Poison suckleya-Suckleya suckleyana (Torr.) Rydb.-Poisonous plant

Poison suckleya

General poisoning notes:

Poison suckleya (Suckleya suckleyana) is a native herb found in the southern Saskatchewan and southern Alberta. This plant has caused losses of cattle and possibly sheep in the western United States. The plant is not normally ingested, but in times of scarce forage, it may be eaten in sufficient amounts to cause death. It contains an unknown cyanogenic glycoside that upon ingestion of sufficient quantity can release cyanide in the animal system, resulting in cytotoxic hypoxia. Experiments with cattle, sheep, laboratory rabbits, and guinea pigs have shown the cyanogenic potential of poison suckleya. This plant is not usually ingested by animals and is not common in the southern prairies. However, poisoning can occur (Thorp and Deem 1938, Berry and Gonzales 1986).

Nomenclature:

Scientific Name: Suckleya suckleyana (Torr.) Rydb.

Vernacular name(s): poison suckleya

Scientific family name: Chenopodiaceae

Vernacular family name: goosefoot

Geographic Information

Alberta, British Columbia.

Toxic parts:

Leaves, stems.

Notes on Toxic plant chemicals:

An unknown cyanogenic glycoside is found in poison suckleya. Upon ingestion, cyanide is released in the animal''s system. The cyanide potential of this plant was measured at 0.01-0.24%. After fasting, sheep showed transitory symptoms, with forced feedings of large amounts of the plant containing 0.011% cyanide potential. Plant material measured at 0.0364% cyanide potential is lethal to cattle, guinea pigs, and sheep (Thorp and Deem 1938).

Toxic plant chemicals:

Unknown chemical.

Animals/Human Poisoning:

Note: When an animal is listed without additional information, the literature (as of 1993) contained no detailed explanation.

Cattle

General symptoms of poisoning:

breathing, labored

cyanosis

death by asphyxiation

gait, staggering

muscle twitching

Notes on poisoning:

Ingesting abundant plant material causes cyanide to be released into cattle. Symptoms include glassy eyes, muscular twitching, dribbling urine, staggering, cyanosis, fast and weak heart, labored breathing, spasms, and death by asphyxiation. Postmortem findings showed black-colored blood, congestion of the mucous membrane on the folds of the abomasum and initial part of the duodenum, and a distended bladder. Treatment includes intravenous sodium nitrate and sodium thiosulfate, with a laxative to remove plant material from the rumen (Thorpe and Deem 1938, Berry and Gonzales 1986).

Sheep

General symptoms of poisoning:

collapse

death by asphyxiation

dyspnea

heart rate, slow

salivation.

Notes on poisoning:

On the rangelands of the western United States, sheep were believed to have died as a result of ingesting poison suckleya. Sheep were experimentally poisoned after they were force-fed plant material. Sickness and death resulted. Symptoms were similar to those of cattle that died from cytotoxic hypoxia (Thorpe and Deem 1938).