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Genus Boronia Family Rutaceae

Description: Shrubs or rarely small trees or rarely herbs, glabrous or with simple or stellate hairs, unarmed.

Leaves opposite [or rarely subopposite or whorled], simple or 1-foliolate, palmately 3-foliolate or pinnately 3–19[-41]-foliolate or bipinnate; leaflets with margins entire or toothed, or rarely 3-lobed; lateral leaflets opposite.

Inflorescences axillary or terminal, cymose or paniculate or reduced to single flowers. Flowers bisexual, 4- or rarely 5-merous. Sepals usually 4, free. Petals usually 4, valvate or imbricate, free, persistent or not persistent in fruit. Stamens mostly 8, free, erect or pyramidally arranged. Carpels 4 [or rarely 5], ± free, lacking a sterile apex; styles fused, arising terminally or subterminally from the carpels; stigma scarcely differentiated from style or capitate or grossly swollen and almost sessile; ovules 2 in each carpel.

Fruit of 1–4 cocci; cocci not transversely ridged, with rounded apices; seeds released forcibly from dehiscing cocci, dull or shiny, black.


Herbarium
Sheet

Herbarium
Sheet

Distribution and occurrence: World: c. 140 spp, endemic Aust., all States.

Text by P.H. Weston & M.F. Duretto
Taxon concept:

Taxa not yet included in identification key
Boronia hapalophylla,    Boronia inflexa

 Key to the species 
1Hairs stellate; petals valvate, midvein of petal prominently raised on the outer surface.3
Hairs simple or absent; petals imbricate (except in B. algida), midvein of petal not prominently raised (except in B. barkeriana).2
2Leaves 1-foliolate.18
Leaves pinnate with 3 or more leaflets.
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26
3At least some leaves pinnate with 3–11 leaflets.4
All leaves simple or 1-foliolate.
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13
4Leaflets strongly discolorous, indumentum of the lower surface dense and concealing the epidermis.5
Leaflets slightly discolorous or concolourous, indumentum of the lower surface not dense and not concealing the epidermis.
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7
5Sepals narrow-deltate, at least 2.5 times as long as broad, the apex acute; leaves mostly 3–11-foliolate, rarely some leaves 1-foliolate.6
Sepals ovate, 1.5–2 times as long as broad, the apex acute or acuminate; leaves 1-foliolate or 3–7-foliolate.
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Boronia ledifolia
6Largest terminal leaflet >20 mm long; largest lateral leaflets >18 mm long; all leaflets 10–15 mm wide; petals 7–8 mm long; coastal ranges north from Coffs Harbour (NC).Boronia umbellata
Largest terminal leaflet <25 mm long, largest lateral leaflets <18 mm long; all leaflets 2–7 mm wide; petals 3–12 mm long; chiefly from Bylong to Denman, W part of the Nandewar Ra. and Gibraltar Ra. N.P. (NT, NWS, CWS)
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Boronia angustisepala
7Midrib not raised on the lower surface of the leaflets.8
Midrib raised on the lower surface of the leaflets.
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12
8Sepals narrowly ovate to deltate, at least twice as long as broad.9
Sepals ovate to deltate, less than twice as long as broad.
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10
9Leaves with sparse to moderately dense indumentum; stellate hairs sometimes stalked, grey to white, rays of stellate hairs to 0.5 mm long, flexuous and dull; chiefly on the Western Slopes and adjacent ranges, north from Inverell district (NT, NWS).Boronia granitica
Leaves glabrescent or with a sparse indumentum; stellate hairs not stalked, yellowish; rays of stellate hairs <0.25 mm long, ± straight, shiny; confined to Bolivia Hill (NT).
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Boronia boliviensis
10Broadest leaflets >3 mm wide; peduncle 2–10 mm long; leaves sometimes 3-foliolate or 1-foliolate; mature cocci glabrous or hirsute; at Woodsreef (NWS) and from Lees Pinch to Berrima (CC, CT, CWS).11
Broadest leaflets <3 mm wide; peduncle <3 mm long; leaves rarely 1- or 3-foliolate and then at first few nodes of branch only; in the Coonabarabran to Warrumbungle Ra. district (NWS).
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Boronia warrumbunglensis
11Leaves dorsiventral with lower surface paler than upper surface; from Lees Pinch to Berrima (CC, CT, CWS).Boronia rubiginosa
Leaves isobilateral with lower surface similar colour to upper surface; confined to Woodsreef (NWS).
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Boronia ruppii
12Leaves with a moderately dense indumentum; rays of stellate hairs 0.1–1 mm long;Boronia mollis
Leaves glabrous or glabrescent; rays of stellate hairs to 0.25 mm long;
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Boronia fraseri
13Leaves sessile.14
Leaves petiolate or base so attenuate so as to appear petiolate.
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16
14Margins of leaves glandular-warty; sepals narrowly ovate to deltate, at least twice as long as broad; rays of stellate hairs usually dull and flexuous.Boronia repanda
Margins of leaves smooth; sepals ovate to deltate, less than twice as long as broad; rays of stellate hairs shiny and usually ± straight.
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15
15Leaves slightly discolorous, usually glabrescent or rarely with a dense minute indumentum on both surfaces (hirsute Pilliga form); fruit hirsute; Western Slopes (NWS, CWS, NWP).Boronia glabra
Leaves strongly discolorous, upper surface of leaves glabrous and shiny, lower surface with a dense stellate indumentum: fruit glabrous; coastal areas north from Woolgoolga district (NC).
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Boronia rosmarinifolia
16Leaves glabrous or glabrescent, only slightly discolorous.Boronia ruppii
Leaves with a dense indumentum (epidermis not visible) on the lower surface (except in some juvenile leaves), adult leaves strongly discolorous.
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17
17Leaves with upper surface glandular-warty, margins glandular-toothed; leaves papery when dry, not firm.Boronia chartacea
Leaves with upper surface and margins smooth; leaves firm.
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Boronia ledifolia
18Leaves broad-obovate to circular.19
Leaves narrower, ± linear or terete to elliptic or obovate.
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20
19Margins of leaves finely toothed; swollen apex of staminal filaments hairy; style vestigial, obscured by the massively swollen globose stigma.Boronia serrulata
Margins of leaves entire; swollen tips of staminal filaments glabrous; style terete; stigma about as wide as style.
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Boronia rhomboidea
20Leaves terete to semi-terete.21
Leaves ± flat.
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23
21Staminal filaments glabrous; inflorescences terminal (though often on short axillary shoots).Boronia deanei
Staminal filaments ciliate; inflorescences axillary or axillary and terminal.
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22
22Leaves 2–8 mm long, obtuse; petals tipped with a small but distinct incurved hook, white to bluish mauve, persistent in fruit.Boronia coerulescens
Leaves 8–25 mm long, acuminate; petals lacking an incurved hook, bright pink, not persistent in fruit.
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Boronia falcifolia
23Inflorescences axillary; petals tipped with a small but distinct incurved hook, persistent in fruit; bracts persistent; seeds dull, finely wrinkled.24
Inflorescences terminal; petals lacking an incurved hook, not persistent in fruit; bracts not persistent in fruit (often falling before flowering); seeds shiny, smooth.
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25
24Leaves discolorous, darker on upper surface; branchlets glabrous.Boronia polygalifolia
Leaves concolorous; branchlets with 2 longitudinal pilose lines separated by glabrous decurrent leaf bases.
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Boronia nana
25Petals 6–11 mm long; sepals caducous in fruit; bracteoles reduced to minute calli, persistent in fruit.Boronia barkeriana
Petals 3–6 mm long; sepals persistent in fruit; bracteoles scale-like, not persistent in fruit.
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Boronia parviflora
26Petals valvate; leaflets spathulate to broad-spathulate, distinctly darker on upper surface; plant ± branching dichotomously around the exclusively terminal inflorescences.Boronia algida
Petals imbricate; leaflets either not spathulate or if so, then concolorous; plant not branching dichotomously; inflorescences axillary or terminal.
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27
27Petals tipped by a small but distinct incurved hook, usually persistent in fruit; anther appendage white, contrasting with the brown anther connective; seeds dull, finely wrinkled.28
Petals lacking a terminal incurved hook, not persistent in fruit; anthers uniformly cream in colour; anther appendage minute or absent; seeds shiny, smooth.
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31
28Branchlets prominently 4-angled or with 2 deep longitudinal grooves separated by decurrent leaf bases, glabrous; leaves bipinnate.Boronia anethifolia
Branchlets with 2 very shallow pilose longitudinal grooves separated by glabrous to pilose decurrent leaf bases; leaves 3-foliolate to pinnate to bipinnate.
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29
29Leaflets mostly 3-lobed at apex.Boronia anemonifolia
Leaflets entire.
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30
30Leaves mostly pinnate to bipinnate; leaflets narrow- to linear-oblong, usually obtuse.Boronia occidentalis
Leaves mostly 3-foliolate; leaflets narrow-elliptic, acute.
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Boronia rigens
31Leaves 3-foliolate; leaflets terete.Boronia falcifolia
Leaves pinnate, usually with 5 or more leaflets; leaflets flat to terete.
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32
32Swollen tip of staminal filaments densely hairy; style vestigial, concealed by the massively swollen, globose stigma.Boronia floribunda
Swollen tip of staminal filaments glabrous; style terete; stigma about as wide as style.
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33
33Branchlets glandular-warty, usually hairy.34
Branchlets not warty, glabrous or sometimes hairy.
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36
34Leaflets spathulate to broad-spathulate to cuneate; longest leaflets 4–7 mm long.Boronia microphylla
Leaflets mostly narrow-elliptic to oblong; longest leaflets 7–25 mm long.
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35
35Branchlets glabrous or sparsely hairy between decurrent leaf bases; leaves 45–70 mm long; peduncles 4–15 mm long, pedicels 5–17 mm long.Boronia muelleri
Branches pubescent; leaves 16–26 mm long; peduncles 2–5 mm long, pedicels 5–7 mm long.
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Boronia imlayensis
36Branchlets hairy, sometimes the hairs short and restricted to 2 longitudinal lines separated by glabrous decurrent leaf bases.37
Branchlets glabrous.
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38
37Leaflets 0.3–1 mm wide, linear-oblong; sepals and pedicels ± pilose.Boronia subulifolia
Leaflets 1–3 mm wide, mostly narrow-oblong to elliptic; sepals and pedicels glabrous.
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Boronia safrolifera
38Margins of leaflets finely glandular-crenulate; leaflets slightly discolorous, darker on upper surface.Boronia thujona
Margins of leaflets entire; leaflets concolorous.
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Boronia pinnata

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