Syst. Nat. ed. 12, 2: 323, 327. 1767
Mant. Pl. 1: 74. 1767
Shrubs, evergreen, sometimes forming clumps wider than high, 0.5–2(–4) dm. Leaves alternate, sessile; blade 1-veined from base, acerose to subulate or scalelike, margins sometimes ± revolute, surfaces glabrescent or hairy, hairs usually simple, not stellate. Inflorescences solitary flowers. Pedicels present or absent; bracts present or absent Flowers chasmogamous; sepals persistent or tardily falling, 5; petals 5, usually yellow, sometimes white; stamens 8–30+; filaments distinct or bases weakly connate; carpels 3; styles 1; stigmas 1, minutely 3-toothed. Capsules 3-valved. Seeds 3–6 per capsule. x = 10.
Species 3 (3 in the flora).
Species of Hudsonia are wiry shrubs or shrublets with crowded, acerose to subulate, or scalelike, leaves and the aspect of diminutive gymnosperms or overgrown mosses; they sometimes form relatively extensive stands.
|1||Leaf blades mostly lanceolate-ovate, (scalelike), 1–2(–3+) mm; leaves usually appressed (to stems); pedicels 0–1(–5) mm; ovaries glabrous or glabrescent.||Hudsonia tomentosa|
|1||Leaf blades acerose to subulate, 2–7 mm; leaves weakly spreading; pedicels mostly 4–10(–16) mm; ovaries usually hairy||> 2|
|2||Sepal apices acute to acuminate; ovaries proximally glabrous or glabrescent, distally hairy.||Hudsonia ericoides|
|2||Sepal apices acuminate to attenuate; ovaries hairy ± throughout.||Hudsonia montana|