It would be premature at this point to write keys to the exotic species. It’s still too easy to find new additions. Here’s a copy of the keys to sections that appears in paper:
1a Plants usually growing in wild vegetation at high elevations or latitudes; bracts sometimes strongly corniculate, the outer ones mostly erect to appressed, sometimes recurved or spreading; leaves mostly either weakly lobed or with simple lobes … (Native groups, not treated here)
1b Plants mostly in disturbed vegetation, mostly at low to middle elevations and latitudes; bracts not corniculate or with small, inconspicuous horns, the outer ones mostly spreading, recurved or reflexed; leaves mostly deeply lobed, the lobes in most cases longer than wide and often again lobed … 2 (Exotic sections)
2a Outer bracts erect and appressed, blackish green, ovate and with blunt apices; plants usually in wet sites; not documented from British Columbia, but to be sought …[Section Palustria ]
2b Outer bracts spreading to recurved, or if appressed, then apices acute to acuminate; habitat various, but usually not in wet sites … 3
3a Inner and/or outer bracts minutely corniculate; outer bracts mostly <10 mm long, mostly thin and pale, usually pinkish … 4
4a Cypsela cone slender, scarcely tapered, usually >0.7 mm, cypsela body often red- or purple-brown … Section Erythrosperma
4b Cypsela cone stout and upwardly tapered, usually <0.7 mm, cypsela body pink-brown … Taraxacum fulvicarpum group
3b Inner and outer bracts not at all corniculate (though sometimes with 1-2 minute ridges at apex; outer bracts various, but often >10 mm long and usually opaque or dark and without pink tones … 5
5a Involucre often distinctly glaucous (alive), blackish green and glossy (dried); outer bracts ovate, lanceolate or sometimes oblong-lanceolate … 6
6a Leaves mostly olive-green, lateral lobes usually 4 per side and hamate; outer bracts comparatively abruptly tapered; mostly robust plants … Section Hamata
6b Leaves mostly dark bluish green, lateral lobes usually <4 per side and mostly not hamate; pollen often absent … 7
7a Leaves not spotted (except often at the internodes, or spotted due only to injury); pollen often lacking; locally common … Section Celtica
7b Leaves purple spotted, the adaxial spots corresponding to abaxial ones; pollen present (ours); rarely encountered … Section Naevosa
5b Involucre rarely glaucous, not appearing blackish or varnished in the pressed state; outer bracts mostly oblong or lance-oblong … 8
8a Outer bracts mostly >10 mm long; leaves mostly crisped and/or rugose, summer leaves almost always complexly lobed; pollen rarely absent … Section Taraxacum
8b Outer bracts mostly <10 mm long; leaves often not crisped and mostly not rugose; summer leaves mostly weakly lobed or merely dentate; pollen often absent … 9
9a Petioles with no wings or wings narrow; summer leaves usually oblanceolate or obovate in outline; capitula usually comparatively small; ligules deep yellow, the outer ones with dark abaxial stripes … Section Borea
9b Petioles with broad green wings to base or nearly so; summer leaves often oblong; capitula usually comparatively large; ligules often comparatively pale, the outer ones often with pale abaxial stripes … Section Boreigena