Flora of North America species comparison

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Braya humilis subsp. humilis
Photo is of parent taxon

dwarf braya
Stems

ascending to erect, branched or unbranched, 0.4–3.3 dm, sparsely to moderately pubescent.
Leaves

blade margins sinuate-dentate, shallowly pinnatifid, or entire, surfaces moderately pubescent.
Flowers

petals white, pink, or purple, 2.5–6.9(–7.5) × (0.7–)0.9–4(–4.2) mm.
Fruits

usually fertile and fully developed, somewhat torulose, 0.6–1.2(–1.3) mm wide;

septum not fenestrate or split longitudinally.
2n

= 28, 42, 56, 70.

Braya humilis subsp. humilis
Phenology Flowering May–Jul.
Habitat Sandy, gravelly soil along streams, lakeshores, roadsides, moraines, open stony slopes, dolomite cliffs and slopes, limestone ledges, solifluction soils
Elevation 0-4000 m (0-13100 ft)
Distribution
from FNA
AK; CO; MI; MT; VT; WY; AB; BC; MB; NF; NT; NU; ON; QC; YT; Greenland; e Asia; c Asia
[BONAP county map]
Discussion

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.)
Source FNA vol. 7, p. 549.
Parent taxa Brassicaceae > tribe Euclidieae > Braya > Braya humilis
Sibling taxa
B. humilis subsp. ellesmerensis, B. humilis subsp. maccallae, B. humilis subsp. porsildii
Synonyms Arabidopsis novae-angliae, B. humilis var. abbei, B. humilis subsp. arctica, B. humilis var. arctica, B. humilis var. interior, B. humilis var. laurentiana, B. humilis var. leiocarpa, B. humilis var. novae-angliae, B. humilis subsp. richardsonii, B. humilis subsp. ventosa, B. humilis var. ventosa, B. intermedia, B. novae-angliae, B. novae-angliae subsp. abbei, B. novae-angliae var. interior, B. novae-angliae var. laurentiana, B. novae-angliae subsp. ventosa, B. richardsonii, Pilosella novae-angliae, Pilosella richardsonii, Torularia humilis subsp. arctica
Name authority unknown
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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