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Genus Cassinia Family Asteraceae

Description: Aromatic woody shrubs with glandular and non-glandular hairs.

Leaves cauline, alternate, sessile, entire, ± flat or the margins recurved or revolute.

Heads small, numerous in dense, terminal panicles or corymbs; heads cylindrical to campanulate; involucral bracts imbricate or longitudinally ranked, 3–5-seriate, the outer bracts membranous, usually pink-brown, the inner bracts leathery and usually glandular at the base, with a broad scarious limb, the tips opaque and white, yellow or brown, or entirely translucent and straw-coloured, greenish or red-brown; receptacle with scarious scales similar to the bracts. Florets bisexual, tubular, 5-merous. Anthers tailed at the base with short terminal appendages. Style branches linear, with truncate apices.

Achenes brown, ovoid; pappus a single ring of bristles fused at the base.


Photo © ANBG

Herbarium
Sheet

Distribution and occurrence: World: c. 21 species, Australia, New Zealand. Australia: 18 species (endemic), all States except N.T.

This genus is under revision. The boundary between Cassinia and Ozothamnus is sometimes obscure and the traditional placement of some of the species is being assessed. The record of C. species A in Jacobs & Pickard (1981) has not been substantiated; it is represented by a an inadequate specimen from near Rylstone.

Text by J. Everett
Taxon concept:

Taxa not yet included in identification key
Cassinia copensis,    Cassinia furtiva,    Cassinia hewsoniae,    Cassinia lepschii,    Cassinia macrocephala,    Cassinia maritima,    Cassinia monticola,    Cassinia ochracea,    Cassinia sp. D sensu Everett (1992),    Cassinia straminea,    Cassinia telfordii,    Cassinia tenuifolia,    Cassinia theresae,    Cassinia thinicola,    Cassinia venusta

 Key to the species 
1Inflorescence a corymb2
Inflorescence a pyramidal panicle13
2Leaves linear, about 1 mm wide3
Leaves lanceolate or ovate or oblong, mostly more than 2 mm wide
                       Back to 1
9
3Involucral bract tips translucent4
Involucral bract tips opaque
                       Back to 2
6
4Involucral bracts in parallel rows, longitudinally ranked; stems pale with white, woolly hairsCassinia cunninghamii
Involucral bracts imbricate in alternating rows, not longitudinally ranked; stems reddish or yellow with stiff glandular hairs
                       Back to 3
5
5Heads ovoid to globose, 5 mm long 3–5 mm wide with 8 or 9 florets; leaves with a prominently raised and pale midrib visible on the under surface especially at the baseCassinia species B
Heads narrow-ovoid, 4 mm long, 2 mm wide, with 5 or 6 florets; leaves with a visible midrib below but neither prominently raised nor conspicuously pale
                       Back to 4
Cassinia compacta
6Involucral bract tips bright yellow or yellow-green; heads densely packed and curved inwards; leaves 5–8 cm long, robust, strongly scabrousCassinia leptocephala
Involucral bract tips white or cream; leaves 3 cm long or less
                       Back to 3
7
7Involucral bracts in parallel series, longitudinally ranked8
Involucral bracts in alternating series, not longitudinally ranked
                       Back to 6
Cassinia aculeata
8Involucral bracts obtuse, the tip not thickened; florets 5 or 6 per headCassinia uncata
Involucral bracts keeled, the tip thickened and concave on the inner surface, or emarginate when split; florets 9–12 per head
                       Back to 7
Cassinia adunca
9Involucral bract tips translucentCassinia species C
Involucral bract tips opaque
                       Back to 2
10
10Involucral bract tips bright yellowCassinia aureonitens
Involucral bract tips white or cream
                       Back to 9
11
11Leaves broad-ovate, base stem-clasping or cordate, margins toothed especially at apexCassinia denticulata
Leaves lanceolate, base tapered, margins without teeth
                       Back to 10
12
12Leaves with 3 more or less parallel veins on the lower surface, especially prominent at baseCassinia trinerva
Leaves with only 1 vein prominent on the lower surface
                       Back to 11
Cassinia longifolia
13Leaves linear, c. 1 mm wide14
Leaves lanceolate, ovate or oblong, mostly more than 2 mm wide
                       Back to 1
Cassinia subtropica
14Involucral bract tips opaque15
Involucral bract tips translucent
                       Back to 13
16
15Stems olive or yellowish and usually with spreading glandular hairs, or resinous; heads with 5 or 6 floretsCassinia quinquefaria
Stems white or pale, with soft woolly hairs; heads with 2–4 florets
                       Back to 14
Cassinia laevis
16Leaves more than 15 mm long; involucral bracts straw-coloured or greenish, not widely spreadingCassinia species D
Leaves usually less than 10 mm long; involucral bracts deep red or brown, widely spreading
                       Back to 14
17
17Leaves and stems conspicuously grey or white with woolly hairsCassinia theodori
Leaves glabrous and sticky above, stems inconspicuously woolly
                       Back to 16
Cassinia arcuata

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