Amaranthus retroflexus
American pigweed
Photo: (c) Alexander Rumpel, some rights reserved (CC BY-NC), uploaded by Alexander Rumpel (iNaturalist)
4
Bishop specimens
0
Type specimens
1939
First collected
2023
Last collected
2023
Last seen alive in Hawaiʻi
In the Library
Bishop Museum publications whose pages name Amaranthus retroflexus, most mentions first.
2024
Records of the Hawaii Biological Survey for 2024: VolumeEvenhuis, N.L. & Eldredge, L.G. (eds) · Records of the Hawaii Biological Survey · 2 pages
2019
Hawaiian naturalized vascular plants checklist (February 2019 update)Imada, C. · Contribution to the Hawaii Biological Survey · 2 pages
2025
Imada, C.T., Faccenda, K., Thomas, M.K., Gallaher, T., Oppenhemier, H., Kennedy, B. & Kalei, A. (eds.) Hawaiian native & naturalized vascular plants checklist (2025 update). 780 pp. [published online 6 November 2025]· Contribution to the Hawaii Biological Survey · 1 page
1997
Contributions to the flora of HawaiiWagner, W.L. & R.T. Shannon · Contribution to the Hawaii Biological Survey · 1 page
Two centuries of collecting
The oldest Bishop specimen was collected in 1939 by Schaffer, C. (Linhamn).
From the collection
Alive today
8 research-grade iNaturalist sightings in the wild in Hawaiʻi since 2000. Most recent first.
2023-10-29
Honolulu, Hawaii, United States
(c) Mike Ross, some rights reserved (CC BY-NC)
2023-06-30
Honolulu County, HI, USA
(c) Mike Ross, some rights reserved (CC BY-NC)
2023-03-20
Honolulu, Hawaii, United States
(c) Mike Ross, some rights reserved (CC BY-NC)
2023-03-07
Honolulu, Hawaii, United States
(c) Kevin Faccenda, some rights reserved (CC BY)
2023-02-18
Honolulu, Hawaii, United States
(c) Kevin Faccenda, some rights reserved (CC BY)
2022-12-12
Ala Moana, Honolulu, HI, USA
(c) Mike Ross, some rights reserved (CC BY-NC)
2022-11-07
Makiki/Lower/ Punchbowl/Tantalus, Honolulu, HI, USA
(c) Mike Ross, some rights reserved (CC BY-NC)
2020-08-10
Makiki/Lower/ Punchbowl/Tantalus, Honolulu, HI, USA
(c) Kevin Faccenda, some rights reserved (CC BY)