1	"Compound heads lacking; achene attached obliquely to the corolla, with globose hairs on the abaxial surface only"	"Siloxerus multiflorus"
1	"Compound heads present; achene not attached obliquely to the corolla, with globose hairs distributed over the entire surface"	2
2	"Stem apparently absent; compound heads depressed ovoid, c. 0.4–0.6 cm long, 0.6–1.1 cm diam."	"Siloxerus pygmaeus"
2	"Stem simple or branching, the major axes decumbent to erect, 1–7(–9) cm long, compound heads ellipsoid to broadly ellipsoid or ovoid to broadly depressed ovoid, c. 0.6–2.9 cm long, c. 0.5–1.5 cm diam."	3
3	"Pappus c. half or rarely the length of the floret; capitular bracts and paleae (2–)2.5–4.5(–6.3) mm long"	"Siloxerus humifusus"
3	"Pappus c. equal to or slightly exceeding the length of the floret; capitular bracts and paleae 1.25–1.90 cm long"	"Siloxerus filifolius"