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Genus Dillwynia Family Fabaceae
Subfamily Faboideae

Description: Shrubs.

Leaves alternate, simple, linear, terete, or ± trigonous, with a groove along the upper surface, [rarely almost flat with inrolled margins]; stipules occasionally conspicuous but usually minute or absent.

Inflorescences racemose, umbellate or capitate, axillary or terminal; bracts small, caducous or persistent; bracteoles small, on pedicel often distant from the calyx, caducous or persistent. Calyx teeth short or as long as the tube, the 2 upper teeth ± united into a lip, apices parallel or divergent. Petals yellow or yellow and red to deep orange-red, clawed; standard broader than long; the wings narrow, auriculate at base of lower margin; keel shorter than or equal to wings, straight or scarcely incurved. Stamens free, often attached to a ring at base of calyx tube. Ovary shortly stipitate, pubescent; style erect, thick, hooked below the apex with a truncate or thick stigma; ovules 2 on short funicles.

Pods nearly sessile, ovoid or globose, turgid; seeds smooth or ornamented, with an aril.


Photo © ANBG

Herbarium
Sheet

Distribution and occurrence: World: c. 40 spp., endemic Aust., all States except N.T.

This genus is under revision.

Text by P.H. Weston & P.C. Jobson
Taxon concept:

Taxa not yet included in identification key
Dillwynia crispii,    Dillwynia phylicoides A.Cunn species complex,    Dillwynia retorta (J.C.Wendl.) Druce species complex,    Dillwynia rodwayi,    Dillwynia sp. trichopoda (Maiden & Boorman s.n. NSW40290)

 Key to the species 
1Leaves distinctly spirally twisted.2
Leaves not twisted or rarely slightly so.8
2Inflorescences terminal and/or in the upper axils, racemose with 1 to several flowers, often pedunculate.3
Inflorescences axillary, consistently 2-flowered, ± sessile.
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7
3Leaves covered with rather stiff hairs or, if almost glabrous, with a few stiff hairs only near apex; calyx glabrous externally or with a sparse to moderate cover of stiff hairs.Dillwynia phylicoides
Leaves glabrous; calyx glabrous externally, usually shortly ciliate with weak hairs.
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4
4Erect to diffuse shrubs 0.5–2.5 m high.5
Weak ascending shrubs <0.5 m high.
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6
5Leaves mostly >5 mm long; widespread, north from the Budawang Ra. (NC, CC, SC, CT, NWS).Dillwynia retorta
Leaves mostly 1–5 mm long; restricted to the Cumberland Plain, and to Douglas Park (CC).
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Dillwynia parvifolia
6Peduncles 5–15 mm long; widespread, grows in heaths and open woodlands (NC, CC, CT, ST).Dillwynia sp. trichopoda (Maiden & Boorman s.n. NSW 40290)
Peduncles 11–28 mm long; restricted to alpine swamp margins (ST).
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Dillwynia palustris
7Leaves flattened or trigonous in section, branchlets with long spreading to antrorse hairs; on coastal sand and sandstone, north from Ulladulla (NC, CC, SC).Dillwynia floribunda
Leaves terete or almost so, branchlets with short appressed hairs; on rocky sandstone ridges from Port Jackson to near Rylstone (CC, CT).
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Dillwynia elegans
8Calyx tapering gradually towards the base; petals not persistent in fruit.9
Calyx abruptly narrowed at the base; pods surrounded by the persistent remains of the petals.
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20
9Calyx tube hairy.10
Calyx tube glabrous.
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13
10Inflorescences with peduncles 0.5 mm or longer.11
Inflorescences with ± sessile flowers or peduncles <0.5 mm long.
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12
11Lateral stems and branchlets spinescent.Dillwynia ramosissima
Lateral stems not spinescent.
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Dillwynia hispida
12Leaves mostly <10 mm long, smooth to sparsely warty.Dillwynia sericea
Leaves mostly >10 mm long, strongly warty.
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Dillwynia rudis
13Prominent decurrent leaf bases absent.14
Prominent decurrent leaf bases present.
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18
14Leaves with apex strongly hooked (as opposed to apex recurved)15
Leaves with apex ± straight (sometimes recurved but not strongly hooked).
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16
15Inflorescences 1–4-flowered, corymbose on peduncles >3 mm long.Dillwynia glaberrima
Inflorescences 1–2-flowered, at the end of lateral branches on peduncles <3 mm long.
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Dillwynia tenuifolia
16Plants prostrate.Dillwynia prostrata
Plants erect.
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17
17Inflorescences 2-flowered; on rocky sandstone ridges from Port Jackson to near Rylstone (CC, CT).Dillwynia elegans
Inflorescences 1-flowered; known from the Windellama, Michelago and Numeralla areas (ST).
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Dillwynia glaucula
18Stipules present; inflorescences 2-flowered19
Stipules absent; inflorescences 1-flowered.
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Dillwynia sp. Barren Grounds (Chadwick s.n. NSW 39509)
19Stipules 0.5–1.5 mm long; grows in swampy heaths.Dillwynia stipulifera
Stipules 0.1–0.5 mm long; grows in heath near escarpments.
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Dillwynia cripii
20Leaf apex either obtuse or if acute without an obvious sharp or pungent point.21
Leaves with an obvious sharp to pungent point.
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23
21Inflorescences sessile, dense, terminal heads.Dillwynia brunioides
Inflorescences racemose, corymbose or single-flowered, terminal or axillary, never forming sessile, terminal heads.
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22
22Flowers pedunculate; bracteoles narrow-lanceolate, caducous; from between Deniliquin and Moama (SWP).Dillwynia cinerascens
Flowers sessile; bracteoles broad-lanceolate to ovate, persistent; known from near Bathurst, Yass, Canberra and Tarcutta (CT, ST, SWS).
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Dillwynia sp. Yetholme (P.C. Jobson 5080)
23Leaves terminated by a distinctly pungent point 1–1.5 mm long.24
Leaves terminated by a sharp but not pungent point 0.2–0.5 mm long.
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25
24Leaves sessile.Dillwynia juniperina
Leaves with short yellowish petiole, 0.4–1.2 mm long.
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Dillwynia sieberi
25No obvious leaf base scars; standard 7–9 mm long; from the Goulburn R. to Bargo (CC, CT, CWS).Dillwynia acicularis
Obvious leaf base scars present; standard 9–12 mm long; from Gibraltar Ra. to Ebor district (NT).
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Dillwynia rupestris

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