Darwin, Charles: On the specific difference between primula veris, Brit. Fl. (var. officinalis of Linn.), P. vulgaris, Brit. Fl. (var. acaulis, Linn.), and P. elatior, [...] : and on the hybrid nature of the commom Oxlip : with supplementary remarks on naturally-produced hybrids in the genus verbascum. [London] : [s. n.], [18--], 18uu
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