Thyrsiflora:  Answers to key questions in Budd's Flora (BF) and Flora of Alberta (FOA) leading to this species.   leaves attenuate at base, scarcely petioled; NOT [leaves petiolate] leaves glandular-dotted plants with flowers; NOT [plants not flowering but with bulblets in the upper leaf axils] inflorescence axillary; NOT [inflorescence terminal] flowers in peduncled racemes from leaf-axils; NOT [flowers borne on separate stalks in leaf-axils, sometimes appearing in whorls of 4] inflorescence dense; NOT [inflorescence loose] corolla-lobes linear; NOT [corolla-lobes broad]

 

Lysimachia: Answers to key questions in Budd's Flora and Flora of Alberta leading to this genus.  plants perennial; NOT [plants annual] erect plants; NOT [depressed plants], NOT [procumbent plants] leaves all or chiefly cauline; NOT [leaves in a basal rosette or clustered at the ends of short branches of the caudex] leaves opposite; NOT [leaves mostly alternate, the lower ones sometimes opposite], NOT [leaves clustered near the top of the stem] flowers rarely in definite umbels; NOT [flowers commonly in terminal umbels] corolla present corolla yellow; NOT [corolla white], NOT [flowers scarlet] capsule opening lengthwise; NOT [capsule circumscissile]

Primulaceae:  Answers to key questions in Budd's Flora leading to this family.  The answers do not apply to all genera of Primulaceae found on the Canadian prairies, but they do apply to Lysimachia. herbs; NOT shrubs or trees plants green or with some chlorophyll plants NOT twining plants WITHOUT milky juice flowers NOT in heads or spikes; NOT [flowers in long or short spikes], NOT [flowers in heads or in form resembling a head] flowers with two floral rings, but with the petals wholly or partly united forming a tube or bell corolla regular stamens directly in front of corolla lobes; NOT [stamens alternating with corolla lobes, or twice their number] ovary superior