Flora of North America species comparison

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Eucalyptus polyanthemos

Eucalyptus camaldulensis

red box, silver dollar gum

red gum, red or river red gum, river red gum
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 25 m; trunk gray or tan, nearly straight, ± smooth; bark usually shed in irregular strips distally, sometimes persistent toward trunk base; branches often hanging in clusters.
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.

(juvenile alternate, petiolate);

petiole 0.3–2 cm;

blade green, lanceolate, 6–20 × 1.5–2.5 cm.
Inflorescences

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

7-flowered, umbels.
Peduncles

1–4 cm.

0.8–1.2 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 hemispheric, 2–3 mm, length ± equaling calyptra;

calyptra mostly hemispheric, often rostrate, rarely bluntly conic;

stamens white.
Capsules

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

valves 3 or 4, included.

hemispheric, 5–9 mm, not glaucous;

valves 3–5, exserted.
2n

= 22.

Eucalyptus polyanthemos

Eucalyptus camaldulensis
Phenology Flowering winter–spring. Flowering spring–early summer.
Habitat Disturbed coastal urban areas. Disturbed habitats, river bottoms.
Elevation 0–200 m. (0–700 ft.) 0–1200 m. (0–3900 ft.)
Distribution
from FNA
CA; se Australia [Introduced in North America]
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; CA; Australia [Introduced in North America; introduced also in South America]
[WildflowerSearch map]
[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 camaldulensis is the most widely cultivated eucalypt, with E. globulus and E. grandis being close second and third. Several infraspecific taxa have been recognized for this variable species and more than one of these may be naturalized in North America.

(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. citriodora, E. cladocalyx, E. conferruminata, E. coolabah, 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) Dehnhardt: Cat. Horti Camald. ed. 2, 20. (1832) — name conserved
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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