Arisaema thunbergii subsp. urashima or Arisaema urashima is a herbaceous

Herbaceous

A herbaceous plant is a plant that has leaves and stems that die down at the end of the growing season to the soil level. They have no persistent woody stem above ground...

 perennial plant

Perennial plant

A perennial plant or simply perennial is a plant that lives for more than two years. The term is often used to differentiate a plant from shorter lived annuals and biennials. The term is sometimes misused by commercial gardeners or horticulturalists to describe only herbaceous perennials...

. It is widespread through the woodlands of Japan

Japan

Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...

 and is one of the most curious-flowered arisaema

Arisaema

Arisaema is a genus of about 150 species in the flowering plant family Araceae, native to eastern and central Africa, Asia and eastern North America. Its species are often called Cobra lilies, particularly the Asiatic species...

s. This variety represent the most southerly population of A. thunbergbii. The plant has a purple bract

Bract

In botany, a bract is a modified or specialized leaf, especially one associated with a reproductive structure such as a flower, inflorescence axis, or cone scale. Bracts are often different from foliage leaves. They may be smaller, larger, or of a different color, shape, or texture...

(modified leaf) extending to 30–45 cm height before it bends down to the ground. It produces a large number of offshoots from the mother bulb on the yearly basis. The offshoots inhibit the growth and thus are often removed. The plant is known for its early dormancy. The plant's seeds are poisonous if ingested.