to Keahikawelo and Kanepuu. Disturbed area. PRESERVED_SPECIMEN Hank Oppenheimer H31510 Lanai PTBG 3/24/2015
22 Parthenium hysterophorus Napili. Along Honoapi'ilani Hwy in the vicinity of Pineapple Hill subdivision. PRESERVED_SPECIMEN Hank Oppenheimer H120003 Maui PTBG 12/4/2000
23 Parthenium hysterophorus Poipu, TMK 2-8-15: 82 , 10 acres of undeveloped land located directly to the east of Kapili Road, South of Po`ipu Road,and north of the Sheraton Poipu. Dry shrubland community of secondary non-native vegetation situated on an older Pahoehoe lava flow. PRESERVED_SPECIMEN K. R. Wood 11160 Kauai PTBG 3/24/2003
24 Parthenium hysterophorus Hanamaulu, along Hwy. 56 near Peter Rayno, Sr. Park. PRESERVED_SPECIMEN Tim Flynn 999 Kauai PTBG 2/10/1985
25 Parthenium hysterophorus lihue, field across from kukui grove shopping center PRESERVED_SPECIMEN Kauai US 1/14/2005
26 Parthenium hysterophorus Lawai Valley. Plants of the Allerton Estate at Lawai-Kai. PRESERVED_SPECIMEN Tim Flynn 5597 Kauai PTBG 8/15/1994
27 Parthenium hysterophorus Lower Makaha Valley, roadside. Dry lowland roadside vegetation. PRESERVED_SPECIMEN Alex Lau and Danielle Frohlich 2009020601 Oahu PTBG 2/6/2009
28 Parthenium hysterophorus Hwy 56, growing from curb ca. 1/4 mile S. of Kaua'i Hilton (Kauai Beach Resort), makai side of road. PRESERVED_SPECIMEN Lynwood Hume 498 Kauai PTBG 3/21/1990
29 Parthenium hysterophorus Waianae Range, Lualualei, antenna field. Lowland dry habitat of kiawe, koa haole, grasses, and located next to Marsilea villosa. PRESERVED_SPECIMEN Bolling, M. WMWP 04 Oahu BISH 3/27/2014
30 Parthenium hysterophorus hanamaulu, along hwy.56 near peter rayno, sr. park PRESERVED_SPECIMEN flynn, t. collector number: 999 Kauai BISH 11/10/1985
31 Parthenium hysterophorus Hwy. 56, ca. 0.25 mi S of Kauai Hilton, makai side of road Growing from curb. PRESERVED_SPECIMEN Hume, L. 498 Kauai BISH 3/21/1990
32 Parthenium hysterophorus East Maui, Wailuku District, along Haleakala Highway near 2 mile mark PRESERVED_SPECIMEN Hobdy, R.W. 1753 Maui BISH 4/19/1983
33 Parthenium hysterophorus Poipu, 10 acres of undeveloped land located directly to the east of Kapili Road, south of Po'ipu Road and north of the Sheraton Poipu. PRESERVED_SPECIMEN K. R. Wood 11160 Kauai US 3/24/2003
34 Parthenium hysterophorus kealakekua ranch PRESERVED_SPECIMEN kawasaki, a. collector number: s.n. Hawaii BISH 6/3/1960
35 Parthenium hysterophorus Puuwaawaa Remnant dryland forest. PRESERVED_SPECIMEN Nagata, K.M. 3706 Hawaii BISH 10/4/1987
36 Parthenium hysterophorus Kealakekua Ranch PRESERVED_SPECIMEN Kawasaki, A. s.n. Hawaii BISH 6/3/1960
37 Parthenium hysterophorus hwy. 56, ca. 0.25 mi. s of kauai hilton, makai side of road Growing from curb. PRESERVED_SPECIMEN hume, l. collector number: 498 Kauai BISH 3/21/1990
38 Parthenium hysterophorus Wheeler Army Airfield. Enter via Lyman Gate, turn right when able and wrap around until parallel with Kunia Road; drive between buildings and fence/hwy; go through chain gate; just past is a dirt pile. Soil pile contained several plants not frequently found on Wheeler Base. No canopy directly above. Other taxa in area include Spathodea campanulata, Leucaena leucocephala, Macaranga tanarius, Aleurites moluccana, Ficus spp. Understory: various grasses and herbs, mowed into a lawn: Urochloa maxima, Boerhavia coccinea, Chloris barbata, C. gayana. PRESERVED_SPECIMEN Beachy, J. USARMY 462 Oahu BISH 2/13/2017
39 Parthenium hysterophorus at town entrance, maunaloa PRESERVED_SPECIMEN matayoshi, n. collector number: s.n. Hawaii BISH 7/7/1986
40 Parthenium hysterophorus Koloa District, Lawai Valley Plants of the Allerton Estate at Lawai-Kai. PRESERVED_SPECIMEN Flynn, T. 5597 Kauai BISH 8/15/1995
41 Parthenium hysterophorus Ca. 2.5 mi S of Kailua above Kuakini Hwy Nr grazed a`a fields with Leucaena leucocephala-Triumfetta semitriloba-Synedrella association. PRESERVED_SPECIMEN Nagata, K.M. 2584 Hawaii BISH 1/14/1983
42 Parthenium hysterophorus Hanamaulu, along Hwy.56 near Peter Rayno, Sr. Park PRESERVED_SPECIMEN Flynn, T. 999 Kauai BISH 11/10/1985
43 Parthenium hysterophorus Ulupalakua, adjacent to Tedeschi Winery, NW of Puu Mahoe PRESERVED_SPECIMEN Imada, C.T. 2002-33 Maui BISH 7/16/2002
44 Parthenium hysterophorus east maui, wailuku district, along haleakala highway near 2 mile mark PRESERVED_SPECIMEN hobdy, r.w. collector number: 1753 Maui BISH 4/19/1983
45 Parthenium hysterophorus Along Diamond Head Road at the turnoff into the crater. PRESERVED_SPECIMEN Funk, E.J. s.n. Oahu BISH 7/17/1990
46 Parthenium hysterophorus ulupalakua, adjacent to tedeschi winery, nw of puu mahoe PRESERVED_SPECIMEN imada, c.t. bily, p.; puttock, c.f.; lyons, a.; brown, j. collector number: 2002-33 Maui BISH 7/16/2002
47 Parthenium hysterophorus East Maui, middle Auwahi In middle of jeep road. PRESERVED_SPECIMEN Wagner, W.L. 5455 Maui BISH 10/7/1984
48 Parthenium hysterophorus near okoe bay, n of kapua `A`a lava field. PRESERVED_SPECIMEN stemmermann, r.l. collector number: 7124 Hawaii BISH 10/7/1986
49 Parthenium hysterophorus Hawai???????i Volcanoes National Park, Hawaii National Park, HI, US PRESERVED_SPECIMEN K. R. Wood 11160 Oahu HAPI 3/24/2003
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