Noccaea arctica
arctic pennycress
simple or several from caudex, erect, unbranched, 0.5–1.8 dm.
petiole 0.4–1.3 cm;
blade oblanceolate to spatulate, 0.3–1.8 cm × 2–4 mm, base cuneate or attenuate, margins entire, apex obtuse.
3–7;
blade ovate or suboblong, 0.5–1 cm × 1–5 mm, base minutely auriculate, margins entire, apex obtuse to subacute.
0.5–6 cm.
sepals 1.5–2.5 × 0.5–1 mm, (margins white);
petals white, 3–5 × 2–2.5 mm, often flaring between blade and claw, apex rounded;
filaments 2–3 mm;
anthers ca. 0.5 mm.
ascending to horizontal, straight, 3–8 mm.
not winged, narrowly obovate, 6–10 × 2–3.5 mm, base cuneate, apex obtuse;
ovules 8–14 per ovary;
style (0.3–)0.6–1 mm.
yellow-brown, 1.5–2 mm, nearly smooth.
= 14.
Noccaea arctica
Noccaea arctica is rare, known from a limited number of collections. P. K. Holmgren (1971) suggested that additional collections might indicate that it is a variety of N. fendleri (as Thlaspi montanum).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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