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Eucalyptus paniculata

Sm. (1797)

This name is accepted

Kingdom: Viridiplantae Phylum: Magnoliophyta Class/Clade: Eudicot-Rosids Order: Myrtales Family: Myrtaceae Genus: Eucalyptus

gray ironbark

Description

Key Characters:

Growth Form: Trees 30–50 m tall.

Stems: Bark pale gray, rough, hard, furrowed throughout.

Roots:

Leaves: Leaves simple. Adult Alternate. Blades lanceolate, 9.5–15 cm long, 1.2–2.4 cm wide. Apex acuminate. Blades discolorous. Margins entire. Petioles 13–22 mm long. Stipules vestigial or absent.

Flowers: Flowers 7 in umbels arranged in terminal, paniculate inflorescences, sometimes axillary and simple, peduncles 6–16 mm long, pedicels quadrangular, 2–10 mm long. buds obovoid to fusiform, 7–9 mm long, 3–5 mm wide. Flowers bisexual (perfect), actinomorphic. Calyx modified into an operculum; operculum conical, narrower than hypanthium. Stamens numerous, in several whorls; anthers dithecal. Ovary inferior; ovule placentation axile.

Fruit: Fruit hemispherical; obconical; obovoid; or subpyriform; 6–8 mm long; 5–8 mm wide; valves 4–5; level or included. Seeds numerous.

Ploidy: 2n = 22

Habitat: Planted; often as windbreaks; on Kaua'i; O'ahu; Moloka'i; Maui; and Hawai'i; and regenerating from seed within the plantations.

Elevation Range:

Historical Distribution

Uses and Culture

USES

Natural History

Statewide Status

Naturalized

Island Status

Kaua'i Unknown
O'ahu Only found in cultivation
Molokai Unknown
Lana'i Naturalized
Kaho'olawe Only found in cultivation
Maui Naturalized
Hawai'i Naturalized

Dispersal Agents

Wind
Forestry

Pollinators

Bibliography

Name Published In: Trans. Linn. Soc. London 3: 287 (1797)

Other References

Wagner et al. 1990:956 (K, O, Mo, M, H); Staples & Herbst 2005:420 (KEY), 422 (DESCR); Faccenda, Arthur, et al. 2025:195 (L); Note: changed to O?, Mo?, no nat. spms. Apr 2025

Occurrences

SNo. Scientific Name Locality Habitat Basis of Record Description Recorded By Record Number Island Source Date
1 Eucalyptus paniculata Prospect Hill Preserved_Specimen Inciong, H. 9 Maui BISH 1960-04-01
2 Eucalyptus paniculata Kapalama Hts., Kamehameha Schools Preserved_Specimen Pearsall, G.A. Oahu BISH 1952-01-01
3 Eucalyptus paniculata Hawaii Preserved_Specimen Munro, G.C. 18 Hawaii BISH 1937-02-01
4 Eucalyptus paniculata Makawao Reserve Preserved_Specimen Inciong, H. 6 Maui BISH 1960-04-29
5 Eucalyptus paniculata South Kohala District, Puu Kapu Ahupuaa across Hwy. 190 from Waimea- Kamuela Airport Trees planted in this area. Preserved_Specimen Herbst, D.R. 9801 Hawaii BISH 1996-11-10
6 Eucalyptus paniculata Tantalus Preserved_Specimen 6048 Oahu BISH 1909-11-01
7 Eucalyptus paniculata Southern Lanai, E of Manele Rd along former edge of plantation land open, sunny, dry area dominated by grass. Hundreds of tree naturalized on hillside, forming some dense stands but this tree growing solitarily Preserved_Specimen Faccenda, K. 3208 Lanai BISH 2023-06-23
8 Eucalyptus paniculata East Maui, Junction of Haleakala Hwy & Hanamu Road Pasture with planted Eucalyptus grove. Preserved_Specimen tree 15m; bark of trunk dard, furrowed Annable, C.R. 3897 Maui BISH 1999-02-05
9 Eucalyptus paniculata Luamakika Enclosure Preserved_Specimen Wagner, W.L. 5773 Kahoolawe BISH 1988-02-24
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