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Genus Ozothamnus Family Asteraceae

Description: Shrubs.

Leaves alternate, sometimes minute and stem-clasping; margins often revolute, usually entire; mostly sessile.

Heads in clusters or umbellate corymbs, terminal, or terminal on short lateral branches; heads oblong, campanulate or globose; involucral bracts papery, tomentose, glabrescent or glabrous, with or without radiating laminas; receptacle flat, without interfloral scales. Florets as long as involucral bracts, all bisexual or with a few female filiform outer florets; corolla yellow or white; style branches truncate, papillose.

Achenes subterete or 4-angled, oblong, sparsely hairy with short clavate hairs or papillose; pappus of fine barbellate hairs, the apical barbels often clavate and opaque white.


Photo © ANBG

Distribution and occurrence: World: 53 species, Australia, New Zealand, New Caledonia. Australia: 44 species (endemic), Qld, N.S.W., Vic., Tas., S.A. [Helichrysum subgen. Ozothamnus]

Text by J. Everett
Taxon concept:

Taxa not yet included in identification key
Ozothamnus sp. Boonoo Boonoo (P.J.Clarke NE068242A)

 Key to the species 
1Leaves scale-like, appressed to the stem or stem-clasping, usually less than 5 mm long2
Leaves erect or reflexed, petiolate or sessile or stem-clasping but not appressed or reduced, usually more than 5 mm long5
2Inflorescence terminal, tips of involucral bracts transparent or opaque but then not spreading3
Inflorescence on most lateral shoots, tips of the involucral bracts opaque white, spreading
                       Back to 1
Ozothamnus cupressoides
3Involucral bracts totally transparent or hyaline4
Involucral bracts almost entirely opaque white, inflated
                       Back to 2
Ozothamnus tuckeri
4Leaves fused to the stem for half their lengthOzothamnus adnatus
Leaves articulate or stem-clasping
                       Back to 3
Ozothamnus diotophyllus
5Involucral bracts woolly or thin and scarious or hyaline, without opaque white laminas6
Involucral bracts with opaque white papery laminas
                       Back to 1
13
6Involucral bracts white-woolly7
Involucral bracts scarious or hyaline
                       Back to 5
8
7Leaves obovate, the upper surface scabrousOzothamnus obovatus
Leaves lanceolate, the upper surface glabrous
                       Back to 6
Ozothamnus whitei
8Leaves linear, c. 1 mm wide9
Leaves lanceolate or obcordate, more than 3 mm wide
                       Back to 6
10
9Heads globose; leaves stiff, fused to the stem for half their lengthOzothamnus tesselatus
Heads narrow-campanulate; leaves flexible, not fused to the stem
                       Back to 8
Ozothamnus cassinioides
10Stems strongly angularOzothamnus vagans
Stems terete or slightly striate
                       Back to 8
11
11Leaves with petiole at least 4 mm long, loosely webby on both surfaces; decumbent, prostrate shrubsOzothamnus bidwillii
Leaves with petiole ± 1 mm long, upper surface glabrous, lower surface closely tomentose; erect shrubs
                       Back to 10
12
12Leaves oblong; inflorescence pyramidalOzothamnus rufescens
Leaves obcordate; inflorescence a broad corymb
                       Back to 11
Ozothamnus obcordatus
13Involucral bracts almost entirely opaque white, inflated and crinkly, hyaline only at the very base; leaves tightly revolute, completely obscuring the lower surfaceOzothamnus diosmifolius
Outer involucral bracts scarious, hyaline, brown, yellow or red; inner involucral bracts with white papery laminas; leaves flat, recurved or slightly revolute, but not obscuring the lower surface
                       Back to 5
14
14All new growth with long needle-like glistening hairs; outer involucral bracts redOzothamnus alpinus
Plants without needle-like hairs; outer involucral bracts brown or yellow
                       Back to 13
15
15Leaves spathulate to cuneateOzothamnus cuneifolius
Leaves linear, lanceolate or oblong
                       Back to 14
16
16Leaves lanceolate, the largest more than 6 mm wide17
Leaves linear or oblong, less than 3 mm wide
                       Back to 15
18
17Heads 5–10 mm long, 8–12 mm diamOzothamnus stirlingii
Heads 4–5 mm long, 2.5 – 4 mm diam
                       Back to 16
Ozothamnus argophyllus
18Inflorescence of corymbs terminal on many short lateral shoots, often only on the upper side of arching branches19
Inflorescence of corymbs terminal at the ends of major branches; shrubs without arching branches
                       Back to 16
20
19Leaves with midrib on the lower surface glabrous; upper surface of the leaf glabrescentOzothamnus thyrsoideus
Leaves with midrib on the lower surface tomentose, the same colour as the rest of the surface; upper surface of the leaf with appressed hairs arranged pinnately
                       Back to 18
Ozothamnus secundiflorus
20Most leaves at right angles to the stem; leaves with base distinctly tinged yellow on lower surface; outer bracts usually tinged yellowOzothamnus turbinatus
Leaves variously spreading but not consistently arranged; neither base of leaves nor bracts tinged yellow
                       Back to 18
21
21Leaves with margins revolute, scabrous with minute antrorse prickles on the upper surfaceOzothamnus rosmarinifolius
Leaves with margins flat or scarcely recurved; leaves woolly or glabrescent on the upper surface
                       Back to 20
22
22Leaves with margins finely crenateOzothamnus ferrugineus
Leaves with margins smooth
                       Back to 21
Ozothamnus conditus

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