bindi weed seed

Bindii dermatitis most often occurs in late spring and early summer and is less frequent during winter when the bindii weed becomes dormant.

Bindii dermatitis is a form of irritant contact dermatitis resulting from injury by the seed of the bindii weed.

The severity of the dermatitis depends on:

The bindii weed originated in South America, and has since spread to Australia, New Zealand, Portugal, Spain, and the southern United States.

Bindii is the Australian name for a prickly annual weed. It is a low-growing plant that is widely established in lawns and flower beds. The name is used to refer to several species, particularly Soliva pterosperma and Soliva sessilis . Other names for bindii are bindi, bindyi, Jo-Jo, bindi-eye, and, in New Zealand, Onehunga weed, prickle weed, and burrweed.

Who gets bindii dermatitis?

The risk of dermatitis may be increased if there is a family history of bindii dermatitis.

Authors: Jason Tang, Medical Student, University of New South Wales, NSW, Australia; Dr Monisha Gupta, Dermatologist, Liverpool Hospital, and Senior Conjoint Lecturer, University of New South Wales, NSW, Australia. DermNet New Zealand Editor in Chief: Adjunct A/Prof Amanda Oakley, Dermatologist, Hamilton, New Zealand. Copy edited by Gus Mitchell. November 2017.

The histology of a skin biopsy of bindii dermatitis shows spongiosis , mixed dermal infiltrate , and foreign-body giant cells . There may be marked oedema of the papillary dermis and draining sinuses . Evidence of plant material may also be present.

Bindii dermatitis is a clinical diagnosis made through taking a thorough medical history and examination of the patient. There are no specific tests.

Visible bindii seeds or ‘prickles’ should be manually removed.

Some patients may develop an immediate weal reaction when pricked by the bindii weed; this can resolve without progressing to dermatitis.

The spine of the bindii seed penetrates the skin causing a sharp prick. Over the next few days, the skin around the spine becomes inflamed, forming discrete red papules with a central puncture site.

Soliva sessilis plant.

Bindii dermatitis may affect anyone. However, it most often affects boys 5–18 years of age, possibly because of their active lifestyles involving outdoor sports.

Soliva sessilis plant 1.

Bindii dermatitis does not always respond to topical or systemic corticosteroids . Luckily, it is self-limited.

What are the clinical features of bindii dermatitis?

Bindii is a small rosette-forming weed with stolons that are capable of creating additional rosettes and can form a mat-like coverage. It is also commonly known as Jo-Jo weed.

When does Bindi occur? It is a significant winter and early spring weed of all turf areas in Australia.

Bindi – What is it? An annual weed, native to South America, it is prevalent in all states of Australia.

The seed pods are produced at the base of the plant and often inconspicuous, which makes them difficult to spot.

What damage or effect will Bindi have? Fast growing and invasive, it is common on all types of growing areas including lawns, gardens and turf.

The seeds which are protected by a spiny capsule characterise this weed. They harden off and turn from being spiny to being spikey which, when walked over barefoot, are very painful and put a prickle in the skin.

Bindii – also called Jo-Jo Weed or Onehunga – is a low-growing, spreading, annual weed. Fern-like leaves (similar to carrot leaves) are attached to stems which grow from the centre in a rosette form. Plants generally grow 4 cm in diameter and are covered in fine hairs.

Flowers are very small (3mm) and greenish-yellow. Flowers are produced in Autumn and Winter and mature into seeds in Spring and Summer. Seeds are light-brown, flattened and winged seeds with one especially long spine on the end – capable of piercing the skin. Seeds drop from the plant in mid-summer and are further spread by foot traffic or on the fur of animals.