Amorphophallus konjac

Common Name: Devil's Tongue

Family: Araceae

Synonym(s): Amorphophallus rivieri Durand ex Carrière, Proteinophallus rivieri (Durand ex Carrière) Hook.f.

Country of Origin: China (Yunnan)

Description: Much grown from Indonesia to Japan for edible corms.

Tuber about 10 in. across, flattish round. l. stalk 15 to 30 in. long, brownish green spotted white; blade large, 3-sect, ultimate segs. oblong-elliptic, cuspidate. Peduncle 2 ft. long. Spathe 8-12" long, ovate, tube about 3" long, pale green with greenish white spots, margin purplish, blade 8" long, wide roundish-cordate, acute, green without, dark purple within, margin undulate.

Uses: It is commonly eaten in Japan, where it is called konnyaku, as noodles or an ingredient in soups and stews. The tubers are raised and then cooked and treated with limewater to remove toxic calcium oxalate, resulting in a final product somewhat stiffer than gelatin. It is sold in blocks like tofu in grocery stores. The name Amorphophallus is not generally associated with the product to the lay person.

The main substance in konjac is called Glucomannan which has a low caloric content but is rich in dietary fiber. Clinical study indicates the Glucomannan may be responsible for weight reduction and reducing cholesterol in those who have high cholesterol. It is eaten in Japan to clean the digestive tract of toxins.

USDA Zone: 6a-11

Accession #: 198500882

Accession Date: 1997-02-04 00:00:00

Confirmed At: 2026-03-10 19:18:38

Bloom Status: 🪴 Not Flowering

Location: 2201

Quantity: 4

Source: Unknown

Culture: Corm can be stored dry.

Division: Magnoliophyta

Class: Liliopsida

Subclass: monocots

Order: Alismatales

Family: Araceae

SubFamily: Aroideae

Tribe: Thomsonieae