different types of black rice

wild rice varieties are taller than ours and mostly grown in North America, whereas Chinese black rice is shorter and rounder

differences between wild and black rice

every rice variety is outlined in a biological nomenclature, based on origin and length-to-width ratio

Without such a taxonomic name, a variety can't be exported nor imported.

Phytosanitary documents, necessary for international transport, are issued by agricultural department agencies and mention at least genus and species.

ORYZA SATIVA stands for domesticated Asian rice

Most Asian rice is domesticated and belongs to the genus oriza and species sativa.

Wild rice on the other hand is (domesticated) North American rice, belongs to the genus zizania, a family of aquatic grasses, and grows in shallow waters in a moderate climate. Harvesting is different as well.

We don't grow wild rice in Thailand. It's not the ecosystem for it.

Wild rice is taller and slimmer than our rice.

our heirloom black rice is a South Asian long grain variety, an INDICA subspecies

Varieties grown in Central Asia, like Chinese and Japanese rice belong to a subspecies called JAPONICA, a group of short-mid grain cultivars.

South Asian rice, like ours, belongs to a subspecies called INDICA, and is mostly long grain. Length about 4 times as long as its width, per definition.

Chinese rice is shorter and rounder than our rice.

For our Thai heirloom black rice, add the subcultivar name to it and you get the full scientific name: ORYZA SATIVA INDICA SC. KHAO HOM NIL.