7. Species ac
20: 192 (1998)
dawsonii, in honour of John Wyndham
Dawson (1928–), of Wellington, New Zealand, who is an
authority on the Myrtaceae of New Caledonia
Callistemon suberosum Pancher ex Brongn.
to 4 m tall.
60–85 mm long, 15–30 mm wide, subsessile;
blade hairy, the hairs as on the branchlets, elliptic to
obovate, the base attenuate, the apex rounded to retuse,
the veins longitudinal, 5–15.
3–4 mm long.
fimbriate, 2.3–2.8 mm long.
15–20 per flower, occasionally a few stamens
may be fused at the base; filaments green, 25–35 mm long.
3–34 mm long.
4 mm long.
part of Grande Terre.
maquis on more or less eroded or hard soils on ultramafic
Recorded as flowering throughout the
year but mainly from May to July.
The leaf oil of this species contained
approximately equal amounts of mono and sesquiter
penes. The principal monoterpenes encountered were
apinene (12.8%), aphellandrene (10.3%) and terpinolene
(8.2%). There were lesser amounts of pcymene (6.0%),
aterpineol (6.7%), Ebocimene (1.6%), limonene (1.8%)
and linalool (1.2%). The principal sesquiterpenes in the oil
were spathulenol (10.0%), globulol (8.0%), bcaryophyl
lene (4.9%), cubeban11ol (3.1%) and viridiflorol (2.1%).
The oil yield (fresh weight, w/w) was 0.1%.
Hnawia et al. 2012
This is a very handsome species but its utilisation
in horticulture is limited as it, as with the other endemic
New Caledonian species, is difficult to grow on non
barium 1: 41, figs 5, 14E, 15E, 15N (1968)
with a white powder, an apparent reference to the colour
of the leaves that commonly give the crown of the plant a
silvery, whitish appearance
4–30 m tall; bark papery, white,
cream or greyish.
glabrescent, pubescent with
a lanuginulose understorey.
alternate, 50–126 mm
long, 10–30 mm wide, 2.3–8.5 times as long as wide,
longpetiolate; blade glabrescent, lanuginulose with a
pubescent overstorey, narrowly elliptic, elliptic, very nar
rowly elliptic or narrowly obovate, in transverse section
transversely linear, the base attenuate, the apex acute,
acuminate or narrowly acute, the veins longitudinal, 5–9,
dense or moderately dense, distinct to obscure,
spicate, interstitial or pseudoter
minal, commonly lateral, with 7–28 triads, up to 25 mm
hairy, glabrescent or glabrous, 2–3 mm
abaxially hairy, 0.6–1.5 mm long, her
baceous to the margin or scarious in a broad marginal
band up to 0.3 mm wide.
caducous or deciduous,
2.2–3.3 mm long.
5–8 per bundle; filaments
white, cream, pale yellow or greenish, 5–7.5 mm long, the
bundle claw 0.5–1.9 mm long, 0.2–0.4 times as long as the
7.8–11.9 mm long.
c. 40–60 per
2.5–3.6 mm long, the calyx lobes deciduous
or weathering away; cotyledons planoconvex.
Western Australia, Northern
Territory, Queensland; also Indonesia and Papua New
Guinea: occurs disjunctly in the Broome–Derby and Wea
ber Range districts in Western Australia, the northern part
of the Northern Territory, and from Cape York Peninsula
south to the Bundaberg district in Queensland. The species
also occurs in southern Papua province, Indonesia, and
southern Papua New Guinea.
woodland, open forest, in seasonally wet or perennial
swamps, on sandy loam, clay, and humic soils.
Recorded as flowering from May to
The leaf oil of this species was domi
nated by sesquiterpenes. The major compounds were
bcaryophyllene (13–34%), caryophyllene oxide (6–19%),
globulol (3–6%) and spathulenol (11–20%). There were
many other sesquiterpenes present in small (<1%)
amounts. Monoterpenes usually contributed virtually
nothing to the oil, though in samples from Mt Molloy (JD
2070) apinene contributed 10–36%.
The yield from the Mt Molloy samples was, likewise, poor
References on essential oils:
Brophy et al. 1988;
Brophy and Doran 1996
This species is perhaps less attractive than other
tree species of the genus but it is well worth including in
mixed plantings with greenishleaved species in parks,
roadside plantings etc. so that the distinctive silvery
greyish foliage of M. dealbata contrasts with the foliage of
the other species.
South Wales, ser. 2, 1: 1106 (1887)
deanei, in honour of Henry Deane
(1847–1924), a railways engineer who also made many
contributions to Australian botany, especially in the fields
of eucalyptology and palaeobotany and who collected the
type material of this species
0.3–2.4 m tall; bark fibrous, grey.
rapidly glabrescent (the pubescent hairs, usually
with some shorter lanuginosepubescent and lanuginulose
hairs also, ephemeral).
alternate, 10–31 mm long,
3–9 mm wide, 3–6 times as long as wide, short to long
petiolate; blade glabrescent, sericeous (sometimes grading
to sericeouspubescent), narrowly obovate to obovate or
narrowly elliptic to elliptic, in transverse section trans
versely linear, the base cuneate or attenuate, the apex
acuminate, the veins pinnate to longitudinalpinnate, 5–9
when pinnate and 5–7 when longitudinal,
with 3–25 monads, up to 40 mm wide.
hairy or glabrescent, 1.3–2.2 mm long, usually herbaceous
to the margin (sometimes an illdefined band of thinner
tissue to c. 0.4 mm wide is present around the margin).
deciduous, 4–6.5 mm long.
bundle; filaments white, 8.5–18.5 mm long, the bundle
claw 1.5–2.5 mm long, 0.1–0.2 times as long as the fila
11–19 mm long.
c. 110–160 per locule.
7–9 mm long, the calyx lobes soon weathering away;
New South Wales: from the
Berowra district south to the Nowra district.
heathland, remnant swamp and woodland, on sandy loam,
sandstone, and laterite.
Recorded as flowering from July to
The leaf oil of this species was domi
nated by monoterpenes. The major components were
apinene (46–52%) and 1,8cineole (31–38%) These were
accompanied by lesser amounts of limonene (2–3%) and
aterpineol (6–11%); no other component being greater
than 0.5%. Sesquiterpenes were virtually absent from this
oil, with the only significant members being E,Efarnesol,
caryophyllene oxide and spathulenol (each 0.1%). The
btriketone leptospermone was also detected, though in
trace amounts. A second sample (p147, Erich Lassak) pro
duced a similar monoterpenic oil but contained slightly
more leptospermone, as well as flavesone.
This species is little known but has quite attrac
tive flowers and should be trialled in dryish climates as an
54: 62 (1916)
fitting, beautiful, the reason for the choice of epithet not
given but possibly in reference to the appearance of the
Metrosideros decora Salisb.
8–10 m tall; bark papery, brown
lose to lanuginulosepuberulous.
7.8–16.5 mm long, 1–2 mm wide, 4.5–10.5 times as long
as wide, subsessile to shortpetiolate; blade glabrescent,
lanuginulose to lanuginulosepuberulous, very narrowly
elliptic or narrowly elliptic, in transverse section sublu
nate or transversely linear, the base narrowly cuneate to
attenuate, the apex narrowly acute to acute, the veins long
dense, distinct to obscure, scattered.
spicate, pseudoterminal or interstitial, with
3–30 monads or triads (at least the median floral units
being triads), up to 17 mm wide.
glabrous, 0.7–1.1 mm long, herbaceous to the margin.
deciduous, 2.2–2.5 mm long.
bundle; filaments cream or white, 5–8.6 mm long, the
bundle claw 2.5–4.8 mm long, 0.4–0.6 times as long as the
6–7 mm long.
50–65 per locule.
2–3 mm long, the calyx lobes weathering away;
Queensland, New South Wales:
from the Burnett River district in Queensland south to
the Shoalhaven River district in New South Wales, with a
major gap occurring in northern New South Wales.
est, mixed eucalypt forest, swamps, and on sand.
ber to January.
both mono and sesquiterpenes in similar amounts. There
appeared to be two chemical forms present, depending on
the amount of terpinen4ol present. The first chemical
form contained apinene (18–30%), bpinene (7–12%),
terpinen4ol (1–2%), aterpineol (2–3%), aromadendrene
(5–9%), bicyclogermacrene (2–4%), globulol (4–8%), vir
idiflorol (2–5%) and spathulenol (1–3%). The second form
contained apinene (21.8%), bpinene (4.1%), terpinen
4ol (15.8%), aromadendrene (10.3%), viridiflorene (6.9%),
globulol (5.6%), viridiflorol (2.3%) and spathulenol (2.3%).
The oil yield in both cases (fresh weight, w/w)
This species is a useful ornamental shrub or small
tree for subtropical or temperate regions and will tolerate
damp soils. The amount of terpinen4ol present in one
sample would indicate that a larger survey of the species
may produce even better percentages of this compound,
though the oil yield would have to be much improved.
Roman numeral X (ten), hence decussatus, an allusion to
the crossshaped arrangement of the leaves when viewed
down the axis of the branchlet
1–3 m tall.
puberulous to lanuginulosepuberulous.
long as wide, subsessile; blade glabrescent, puberulous
to lanuginulosepuberulous, very narrowly obovate, very
narrowly elliptic, narrowly obovate or narrowly elliptic,
in transverse section lunate, shallowly lunate, strongly
lunate, subreniform or supervolutecurved, the base
cuneate, the apex acute or obtuse, the veins longitudinal, 3,
sparse to moderately dense, distinct to obscure,
scattered to more or less in rows.
interstitial or pseudoterminal, with 6–22 monads,
up to 16 mm wide.
glabrous or hairy,
1–1.7 mm long.
abaxially glabrous or rapidly
glabrescent, 0.5–0.8 mm long, scarious in a marginal band
0.2–0.5 mm wide.
deciduous, 1.8–2.3 mm long.
12–26 per bundle; filaments mauve or purple,
4.5–6 mm long, the bundle claw 0.5–2 mm long.
c. 45–50 per locule.
embedded in the rachis, the calyx lobes weathering away;
the Eyre Peninsula region of South Australia eastwards to
Recorded as occurring in heathland, coastal
mallee, open eucalypt forest, open scrub, on alluvial sand/
gravel, on limestone/laterite soils, clay loam, and quartzite.
Recorded as flowering from August
The leaf oil from this species was
monoterpenoid in nature. The principal components
were 1,8cineole (53–63%), limonene (7–16%), apinene
(1–8%), terpinen4ol (1–2%) and aterpineol (3–5%).
Sesquiterpenes did not contribute much to the oil, with
the principal components being aromadendrene (1–4%),
bcaryophyllene (1–4%), viridiflorene (1–10%) and glob
Melaleuca decussata is widely grown in temper
ate regions of Australia as it is hardy and adaptable to a
range of soil types. The flowers unfortunately quickly fade
(Wrigley and Fagg 1993) and this lessens the value of the
species as an ornamental.
Botany 12: 872 (1999)
computer software package for biological systematists
and other scientists, especially those necessarily dealing
with large datasets due to the complexities of the taxa
concerned. The word DELTA is derived from DEscription
Language for TAxonomy
pubescent or pubescent, occasionally puberulous or
alternate, 5–12.5 mm long,
1.5–2.8 mm wide, 3.5–8 times as long as wide, sessile or
subsessile; blade glabrescent, with cilia only or minutely
sericeous to sericeouslanuginulose, narrowly elliptic, very
narrowly elliptic or narrowly ovate, in transverse section
sublunate or transversely linear, the base cuneate or trun
cate, the apex acuminate or narrowly acute, the veins
moderately dense, distinct to
obscure, more or less in rows.
with 1–7 monads, up to 15 mm wide.
weakly costate, 0.5–1 mm long, scarious in a marginal band
0.2–0.3 mm wide.
deciduous, 2–3 mm long.
15–40 per bundle; filaments white, 5–6 mm long,
the bundle claw 3.5–4 mm long, 0.5–0.7 times as long as
2–4(–7) mm long.
3–4 mm long, with sepaline teeth (these may
weather away); cotyledons planoconvex.
Western Australia: disjunct in
the Kalbarri, Jurien and Wongan Hills districts.
thicket, open heath, on saline silty soil, brown lateritic clay,
laterite, and on gravelly loam on shallow sandstone.
Recorded as flowering in November
oil. The principal component was 1,8cineole (72.3%).
This was accompanied by lesser amounts of apinene
(11.0%), limonene (3.5%), myrcene (2.2%), bpinene
(1.3%), terpinen4ol (1.1%) and aterpineol (0.6%).
Sesquiterpenes contributed less than 5% of the oil, with
the principal members being spathulenol (1.2%), globulol
(0.8%), bicyclogermacrene (0.9%) and viridiflorol (0.6%).
The oil yield (fresh weight, w/w) was 0.8%.
dempta, from the Latin demptus, to take
away, remove, in reference to the reduction of the sepaline
teeth in this species
1.5–2.2 m tall.
decussate, 4.2–8 mm long, 2.5–6.2 mm wide,
1.1–1.9 times as long as wide, shortpetiolate or subsessile;
blade soon glabrescent (the lanuginosepubescent hairs
ephemeral), ovate, broadly ovate or elliptic, in transverse
section lunate, the base rounded, cuneate or subcordate,
the apex acute, broadly acute or obtuse, the veins lon