Arisaema thunbergii subsp. urashima
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''Arisaema thunbergii'' subsp. ''urashima'' is a
herbaceous Herbaceous plants are vascular plant Vascular plants (from Latin ''vasculum'': duct), also known as Tracheophyta (the tracheophytes , from Greek τραχεῖα ἀρτηρία ''trācheia artēria'' 'windpipe' + φυτά ''phutá'' 'plants'), ...
perennial plant A perennial plant or simply perennial is a that lives more than two years. The term (' + ', "through the years") is often used to differentiate a plant from shorter-lived and . The term is also widely used to distinguish plants with little ...
. It is widespread through the woodlands of
Japan Japan ( ja, 日本, or , and formally ) is an in . It is situated in the northwest , and is bordered on the west by the , while extending from the in the north toward the and in the south. Japan is a part of the , and spans of coveri ...

Japan
, especially near the coast. The plant has a very curious
inflorescence An inflorescence is a group or cluster of s arranged on a that is composed of a main or a complicated arrangement of branches. , it is the modified part of the of where s are formed. The modifications can involve the length and the nature ...
, and is popular in horticulture. As with all arisaemas, the inflorescence consists of a
spathe ''). All the "leaves" in this image are bracts. In botany Botany, also called , plant biology or phytology, is the science Science (from the Latin word ''scientia'', meaning "knowledge") is a systematic enterprise that Scientific metho ...
tube enclosing a spadix appendix. In the case of ''A. thunbergi'' subsp. ''urashima'', the spadix appendix is elongated into a free hanging thread of 45 to 60 cm. The underground
tuber Tubers are enlarged structures used as storage organs for nutrients in some plants. They are used for the plant's perennation (survival of the winter or dry months), to provide energy and nutrients for regrowth during the next growing season, and ...
often produces offsets, which can be removed and grown on. The foliage dies down by summer, leaving the fruiting spike to ripen in autumn. The red berries contain high amounts of
oxalic acid Oxalic acid is an organic acid An organic acid is an organic compound with acidic properties. The most common organic acids are the carboxylic acids, whose acidity is associated with their carboxyl group –COOH. Sulfonic acids, contain ...

oxalic acid
, and can cause painful irritation to the skin. All parts of the plant should be considered poisonous.


References

Arisaema, thunbergii subsp. urashima Plant subspecies Endemic flora of Japan {{Araceae-stub