Braya humilis subsp. humilis
Braya humilis subsp. ellesmerensis
dwarf braya
ascending to erect, branched or unbranched, 0.4–3.3 dm, sparsely to moderately pubescent.
usually ascending (prostrate in fruit), unbranched, 0.3–1.6 dm, moderately pubescent.
blade margins sinuate-dentate, shallowly pinnatifid, or entire, surfaces moderately pubescent.
blade margins pinnatifid or entire, surfaces moderately pubescent.
petals white, pink, or purple, 2.5–6.9(–7.5) × (0.7–)0.9–4(–4.2) mm.
petals white or purple-tinged, (3–)4–5.6 × (1.3–)2–3.3(–3.8) mm.
usually fertile and fully developed, somewhat torulose, 0.6–1.2(–1.3) mm wide;
septum not fenestrate or split longitudinally.
usually fertile and fully developed, not or weakly torulose, (1–)1.2–1.8(–2) mm wide;
septum often fenestrate (with circular perforations at regular intervals longitudinally or with a narrow, elliptical, longitudinal split at base or both).
= 28, 42, 56, 70.
= 42.
Braya humilis subsp. humilis
Braya humilis subsp. ellesmerensis
Subspecies humilis is extremely variable morphologically. In a general way, morphological form correlates with ploidy level, e.g., tetraploids, octoploids, and decaploids tend to be short in stature with small leaves. Hexaploids are less predictable. They range from short plants with small leaves to large, robust, multi-branched plants with large, pinnatifid leaves. Attempting to segregate most morphological forms of Braya humilis into logical infraspecific taxa is an exercise in futility. Populations that appear distinctive in the field almost always blur imperceptibly into the larger subsp. humilis continuum when compared with other populations from across the range of distribution. Subspecies humilis is broadly distributed on calcareous substrates in arctic, subarctic, alpine, and boreal regions of North America and Asia.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Prostrate fruiting stems, exceptionally broad, non-torulose fruits, and fenestrate silique septae distinguish subsp. ellesmerensis from other subspecies of Braya humilis. It is known only from northern Ellesmere Island.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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