Flora of North America species comparison

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Eucalyptus polyanthemos

Eucalyptus robusta

red box, silver dollar gum

swamp mahogany
Habit Trees, to 25 m; trunk gray or tan, smooth or rough; bark rough, fibrous, and persistent, or smooth and shed in flakes or irregular strips. Trees, to 30 m; trunk reddish brown, rough; bark persistent, deeply furrowed, soft, spongy, fibrous, rough on small branches.
Leaves

petiole 1–2.5 cm;

blade grayish green, silver, or bluish green, round, elliptic, or ovate, 5–10 × 1.5–5 cm, surfaces occasionally glaucous.

petiole 1.5–3 cm, slightly flattened;

blade lighter green abaxially, broadly lanceolate, 8.5–17 × 2.5–7 cm, surfaces glossy.
Inflorescences

5–7-flowered, terminal or axillary, umbels in panicles.

9–15-flowered, umbels.
Peduncles

1–4 cm.

broadly flattened, 1.5–3 cm.
Flowers

hypanthium ovoid to obconic, ca. 4 mm, length ca. 2 times calyptra;

calyptra conic to hemispheric;

stamens white;

anthers rigid on filaments, adnate, absent on outer filaments.

hypanthium obconic to pyriform, 6–7 mm, length ± equaling calyptra;

calyptra conic to rostrate, 10–12 mm;

stamens white.
Capsules

ovoid or subpyriform, 5–6 mm, to 6 mm wide, glaucous;

valves 3 or 4, included.

cylindric, 10–18 mm, not glaucous;

valves 3 or 4, fused after dehiscence, ± level with apex or included and joined across orifice.

Eucalyptus polyanthemos

Eucalyptus robusta
Phenology Flowering winter–spring. Flowering summer–fall.
Habitat Disturbed coastal urban areas. Disturbed areas.
Elevation 0–200 m. (0–700 ft.) 0–200 m. (0–700 ft.)
Distribution
from FNA
CA; se Australia [Introduced in North America]
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; FL; e Australia [Introduced in North America]
[BONAP county map]
Discussion

Eucalyptus polyanthemos is known from the San Joaquin Valley, Central Coast, San Francisco Bay Area, Outer South Coast Ranges, South Coast, Santa Catalina Islands, and Western Transverse Ranges.

Juvenile, adult, and transitional leaves are occasionally found in crowns of mature naturalized trees.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Eucalyptus robusta is known from Los Angeles, Monterey, Orange, San Diego, San Luis Obispo, Santa Barbara, Santa Cruz, and Ventura counties in California, and from Charlotte, Lee, Martin, and St. Lucie counties in Florida.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 10. FNA vol. 10.
Parent taxa Myrtaceae > Eucalyptus Myrtaceae > Eucalyptus
Sibling taxa
E. camaldulensis, E. citriodora, E. cladocalyx, E. conferruminata, E. coolabah, E. globulus, E. grandis, E. mannifera, E. pulchella, E. robusta, E. sideroxylon, E. tereticornis, E. torelliana, E. viminalis
E. camaldulensis, E. citriodora, E. cladocalyx, E. conferruminata, E. coolabah, E. globulus, E. grandis, E. mannifera, E. polyanthemos, E. pulchella, E. sideroxylon, E. tereticornis, E. torelliana, E. viminalis
Name authority Schauer in W. G. Walpers: Repert. Bot. Syst. 2: 924. (1843) Smith: Spec. Bot. New Holland, 39, plate 13. (1795)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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