Arisaema flavum - (Forssk.)Schott.
(Forssk.)Schott.
gbif· cc-by-nc
Jonathan Newman
gbif· cc-by-nc
Jonathan Newman
gbif· cc-by
王天
Description
Arisaema flavum is a PERENNIAL growing to 0.4 m (1ft 4in). See above for USDA hardiness. It is hardy to UK zone 7. It is in flower from June to July, and the seeds ripen from June to July. The species is monoecious (individual flowers are either male or female, but both sexes can be found on the same plant) and is pollinated by Flies. The plant is not self-fertile. Suitable for: light (sandy) and medium (loamy) soils and prefers well-drained soil. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils. It can grow in full shade (deep woodland) semi-shade (light woodland) or no shade. It prefers moist soil and can tolerate drought.
Edible Uses
Young leaves - cooked and used as a vegetable. Some caution is advised, see the notes above on toxicity.
Medicinal Uses
Antispasmodic Epilepsy Expectorant. Expectorant. It is used in the treatment of chronic tracheitis, bronchiectasis, tetanus and epilepsy.
Known Hazards
The plant contains calcium oxylate crystals. These cause an extremely unpleasant sensation similar to needles being stuck into the mouth and tongue if they are eaten but they are easily neutralized by thoroughly drying or cooking the plant or by steeping it in water.
Distribution
E. Asia - Himalayas to China. N. Africa - Yemen.
Where It Grows
Coming Soon
Cultivation
Prefers a cool moist peaty soil in the bog, woodland garden or a sheltered border in semi-shade. Prefers a loamy or peaty soil and will tolerate a sunny position if the soil is moist but not water-logged and the position is not too exposed. This species is the most drought tolerant member of the genus. Plants are nearly hardy in Britain, they normally succeed outdoors in the milder areas of the country. Only plant out full sized tubers and mulch them with organic matter in the winter. Plants need protection from slugs. Most species in this genus are dioecious, but they are sometimes monoecious and can also change sex from year to year. The flowers of this species are usually either monoecious or all male.
Propagation
Seed - best sown as soon as it is ripe in a shady position in a cold frame. Stored seed remains viable for at least a year and can be sown in spring in the greenhouse but it will probably require a period of cold stratification. Germination usually takes place in 1 - 6 months at 15°c. When large enough to handle, prick the seedlings out into individual pots and grow them on in light shade in the greenhouse for at least a coupe of years until the corms are more than 20mm in diameter. Plant out into their permanent positions whilst they are dormant. Division of tubers when the plant dies down in late summer.
Other Uses
Insecticide. Used as a pesticide. No further details are given, but the report might be referring to the tubers.
