Flora of North America species comparison

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Braya humilis subsp. porsildii

Braya humilis subsp. maccallae
Photo is of parent taxon

Porsild's dwarf braya
Photo is of parent taxon

dwarf braya, maccall's dwarf braya, mccalla's dwarf braya
Stems

ascending to erect or, rarely, decumbent, usually unbranched, 0.3–1.7(–2.5) dm, densely pubescent.

ascending to erect, often unbranched, 0.4–2.3 dm, moderately pubescent.
Leaves

blade margins usually entire, sometimes weakly sinuate-dentate, surfaces densely pubescent.

blade margins entire or, sometimes, sinuate-dentate, surfaces glabrescent to moderately pubescent.
Flowers

petals white, 4.4–6.9 × (1.9–)2.3–4.2 mm.

petals white, (4.4–)4.9–6.7(–7.2) × (2.1–)2.3–4(–4.2) mm.
Fruits

often abortive, somewhat torulose, 0.8–1.2 mm wide when fully developed;

septum not fenestrate or split longitudinally.

often abortive, somewhat torulose, 0.7–1.2 mm wide when fully developed;

septum not fenestrate or split longitudinally.
2n

= 28.

= 28.

Braya humilis subsp. porsildii

Braya humilis subsp. maccallae
Phenology Flowering May–Jul. Flowering May–Jul.
Habitat Dry alpine scree slopes, glacial moraines, and gravel bars, often on limestone gravels and soils Sandy gravelly riverbanks and floodplains, sometimes on slopes and glacial moraines
Elevation 500-3000 m (1600-9800 ft) 1500-3000 m (4900-9800 ft)
Distribution
from FNA
AB; BC; NT
[BONAP county map]
from FNA
AB; BC
[BONAP county map]
Discussion

Subspecies maccallae and porsildii share the large flowers, high percentage of abortive fruits, and leaf margins mostly entire, but they differ in indumentum and habitats.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Subspecies maccallae differs from subspp. elesmerensis and humilis in having leaf margins mostly entire, flowers exceptionally large, and a high percentage of abortive fruit. Cauline leaves are much reduced and arise from the base of the stem, giving an almost acaulescent appearance to the plant. Breeding studies (J. G. Harris 1985) indicate that subspp. maccallae and porsildii are self-incompatible, while most subspecies of Braya humilis are strongly autogamous.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 7, p. 550. FNA vol. 7, p. 550.
Parent taxa Brassicaceae > tribe Euclidieae > Braya > Braya humilis Brassicaceae > tribe Euclidieae > Braya > Braya humilis
Sibling taxa
B. humilis subsp. ellesmerensis, B. humilis subsp. humilis, B. humilis subsp. maccallae
B. humilis subsp. ellesmerensis, B. humilis subsp. humilis, B. humilis subsp. porsildii
Name authority J. G. Harris: Novon 16: 348. (2006) J. G. Harris: Novon 16: 346. (2006)
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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