Pittonia4: 224. 1900
w United States.
Species 3 (3 in the flora).
Oreostemma is distinguished by its basal rosettes of narrow, 3-nerved leaves, single heads on scapose stems, turbinate involucres with (2–)3–4 subequal series of herbaceous phyllaries, white rays, long style-branch appendages, and cylindric cypselae. The species mostly have been previously treated within Aster.
|1||Plants 2–7 cm; stems, phyllaries, and often leaves sparsely villous to glabrate, densely short-stipitate-glandular; leaf blades linear||Oreostemma peirsonii|
|1||Plants 4–70 cm; stems, leaves, and phyllaries glabrous or villous, eglandular; leaf blades oblanceolate||> 2|
|2||Stems, leaves, and phyllaries villous to glabrate, at least some hairs always perceptible on distal stems and proximal portions of phyllaries; phyllaries herbaceous or slightly tawny-indurate proximally, outer 0.8–1.2 mm wide proximally, 1-nerved||Oreostemma alpigenum|
|2||Stems, leaves, and phyllaries glabrous; phyllaries strongly indurate-stramineous proximally, outer 1.5–2 mm wide proximally, 3-nerved (nerves separating phyllary into 4 longitudinal bands)||Oreostemma elatum|
|Author||Guy L. Nesom +|
|Common name||Mountaincrown +|
|Etymology||Greek oreo, mountain, and stemma, crown +|
|Illustrator||Barbara Alongi +|
|Reference||cronquist1948a + and nesom1993f +|
|Taxon name||Oreostemma +|
|Taxon parent||Asteraceae tribe Astereae +|
|Taxon rank||genus +|
|Volume||Volume 20 +|