1	"Plants with reduced, scattered leaves with a maximum length under 2 mm"	"Lechenaultia aphylla"
1	"Plants with obvious leaves that are usually crowded and longer than 2 mm"	2
2	"Corolla tube forming a complete, erect cylinder"	3
2	"Corolla tube open to base on the adaxial side"	12
3	"Corolla tube gibbous on adaxial side"	4
3	"Corolla tube not gibbous"	6
4	"Sepals greater than 7.5 mm long"	"Lechenaultia chlorantha"
4	"Sepals less than 6.5 mm long"	5
5	"Stems with curved downs tips; tangled, shrubby habit"	"Lechenaultia linarioides"
5	"Stems without curved down tips; prostrate or shortly erect habit"	"Lechenaultia formosa"
6	"Plants hispid"	"Lechenaultia hirsuta"
6	"Plants glabrous"	7
7	"Plants wreath-like, procumbent herbs; corolla lobe wing 4.5–8.5 mm wide"	"Lechenaultia macrantha"
7	"Plants not wreath-like or procumbent; corolla lobe wings <4.5 mm wide"	8
8	"Sepals > 16.5 mm long"	"Lechenaultia longiloba"
8	"Sepals < 7.5 mm long"	9
9	"Fruit < 7 mm; corolla ≤ 17 mm long"	"Lechenaultia tubiflora"
9	"Fruit > 12 mm long; corolla ≥ 17 mm long"	10
10	"Corolla lobe wings 0.1–0.2 mm wide; sepals < 5 mm long"	"Lechenaultia acutiloba"
10	"Corolla lobe wings > 0.9 mm wide; sepals > 5 mm long"	11
11	"Articles 5-8 pairs"	"Lechenaultia superba"
11	"Articles 10-20 pairs"	"Lechenaultia laricina"
12	"Plants papillate (leaves, sepals and ovary)"	13
12	"Plants not papillate"	14
13	"Sepals < 5 mm long; corolla < 14 mm long"	"Lechenaultia papillata"
13	"Sepals > 6 mm long; corolla > 16 mm long"	"Lechenaultia magnifica"
14	"Plants grass-like herbs"	15
14	"Plants sub-shrubs or non grass-like herbs"	17
15	"Sepals all of equal length"	"Lechenaultia juncea"
15	"Central sepal longer than others"	16
16	"Corolla 9.5–19 mm long, pale mauve with a white throat, lacking any yellow markings; articles more simple, elongate and irregularly cylindrical, with a low, elongate furrow on each side"	"Lechenaultia mimica"
16	"Corolla 13.5–25 mm long, rich dark purple (rare pale mauve forms known); articles complex, in side view consisting of a thin plate with a ‘cushion’ on each face, each cushion raised to a thick diverging short spur at each end, to create a trilobed apex at each end"	"Lechenaultia filiformis"
17	"Leaves hairy"	"Lechenaultia pulvinaris"
17	"Leaves glabrous"	18
18	"Sepals < 2.5 mm long"	"Lechenaultia subcymosa"
18	"Sepals > 3 mm long"	19
19	"Leaves adpressed to strongly upheld"	20
19	"Leaves not adpressed or only incurved"	21
20	"Style 15 - 19 mm long; hairs in the corolla throat 0.1 - 0.4 mm long"	"Lechenaultia orchestris"
20	"Style 5 - 9 mm long; hairs in the corolla throat 0.4 - 1 mm long"	"Lechenaultia galactites"
21	"Style > 11 mm long"	22
21	"Style < 10 mm long"	23
22	"Leaves 7.5 - 13 mm long; flowers 13 - 19 mm long"	"Lechenaultia stenosepala"
22	"Leaves mostly 2.5 - 5 mm long, reaching up to 8.5 mm only in upper stems below inflorescence; flowers 19 - 28 mm long"	"Lechenaultia orchestris"
23	"Corolla predominantly blue"	24
23	"Corolla pale yellow to orange–yellow to white"	31
24	"Sepals to 4.5 mm long or less"	25
24	"Sepals 4.5 mm long or greater"	26
25	"Leaves on non-flowering stems crowded and scattered on flowering stems; fruit to 22-29 mm long"	"Lechenaultia brevifolia"
25	"Leaves all crowded; fruit 11-18 mm long"	"Lechenaultia floribunda"
26	"Style > 9.5 mm long"	"Lechenaultia heteromera"
26	"Style < 9 mm long"	27
27	"Ovary < 6.5 mm long"	"Lechenaultia expansa"
27	"Ovary > 11 mm long"	28
28	"Virgate, few branched herb; interior arid distribution"	"Lechenaultia striata"
28	"Weakly erect to spreading, moderately branched shrub or subshrub; south-west distribution"	29
29	"Stems fleshy; corolla thick and artificial in appearance"	"Lechenaultia hortii"
29	"Stems mostly woody; corolla thin"	30
30	"Style 15 - 19 mm long; hairs in the corolla throat 0.1 - 0.4 mm long"	"Lechenaultia orchestris"
30	"Style 5 - 9 mm long; hairs in the corolla throat 0.4 - 1 mm long"	"Lechenaultia biloba"
31	"Articles 10-13 Pairs; sepals to 4.5 mm long or less"	"Lechenaultia lutescens"
31	"Articles 16-20 pairs; sepals 4.5 mm long or greater"	"Lechenaultia striata"