Perilla seeds

Perilla
Perilla frutescens
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Eudicots
(unranked):	Asterids
Order:	Lamiales
Family:	Lamiaceae
Genus:	Perilla L.

Perilla is a genus consisting of one major Asiatic crop species P. frutescens and a few recognized wild species in nature, belonging to the mint family, Lamiaceae. It encompasses several distinct varieties of Asian herb, seed, and vegetable crop, including P. frutescens (deulkkae) and P. frutescens var. crispa (shiso). The genus name Perilla is also a frequently employed common name ("perilla"), applicable to all varieties. Perilla varieties are cross-fertile and intra-specific hybridization occurs naturally. Some varieties are considered invasive.

The classification of Perilla is confused, partly because botanists struggled with distinguishing the two distinct cultigens (as different species or variations). Until a few decades ago, P. frutescens var. crispa was regarded as a species in its own right, distinct from P. frutescens, although it was well established that these types readily cross-pollinate. An early example of dividing the two cultigens into different species is found in Matsumura's nomenclature book in 1884, where the synonym P. arguta Benth. is applied to P. frutescens var. crispa, and the synonym P. ocymoides L. was applied to P. frutescens. However the species name P. ocymoides or P. ocimoides has been used to denote P. frutescens var. crispa for a long time, especially by the Japanese, so it should not be considered a synonym for either cultigen interchangeably. Recent genetic researches confirm they are of a common gene pool, corroborating the taxonomists' claim for consolidating the two crops into one species.

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Wikipedia