Template:Christensen et al., 2014

• Christensen, K.I. et al. 2014: Crataegus ×ninae-celottiae and C. ×cogswellii (Rosaceae, Maleae), two spontaneously formed intersectional nothospecies. PhytoKeys, 36: 1–26. DOI: 10.3897/phytokeys.36.6784  
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