Flora of North America species comparison

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Eucalyptus polyanthemos

Eucalyptus coolabah

red box, silver dollar gum

coolibah
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 10 m; trunk grayto tan, rough; bark fissured.
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 1.4–2 cm;

blade dull bluish gray-green, narrowly lanceolate, 8–17 × 0.8–2.5 cm, surfaces rarely glaucous.
Inflorescences

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

7-flowered, terminal, umbels in panicles.
Peduncles

1–4 cm.

0.5–2.8 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, ± 2 mm, length ± equaling calyptra;

calyptra obconic, apiculate;

stamens white.
Capsules

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

valves 3 or 4, included.

hemispheric, 3–5 mm, to 6 mm wide;

valves 3 or 4, exserted.

Eucalyptus polyanthemos

Eucalyptus coolabah
Phenology Flowering winter–spring. Flowering spring–summer.
Habitat Disturbed coastal urban areas. Urban ephemeral water­ways.
Elevation 0–200 m. (0–700 ft.) 300–400 m. (1000–1300 ft.)
Distribution
from FNA
CA; se Australia [Introduced in North America]
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; n Australia [Introduced in North America]
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 coolabah is an escape along the occasionally flooded Salt River and its tributaries near Phoenix. It is similar to E. microtheca F. Mueller and commonly sold under that name.

(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. globulus, E. grandis, E. mannifera, E. polyanthemos, E. pulchella, E. robusta, E. sideroxylon, E. tereticornis, E. torelliana, E. viminalis
Name authority Schauer in W. G. Walpers: Repert. Bot. Syst. 2: 924. (1843) Blakely & Jacobs in W. F. Blakely: Key Eucalypts, 245. (1934)
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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