Is Palestine Arum Poisonous to Dogs, Cats, Horses, and Livestock?

Why This Page Should Be Called Palestine Arum

Palestine Arum is the clearest primary name for Arum palaestinum on this site. The old title, Wild Calla, is ambiguous and more commonly refers in northern botanical literature to Calla palustris. Wild Arum is also too broad because it can refer to multiple Arum species, including Cuckoo-Pint, Arum maculatum. Black Calla is useful but can be confused with dark ornamental Zantedeschia cultivars. Solomon’s Lily is useful regionally but can be confused with Solomon’s Seal.

Renaming the page to Palestine Arum preserves the species identity, matches the accepted scientific epithet, avoids a duplicate Wild Arum page, and still allows every older or ambiguous common name to remain in the AKA field and FAQ. This is the cleanest way to keep search coverage without making the page title fight other arum, calla, and lily pages.

Wild Calla, Black Calla, and Wild Arum Are Ambiguous Common Names

The name Wild Calla does not identify one plant reliably. In this entry it refers historically to Arum palaestinum, the dark-flowered Levantine aroid now better titled Palestine Arum. In northern European, Asian, Canadian, and American botanical literature, Wild Calla more commonly refers to Calla palustris. Gardeners may also use calla or calla lily for species and cultivars of Zantedeschia.

Wild Arum is also ambiguous. It may refer to Arum maculatum, Arum italicum, Arum palaestinum, or another species depending on region, trade source, and local tradition. Because all of these can share insoluble calcium oxalate raphide concerns, the first-aid response may overlap, but the page title should still identify the actual species whenever possible.

Palestine Arum Is the Same Species Formerly Listed Here as Wild Calla

Arum palaestinum is one accepted botanical species with several common names. Palestine Arum, Palestinian Arum, Black Calla, Wild Calla, Black Arum, Wild Arum, Solomon’s Lily, Priest’s Hood, and Witch’s Paintbrush may all refer to this same dark-flowered plant in different contexts.

The common names emphasize different features. “Black Calla” describes the nearly black-purple inflorescence, “Palestine Arum” reflects the plant’s Levantine regional identity, and “Wild Calla” compares its hooded spathe and spadix with plants sold or known as callas. For a PAWS title, Palestine Arum is the least ambiguous of the widely useful names.

Accepted Name and Correct Spelling

The accepted scientific name is Arum palaestinum Boiss. Pierre Edmond Boissier published the name in 1854. The form Arum palestinum omits the second “a” and is not the accepted botanical spelling.

Kew recognizes Arum magdalenae, Arum sanctum, and Richardia sancta as synonyms. These names may still appear in nursery records, herbarium specimens, historical horticultural literature, ethnobotanical material, and plant collections.

How to Distinguish It from Calla palustris

Calla palustris is the plant most consistently called Wild Calla in northern wetland floras. It is a small rhizomatous aquatic or semiaquatic perennial native across northern North America, Europe, and Asia. It grows in bogs, swamps, marshes, lake margins, shallow streams, and other saturated habitats.

Calla palustris has smooth, waxy, heart-shaped leaves and a conspicuous oval white spathe surrounding a short yellow-green spadix. Palestine Arum grows in the eastern Mediterranean and Levant rather than circumboreal wetlands. It has larger arrow-shaped leaves, a subterranean tuber, and a deep uniform purple interior to the spathe surrounding a black-purple spadix appendix.

Both plants contain irritating calcium oxalate crystals, so confusing them may not change the immediate response to mouth pain and drooling. Correct identification still matters for range, exposure source, plant removal, page targeting, and evaluation of unusual symptoms.

How to Distinguish It from Ornamental Calla Lilies

The familiar florist and garden calla lilies belong to Zantedeschia, a southern African genus. White calla lily is commonly Zantedeschia aethiopica, while yellow, pink, orange, burgundy, and nearly black ornamental callas may be other species or hybrids.

Zantedeschia plants usually have large arrow-shaped leaves and a showy funnel-like spathe surrounding a yellow or orange spadix. The darkest cultivars may be marketed as black callas, making that common name particularly unreliable.

Ornamental callas also contain insoluble calcium oxalate crystals and can cause immediate oral pain, drooling, vomiting, and difficulty swallowing. They are not botanically identical to Arum palaestinum even when flower color and common names overlap.

Palestine Arum Is Not a True Lily

Neither Arum palaestinum, Calla palustris, nor Zantedeschia is a true lily. True lilies belong to Lilium in Liliaceae. Daylilies belong to Hemerocallis.

This distinction is critical for cats. True lilies and daylilies can cause fatal acute kidney failure after very small exposures, including pollen and vase water. Palestine Arum causes immediate raphide injury and is not expected to produce the same feline renal syndrome. A plant label containing only the word “lily” is therefore inadequate during an emergency. The scientific name or a clear photograph of the entire plant is essential.

Native Range and Habitat

Palestine Arum is native from western Syria and Lebanon through Palestine and Jordan. It is a characteristic Levantine and eastern Mediterranean geophyte rather than a plant native throughout northern Europe or North America.

The species has been cultivated outside its natural range and has been recorded as introduced in California. Elsewhere it is most likely encountered as a specialty ornamental, botanic-garden plant, culturally significant food plant, or escaped garden specimen.

Palestine Arum grows on open hillsides, rocky ground, field margins, fallow fields, waste places, woodland openings, and cultivated or formerly cultivated land. It occurs on limestone-derived terra rossa, calcareous rock, alluvial soils, and soils formed from basalt and other regional substrates. These comparatively well-drained Mediterranean habitats differ sharply from the bogs and shallow water occupied by Calla palustris.

Seasonal Growth, Leaves, and Flowers

The plant is a tuberous geophyte. Leaves emerge during the cooler, wetter autumn and winter season, flowering generally occurs from March through May, and the aboveground growth disappears as the hot, dry summer approaches. The underground tuber remains alive during dormancy. A digging dog, pig, or other animal can therefore encounter toxic tissue when no leaves or flowers are visible.

The leaves arise on individual cylindrical stalks from the underground tuber. Mature blades are deep green, hairless, and sagittate to oblong-sagittate, giving them a broad arrowhead or trowel-like appearance. Leaf blades may reach approximately 15 to 36 centimeters long and 10 to 25 centimeters wide. The petiole may be stained purple along part of its length, especially near the base.

The structure commonly described as the flower consists of a fleshy spadix surrounded by a modified leaf called a spathe. The exterior of the spathe is greenish to pale brown, sometimes with purple staining. The inner spathe surface is a deep, relatively uniform purple. A black-purple cylindrical or slightly spindle-shaped appendix rises from the spadix, producing the nearly black appearance responsible for the name Black Calla.

The true flowers are tiny and located near the base of the spadix. Female flowers occupy a lower zone and male flowers an upper zone, with rings of sterile bristles participating in the plant’s temporary insect-trapping pollination system. The inflorescence may smell like fermenting apples or overripe fruit, and some plants produce weaker dung-like or carrion-like odors. The scent is a pollination mechanism and may attract curious animals.

Fruit, Seeds, and Tuber Exposure

After pollination, the spathe and leaves may disappear while a compact fruiting spike develops closer to the ground. The berries become yellow-green, orange, or red as they mature, depending on stage and observation. Colorful fruits may be more readily swallowed than the acrid leaves because an animal can gulp several before extensive chewing occurs. The seeds are confirmed to contain needle-shaped oxalate crystals.

Fallen berries should be collected promptly from animal areas. A fruiting spike should not be left where dogs, livestock, birds, rabbits, or children can investigate it. The underground tuber should also be treated as poisonous. It can remain after the visible plant disappears and may be exposed by digging, gardening, erosion, transplanting, or yard clearing.

The Araceae Family and Raphide Cells

Araceae contains thousands of species, including arums, callas, peace lilies, dumb canes, philodendrons, pothos, monsteras, elephant ears, anthuriums, and arrowhead vines. Many aroids use calcium oxalate crystals as a defense against herbivores. Their toxic syndromes overlap because chewing releases crystals directly into contacted tissues.

An idioblast is a specialized cell that differs from the tissue around it. Raphide idioblasts contain bundles of long calcium oxalate needles suspended within mucilage. Pressure, crushing, tearing, and the entry of saliva or sap into damaged cells can release or propel the crystal bundle outward. Not every idioblast behaves as an identical spring-loaded syringe, but the combined release from large numbers of cells creates an effective mechanical defense.

Raphides are rigid mineral structures. When released, their sharp ends penetrate moist mucous membranes far more readily than an intact smooth leaf surface would. One crystal creates a tiny wound. Thousands of crystals distributed across the lips, tongue, gums, and throat stimulate pain receptors simultaneously and allow sap to reach beneath the superficial protective layer. The response can be dramatic even when the actual amount swallowed is small.

Inflammation and Possible Proteinase Activity

Tissue damage triggers release of kinins, histamine, prostaglandins, and other inflammatory mediators. These compounds increase pain, blood flow, and leakage of fluid into the damaged tissue. The resulting edema may enlarge the lips and tongue and make swallowing painful. Swelling in the comparatively narrow pharyngeal or laryngeal space can have a greater effect on breathing than similar swelling on an exposed lip.

Direct crystal injury can produce marked inflammation without a classic allergy. An antihistamine cannot remove embedded raphides or secure an airway that is mechanically narrowing. Medication for swelling may be useful in selected veterinary cases, but airway protection comes first when breathing is compromised.

Proteolytic enzymes break proteins into smaller peptides or amino acids. In some aroids, proteinaceous irritants intensify the damage created by calcium oxalate crystals. The raphides may act as delivery structures by carrying sap into microscopic punctures. No specific proteinase has been established as the primary toxin of A. palaestinum, so the possibility remains scientifically reasonable but unconfirmed for this species.

Insoluble and Soluble Oxalates Produce Different Syndromes

Insoluble calcium oxalate raphides act mainly through direct tissue contact. The calcium and oxalate are already bound into crystals that do not dissolve readily in the digestive tract. Soluble oxalates can be absorbed, bind circulating calcium, cause hypocalcemia, disturb cardiac and muscular function, and contribute to calcium oxalate deposition within the kidneys.

Kidney failure should not be assigned automatically to Palestine Arum merely because the plant contains calcium oxalate. Abnormal kidney values after a severe exposure require investigation of dehydration, shock, hypoxia, another plant, medication, ethylene glycol, or underlying renal disease.

The 53-Patient Clinical Review

Saar Hashavya, Aus Maree, Itai Gross, Yaakov Asaf, and Yedidia Bentur reviewed pediatric Arum palaestinum exposures reported to the Israel National Poison Information Center during 2017. The 53 patients ranged from nine months to fifteen years of age, with a mean age of 3.3 years.

Thirty-four percent remained asymptomatic. Sixty-six percent developed minor effects, principally redness and irritation of the mouth, agitation, and drooling. No severe poisoning or upper-airway compromise occurred. The researchers concluded that the typical poisoning was self-limited and confined to contacted mucous membranes.

The patients were children rather than dogs, cats, horses, or livestock, so the study cannot define every veterinary outcome. It remains the strongest direct clinical series for this exact species and does not support presenting renal failure, coma, or permanent organ damage as the ordinary result.

Traditional Food Use Requires Careful Context

Palestine Arum leaves have a history of culinary use in parts of Palestine and the broader Levant. Preparation may involve repeated boiling, discarding water, combining the leaves with acidic ingredients, or using other culturally specific methods intended to reduce acridity.

Traditional processing demonstrates that preparation changes the plant; it does not make raw tissue safe. Incomplete preparation can leave enough irritating material to cause poisoning. No home-processing method or safe dose has been established for dogs, cats, horses, livestock, or other animals. Raw or prepared Palestine Arum should never be offered as animal food.

Dogs, Cats, Horses, and Livestock

Dogs may bite leaves, chew the dark inflorescence, swallow berries, or dig up the tuber. Short-nosed dogs and animals with existing airway disease may tolerate swelling poorly. Cats may nibble leaves, play with berries, or walk through sap during plant handling. Crystal-bearing residue on the paws or coat can be swallowed repeatedly during grooming.

Horses may encounter garden clippings, tubers disturbed during landscaping, or ornamental plants growing beside a paddock. They cannot vomit. Salivation, head tossing, mouth rubbing, feed refusal, coughing, repeated swallowing, nasal reflux, tongue swelling, diarrhea, and colic may occur.

Livestock generally stop eating after the first painful bite when adequate forage is available. Exposure becomes more likely when plants are mixed with cut vegetation, disposed of in an enclosure, or encountered during forage shortage. Possible signs include salivation, repeated mouth movements, feed refusal, tongue swelling, ruminal discomfort, diarrhea, and breathing difficulty. A group exposure should prompt immediate removal of all plant material and evaluation for other discarded ornamentals or chemicals.

Skin and Eye Exposure

Sap and crushed tissue may irritate the lips, muzzle, paws, eyelids, and damaged or sparsely haired skin. Burning, redness, itching, swelling, or dermatitis may develop. An animal can spread residue by licking or scratching. Gloves should be worn while handling damaged plants, and contaminated tools, clothing, bedding, and surfaces should be cleaned.

Calcium oxalate crystals entering the eye can abrade the corneal surface and cause severe pain, blinking, tearing, conjunctival swelling, and cloudiness. Rubbing may drive material deeper or create additional scratches. Prompt gentle irrigation is appropriate, followed by veterinary examination if discomfort or visible abnormalities persist.

Diagnosis and Differentials

Diagnosis usually rests on a credible exposure, immediate oral-pain syndrome, and accurate plant identification. Photographs should include the leaves, dark spathe and spadix, fruiting spike, tuber, and growing habitat. The veterinarian assesses the mouth, tongue, pharynx, larynx, breathing, swallowing, hydration, gastrointestinal signs, skin, and eyes.

The first botanical differentials are Calla palustris, ornamental Zantedeschia, Arum maculatum, Arum italicum, and other Arum species. All are aroids capable of causing oxalate irritation, but their habitat, morphology, and geographic origin differ. True lilies, lily of the valley, peace lilies, calla lilies, Solomon’s Seal, philodendrons, Dieffenbachia, elephant ears, and other plants containing “lily,” “arum,” or “calla” in their common names produce different or partially overlapping syndromes.

Caustic cleaners, batteries, electrical burns, insect stings, caterpillar hairs, bones, sticks, fishhooks, and esophageal foreign bodies can also cause sudden drooling, gagging, oral pain, and inability to swallow.

Veterinary Treatment, Prognosis, and Prevention

There is no specific antidote. Treatment focuses on removing remaining plant material, relieving pain, controlling vomiting, maintaining hydration, treating eye or skin injury, and protecting the airway. A veterinarian may gently cleanse the mouth, provide analgesia and an antiemetic, and administer fluids when vomiting or inability to drink causes dehydration. Medication for inflammation or hypersensitivity is selected according to the actual examination rather than given automatically.

Progressive tongue, pharyngeal, or laryngeal swelling may require oxygen, sedation, endotracheal intubation, or another emergency airway procedure. An animal with significant swelling should remain under observation until breathing and swallowing are clearly normal. Induced vomiting is inappropriate once oral pain, gagging, or dysphagia is present because crystals and sap will contact the mouth and esophagus again. Activated charcoal does not remove mineral needles embedded in tissue and is not routine treatment for uncomplicated Palestine Arum exposure.

The prognosis is excellent for most limited exposures. Immediate pain generally prevents prolonged consumption, and the strongest species-specific clinical evidence supports a mild, self-limiting syndrome. The outlook becomes more guarded with progressive airway swelling, aspiration, corneal ulceration, shock, persistent inability to swallow, or signs that suggest another toxin or complication.

Keep Palestine Arum outside pet runs, kennels, paddocks, and areas used by grazing animals. Remember that the underground tuber remains after visible foliage becomes dormant. Wear gloves while digging or dividing the plant. Collect every leaf, berry, seed cluster, tuber fragment, and piece of contaminated debris. Do not place plant trimmings in open compost or livestock areas. Label the plant with the accepted scientific name because Wild Calla, Black Calla, Wild Arum, and Solomon’s Lily are too ambiguous for dependable emergency identification.