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Genus Rhodanthe Family Asteraceae

Description: Annual or perennial herbs.

Leaves alternate or subopposite, cauline [or basal], simple.

Heads solitary or variously clustered, sessile or pedunculate; heads cylindrical to subglobose; involucral bracts multiseriate, stiff and scarious with flattened claw, the inner often with white or coloured radiating laminas; receptacle flat to conical, glabrous [or hairy], naked [or with thin receptacle bracts]. Florets 1–numerous, bisexual or the outer female, the innermost sometimes male. Corollas tubular or funnel-shaped above, ± actinomorphic. Anthers with weak filiform tails. Style branches truncate to triangular, papillose.

Achenes hairy; pappus of several narrowly to broadly plumose bristles, persistent or caducous, not breaking evenly above base.


Photo © ANBG

Herbarium
Sheet

Distribution and occurrence: World: 46 species, endemic Australia. Australia: all States.

Text by Paul G. Wilson
Taxon concept:

 Key to the species 
1Heads with white or coloured radiating bracts2
Heads without white or coloured radiating bracts12
2Branches cottony or woolly, sometimes sparsely so; leaves lacking sessile globose glands3
Branches glabrous, or hairy only below involucre; leaves with sessile globose glands
                       Back to 1
9
3Achenes minutely hirsute; leaves filiform, 4–8 mm long; involucre turbinate, woollyRhodanthe polyphylla
Achenes silky-pilose; leaves various, to 4 mm long; involucre various
                       Back to 2
4
4Heads narrow-cylindrical to ellipsoid, sessile; radiating tip to bracts less than 1 mm longRhodanthe pygmaea
Heads cup-shaped to hemispherical or turbinate; radiating tip to bracts more than 1 mm long
                       Back to 3
5
5Heads hemispherical, c. 10 mm long, involucral bracts glabrous; heads mostly solitary on leafy branches6
Heads cup-shaped or turbinate; involucral bracts sparsely woolly or woolly-ciliate; heads clustered
                       Back to 4
7
6Outer involucral bracts pale brown; pappus bristles freeRhodanthe stuartiana
Outer involucral bracts white; pappus bristles united into a tube towards base
                       Back to 5
Rhodanthe floribunda
7Plant only sparsely woolly; pappus bristles united into a tube towards base, falling as a wholeRhodanthe troedelii
Plant obviously woolly; pappus bristles free, persistent
                       Back to 5
8
8Radiating laminas of involucre 4–7 mm longRhodanthe corymbiflora
Radiating laminas of involucre c. 2 mm long
                       Back to 7
Rhodanthe microglossa
9Leaves not ciliate; annuals10
Leaves scabrous-ciliate; perennials
                       Back to 2
Rhodanthe anthemoides
10Leaves sparsely hispid with short crinkly white hairs; rays white (yellow in Griffith area)Rhodanthe diffusa
Leaves glabrous apart from sessile spherical glands; rays white or yellow
                       Back to 9
11
11Heads narrowly cup-shaped; rays whiteRhodanthe stricta
Heads hemispherical; rays yellow
                       Back to 10
Rhodanthe polygalifolia
12Heads c. 7 mm long, leaves linear-triquetrousRhodanthe pygmaea
Heads 3–5 mm long, leaves linear to obovate
                       Back to 1
13
13Leaves glabrous or sparsely villousRhodanthe laevis
Leaves cottony or woolly
                       Back to 12
14
14Heads densely woolly with 1 floretRhodanthe uniflora
Heads glabrous or bracts woolly-ciliate; 2 or more florets
                       Back to 13
15
15Heads with 2 or 3 florets, enveloped in woolRhodanthe moschata
Heads with c. 10 florets not covered in wool
                       Back to 14
Rhodanthe tietkensii

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