1	"Flowers only in terminal or lateral racemes; inflorescences opening from the base"	2
1	"Flowers usually paired in axils of deciduous leaves (rarely with extremely short lateral racemes); flowers opening from the apex of flowering branches (pseudo-inflorescences)"	7
2	"Leaves persistent on mature flowering branches; style with prominent hairs around the stigma and without a sub-apical membranous wing"	3
2	"Leaves present only on juvenile branches; style with a sub-apical membranous wing, with or without a few hairs"	5
3	"Leaves oblanceolate, concentrated at the base of inflorescences (WA: Augusta to Albany, Stirling Ra. NP & Cape Le Grand NP)"	"Sphaerolobium nudiflorum"
3	"Leaves linear-subulate, present along the length of flowering branches"	4
4	"Bracts and bracteoles persistent on mature plant; flowers 7–12 mm long (WA: Jurien to Esperance)"	"Sphaerolobium linophyllum"
4	"Bracts and bracteoles caducous; flowers 5–6 mm long (WA: Kalbarri area)"	"Sphaerolobium gracile"
5	"Inflorescence a terminal raceme; keel petal much longer than wings (WA: Busselton to Albany, Stirling Ra. NP, Fitzgerald River NP)"	"Sphaerolobium scabriusculum"
5	"Inflorescence a lateral raceme; keel petal ±equal to wings"	6
6	"Stems winged; calyx green with broad black bands; flowers yellow (WA: Walpole to Albany & N to Cranbrook)"	"Sphaerolobium alatum"
6	"Stems terete; calyx olive green to brown; flowers orange and red (WA: Cowaramup to Augusta, Fitzgerald River NP)"	"Sphaerolobium racemulosum"
7	"Calyx mid- to dark green with distinct black spots throughout on fresh and dried material; bracts, bracteoles, pedicels and leaves coloured as for calyx"	8
7	"Calyx pale green, olive green or light brown, sometimes with fine green to brown spots towards lobe apices on fresh material, often drying uniformly grey; bracts, bracteoles, pedicels and leaves coloured as for calyx"	17
8	"Keel apex acuminate to rostrate"	9
8	"Keel apex acute, obtuse or truncate"	10
9	"Calyx tube c. 1/3 length upper lip; style flattened but lacking a prominent sub-apical wing; ovary pale green (WA: Mt Lesueur NP to Fitzgerald River NP)"	"Sphaerolobium medium"
9	"Calyx tube c. equal in length to upper lip; style with broad, fringed, sub-apical wing; ovary yellow with dark green-brown patches (WA: Walpole area)"	"Sphaerolobium rostratum"
10	"Dorsal surface of anthers with orange to red, hastate to oblong appendages when dry; calyx lobe margins often diffusely purplish grey to grey-black"	11
10	"Dorsal surface of anthers lacking orange to red appendages when dried; calyx lobe margins with a distinct black line"	13
11	"Sub-apical stylar wing broad (0.3–0.8 mm wide), margin lacking a fringe or with very sparse villi; corolla orange-red or pink-purple, occasionally cream; standard eye domed to cordate (WA: Geraldton to Cape Arid NP)"	"Sphaerolobium drummondii"
11	"Sub-apical stylar wing narrow (0.1–0.2 mm wide), margin fringed; corolla all yellow, or yellow with red or pink; standard eye oblong to stellate"	12
12	"Branches short and thick (1.4–2.4 mm in mid-flowering region, 1.8–2.7 mm near base of plant); standard apex emarginate; standard eye stellate; sub-apical stylar wing 0.5–0.7 mm long (WA: Bremer Bay to Esperance)"	"Sphaerolobium validum"
12	"Branches long and slender (0.85–1.5 mm in mid-flowering region, 1.2–1.9 mm near base of plant); standard apex entire; standard eye ±oblong; sub-apical stylar wing 1.2–1.4 mm long (WA: Collie, Augusta, Mt Lindesay, Walpole)"	"Sphaerolobium benetectum"
13	"Standard petal longer than the keel; sub-apical stylar wing ±semicircular (0.6–2.4x longer than wide)"	14
13	"Standard petal equal to or shorter than the keel; sub-apical stylar wing elongate (3–8x longer than wide)"	15
14	"Keel strongly incurved on adaxial edge to geniculate; ovary green-black; style geniculate with the apex hooked (WA: Walpole to Albany & Stirling Range NP)"	"Sphaerolobium grandiflorum"
14	"Keel arcuate on adaxial edge; ovary pale green to yellow; style curved smoothly over ovary (WA: Perth to Esperance; Qld.; NSW; SA; Vic.; Tas.)"	"Sphaerolobium vimineum"
15	"Stems 0.4–0.9 mm wide in the mid-flowering region; phyllotaxis usually opposite-decussate; standard yellow and red, reverse of blade distinctly dark red to apex (WA: Witchcliffe to Albany)"	"Sphaerolobium fornicatum"
15	"Stems 0.8–1.8 mm wide in the mid-flowering region; phyllotaxis alternate-spiralled; standard yellow and red or pink-orange to dark pink-red, reverse of blade red at base but dissipating towards apex"	16
16	"Calyx tube 0.5–0.75x upper lip length; standard yellow and red with a triangular eye; ovary 1.3–2x stipe length; sub-apical stylar wing c. 1/3x style length (WA: Yanchep to Bunbury, Wilson Inlet)"	"Sphaerolobium calcicola"
16	"Calyx tube 0.9–1.3x upper lip length; standard pink-orange to dark pink-red with an inversely triangular to ‘Y’-shaped eye; ovary 0.7–1x stipe length; sub-apical stylar wing c. 1/7–1/5x style length (WA: Gingin, Margaret River to Albany)"	"Sphaerolobium hygrophilum"
17	"Calyx, bracts, bracteoles and pedicels covered with spreading white hairs (WA: Walpole to Green Range)"	"Sphaerolobium pubescens"
17	"Calyx, bracts, bracteoles and pedicels glabrous"	18
18	"Keel petal much longer than wings and standard, adaxial and abaxial margins arcuate; pseudo-inflorescences 10–40 cm long (WA: Eneabba to Cape Arid NP)"	"Sphaerolobium macranthum"
18	"Keel petals ±equal to wings and standard, adaxial margin ±straight, abaxial margin arcuate; pseudo-inflorescences 1–10 cm long"	19
19	"Branches and branchlets with spinescent apices"	20
19	"Branches and branchlets not spinescent at apices"	21
20	"Stems scabrous, branchlets often 3–5 forked. (Vic.: Grampians)"	"Sphaerolobium acanthos"
20	"Stems smooth, branchlets usually undivided (WA: Albany to Cape Arid NP)"	"Sphaerolobium daviesioides"
21	"Corolla pink-purple, 5–10 mm long (WA: Cataby to Arrino)"	"Sphaerolobium pulchellum"
21	"Corolla yellow or yellow and red, ±5 mm long (Qld; NSW; SA; Vic.; Tas.)"	"Sphaerolobium minus"