Amaranthus palmeri

S.Watson (1877)

This name is accepted

Kingdom: Viridiplantae Phylum: Magnoliophyta Class/Clade: Eudicot-CoreEudicot Order: Caryophyllales Family: Amaranthaceae Genus: Amaranthus

Palmer's amaranth

Description

Key Characters:

Growth Form:

Stems:

Roots:

Leaves:

Flowers:

Fruit:

Ploidy:

Habitat:

Elevation Range:

Historical Distribution

Uses and Culture

USES

Natural History

Statewide Status

Naturalized

Island Status

O'ahu Naturalized
Maui Potentially naturalizing

Dispersal Agents


Pollinators

Bibliography

Name Published In: Proc. Amer. Acad. Arts 12: 274 (1877)

Other References

Faccenda & Ross 2024:26, 30 (NEWNAT/O, DESCR, KEY); Faccenda, Arthur, et al. 2025:152 (EM)

Occurrences

SNo. Scientific Name Locality Habitat Basis of Record Description Recorded By Record Number Island Source Date
1 Amaranthus palmeri Kapiolani Community College, between Kopiko and Koa B Growing underneath a Ficus tree in a weedy area near the dumpster behind Koa Building. Not irrigated, partial sun, area regularly weed whacked. Preserved_Specimen Annual herb, dioecious, erect, ca. 8-11 cm. tall. Three plants were observed, one male and two female palnts. Ross, M.C. 1917 Oahu BISH 2023-03-23
2 Amaranthus palmeri Kaonoulu, Kihei, along Piilani Highway in soft soil recently disturbed by a large trenching machine that was burying fiberoptic cable. The machine likely came from the Mainland. Preserved_Specimen Just 3 plants found along the highway// Male [K. Faccenda 2024] Hobdy, R.W. 4295 Maui BISH 2008-06-08
3 Amaranthus palmeri Algaroba Street, near intersection with Makahiki Way, Honolulu Growing in dirt near the sidewalk. Preserved_Specimen Annual herb, dioecious, mostly erect, slightly decumbent, ca. 15-20 cm. tall; male. Only one plant observed Ross, M.C. 1860 Oahu BISH 2022-12-12
4 Amaranthus palmeri Kaimuki, Pukalani Pl. Weedy roadside, dry, sunny Preserved_Specimen Single plant seen Faccenda, K. 3054 Oahu BISH 2023-03-04
5 Amaranthus palmeri East Maui, Kamaole, along Piilani Highway Preserved_Specimen erect plants to 1 meter tall, ascending branches with long terminal, congested panicles. Leaves rhombic on long petioles, glabrous, pale whitish beneath.//male plant [K. Faccenda 2024] Hobdy, R.W. Maui BISH 2008-06-06
6 Amaranthus palmeri Kihei, weedy area behind Department of Motor Vehicles on E. Lipoa St Edge of shaded and partially tended lawn Preserved_Specimen Two individuals seen at this site, more plants seen in bulldozed area 1 km north. Plants may have been introduced as bird seed contaminant as seed is regularly thrown for chickens as grain sorghum was also seen volunteering at this site Starmer, J. Maui BISH 2024-03-22
7 Amaranthus palmeri Kaimuki, intersection of Keanu St. and 15th Weed spotted along sidewalk. Dry, sunny area Preserved_Specimen Two plants seen. Bracts conspicuously distichous Faccenda, K. 3053.5 Oahu BISH 2023-03-04
8 Amaranthus palmeri Kapiolani Community College, Makapuu Avenue, near bus stop. Growing underneath a Samanea saman tree in a weedy area near the bus stop on Makapuu Avenue. Not irrigated, partial sun, lots of feral chickens in the area. Preserved_Specimen Annual herb, dioecious, erect, ca. 20-25 cm. tall; 2 plants observed. Ross, M.C. 1921 Oahu BISH 2023-03-28
9 Amaranthus palmeri Kaonoulu, Kihei, along Piilani Highway, near the Alanui Kealii intersection plants found where a large trenching machine had been used to bury fiber optic cable (machine likely came from the Mainland) Preserved_Specimen 3 plants: branching shrub with ascendent branches topped by narrow spike-like inflorescences. Plants ranged from 0.6 to 1.3 m tall. Hobdy, R.W. 4296 Maui BISH 2008-06-08
10 Amaranthus palmeri Kihei, weedy area behind Department of Motor Vehicles on E. Lipoa St Edge of shaded and partially tended lawn Preserved_Specimen Two individuals seen at this site, more plants seen in bulldozed area 1 km north. Plants may have been introduced as bird seed contaminant as seed is regularly thrown for chickens as grain sorghum was also seen volunteering at this site Starmer, J. Maui BISH 2024-03-22