Toxicoscordion venenosum
Toxicoscordion venenosum | |
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Toxicoscordion venenosum flowering Black Hills, South Dakota | |
Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Monocots |
Order: | Liliales |
Family: | Melanthiaceae |
Genus: | Toxicoscordion |
Species: | T. venenosum
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Binomial name | |
Toxicoscordion venenosum (
Rydb. (1903) | |
Varieties[2] | |
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Synonyms[2][3][4] | |
List
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Toxicoscordion venenosum, with the common names death camas and meadow death camas, is a species of flowering plant in the genus
Description
Toxicoscordion venenosum is bulb plant that is 20–70 centimeters tall when flowering in the spring or early summer. The underground bulbs are egg shaped (ovoid) and made of up of multiple layers protected by dried outer layers (tunicate).[5]
The plant's leaves appears very early in the spring and are narrow.
Flowering
The inflorescence usually does not have branches and is a raceme, but will sometimes have one or two branches near the base and be a panicle.[7] If a plant does have branches they will one tenth to one third the length of the stem. It may be as much as 20 centimeters long, but may also be as short as 2 centimeters. There may be ten to fifty flowers on the flowering stem. The top of the flowering stem will be pyramidal in shape when blooming begins with smaller buds and immature flowers towards the top and open flowers towards the base.[5]
The flowers are off white and resemble six pointed stars.[10] The petals and sepals are very similar to each other and so are often called tepals.[7] Together they are called a perianth and are 5–10 millimeters in diameter.[5] The outer three tepals are egg shaped (ovate) and strongly curved inward while the inner three are shaped more like a spear head (lanceolate) and are more yellow or yellowish-green than the outer three. Each flower has six stamens each as long or slightly longer than the tepals.[7] The bracts on the back of the flowers may be green or white and are 5–25 millimeters long.[5] Flowering may comence in April, May, June, or as late as July in its native habitat.[11][12]
The fruit is a capsule 8–20 millimeters long and 4–7 millimeters wide.[5] The tepals persist into fruiting.[7] The seeds are 5–6 millimeters long and light brown in color.[9]
The closely related foothills death camas (Toxicoscordion paniculatum) has a very similar appearance, but with smaller flowers, more open clusters, and multiple flowers on each stemlet (a panicle).[13]
The normal
Taxonomy
Toxicoscordion venenosum was given its first scientific name, Zigadenus venenosus, and described by Sereno Watson in 1879.[2][15] The botanist Per Axel Rydberg proposed the new genus Toxicoscordion in 1903 and placed the species there.[2] Most sources in the 20th century continued to classify it in Zigadenus, however genetic research published in 2002 resurrected the genus Toxicoscordion.[16]
As of 2024[update] this is the accepted name according to Plants of the World Online and World Flora Online.[2][17] However, many sources such as the Flora of North America still list it as Zigadenus venenosus.[5]
Varieties
Two varieties of this species are accepted.[2]
Toxicoscordion venenosum var. gramineum
This variety was first described by Per Axel Rydberg as a species named Zigadenus gramineus in 1900.[3] However, it was generally recognized as a separate species until the 21st century.[18] This variety is differentiated by more often having branches on it flowering stems and the outer tepals being less curved (clawed) than in var. venenosum. It is found in the Pacific Northwest, Colorado, Canada, and the northern plains, much more widely spread than the other variety.[11]
Toxicoscordion venenosum var. venenosum
The autonymic variety almost never has branches on its flowering stem, at most having just one branch. The outer tepals of the flowers are clawed and 5 millimeters long.[12] It it found on the west coast of North America from British Columbia to Baja California in Mexico.[19][4] It is not found further east than Nevada, Idaho, or Utah.[12]
Names
The genus name Toxicoscordion is derived from Greek and means "poison garlic". The species portion of its binomial name, venenosum, appropriately translates as "very poisonous".[8] In English it is often simply called "death camas",[20] a name also applied to other species in the genus.[21] More specifically it is known as "meadow death-camas" to distinguish it from other related plants.[22] The variety gramineum is sometimes called "grassy deathcamas".[23] The "camas" part of its name is due the resemblance of the bulbs to those of the edible Camassia flowers.[24] Other common names include "poison onion" and "poison camas".[25]
In the
Toxicity
Toxicoscordion venenosum has a well deserved poisonous reputation.
Human poisonings are rare. Symptoms of poisoning are numerous. The first symptom is watering of the mouth followed by numbness of the lips and mouth. Other possible gastric symptoms include thirst, nausea, stomach pain, vomiting, and diarrhea. Circulatory, nervous, and muscular symptoms may include a headache, muscular weakness, confusion, slow and/or irregular heartbeat, low blood pressure, below normal temperature, difficulty breathing, convulsions, or coma. In severe cases coma is followed by death. The onset of symptoms ranges from one to eight hours after consumption. A number of edible bulb species have been mistaken for meadow death camas including blue camas, wild
The plant is also deadly to livestock, with sheep being most commonly poisoned.[30] However, pigs are reported to vomit the plant and avoid being fatally poisoned.[34] The lethal dose of green plant material is between 0.6% and 6.0% of an animal's body weight.[35] In experiments with sheep it was amoung the most poisonous of member of its genus with just 0.4% of green material by body weight causing symptoms, close to the 0.2% of Toxicoscordion nuttallii. And material from T. venenosum var. gramineum was almost as equally fatal at just 0.6% compaired with 0.5% for T. nuttallii.[36] As a plant develops towards flowering the levels of zygacine decrease in the plant. The plants tend to have higher levels of poison in dry locations and in years with less rainfall.[30]
Range and habitat
Meadow deathcamas is found through much of western North America. In Canada it is found in three western provinces Alberta, British Columbia, and Saskatchewan. In the United States it grows from the West Coast to Rocky Mountains with the exception of the state of Arizona. This includes California, Colorado, Idaho, Montana, Nebraska, Nevada, New Mexico, North Dakota, Oregon, South Dakota, Utah, Washington, and Wyoming.[2] It also grows in the Mexican state of Baja California.[19]
The meadow deathcamas grows in more open, sunny habitats. The variety venenosum grows in grasslands and open pine woodlands of the interior from 500 to 1300 meters.
Ecology
The nectar is also poisonous and controlled experiments have shown that honeybees can be fatally poisoned by the flowers and it or its relative are suspected in a few cases of honeybee poisonings.
Though the death camas bee is the only bee that feeds upon death camas flowers, a fly species, Earomyia melnickae, was described in 2022 which was discovered feeding on the meadow death camas flowers. As of 2024[update] it is unknown where or what the species may feed upon as a larvae. Extensive searches were made on the bulbs in the area where the flies were discovered, but no signs of feeding or larvae were discovered. It is also unknown if they contribute to pollination of the flowers to any degree.[40]
As a bulb plant, it survives fires easily. Though plants that are actively growing will be consumed in a fire the bulb will survive and regenerate. When dormant the bulbs are apparently entirely unaffected by fires. They grow in a variety of habitats with different fire intervals, from as infrequent as more than 400 years between fires to as frequent as yearly fires in some ponderosa pine forests.[31]
Conservation
When evaluated by NatureServe in 2015 it was found to be "Secure" at the global level (G5). They also found it to be secure in British Columbia, Montana, and Wyoming (S5) and "Apparently Secure" (S4) in the provinces of Alberta and Saskatchewan.[1]
Cultivation
The naturalist Ira Noel Gabrielson dismissed it and all of its relatives except for Toxicoscordion fremontii as not having, "charm enough to take up room in a garden when so many more beautiful things are available."[41] Despite this, very rarely, this species is grown in gardens. Though due to the toxic nature of it and all its relatives caution is urged to avoid planting it where herbivores would have access. In the Manual of Bulbs from the Royal Horticultural Society it is listed as tolerating winter temperatures at least as cold as −15 °C (5 °F).[42]
References
- ^ a b NatureServe (2024). "Zigadenus venenosus". Arlington, Virginia. Retrieved 15 February 2024.
- ^ a b c d e f g "Toxicoscordion venenosum (S.Watson) Rydb". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 15 February 2024.
- ^ a b "Toxicoscordion venenosum var. gramineum (Rydb.) Brasher". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 6 April 2024.
- ^ a b "Toxicoscordion venenosum var. venenosum". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 13 April 2024.
- ^ a b c d e f g Schwartz, Fayla C. "Zigadenus venenosus - FNA". Flora of North America. Retrieved 15 February 2024.
- ISBN 978-0-88192-745-0. Retrieved 5 April 2024.
- ^ a b c d e f Heil, Kenneth D.; O’Kane, Jr., Steve L.; Reeves, Linda Mary; Clifford, Arnold (2013). Flora of the Four Corners Region : Vascular Plants of the San Juan River Drainage, Arizona, Colorado, New Mexico, and Utah. St. Louis, Missouri: Missouri Botanical Garden. pp. 633–635. Retrieved 6 April 2024.
- ^ ISBN 978-0-7627-8034-1. Retrieved 15 February 2024.
- ^ a b c Hitchcock, Charles Leo; Cronquist, Arthur; Ownbey, Marion; Thompson, J.W. (1955). Vascular Plants of the Pacific Northwest. Vol. Part 1: Vascular Cryptogams, Gymnosperms, and Monocotyledons. Seattle, Washington: University of Washington Press. p. 815. Retrieved 13 April 2024.
- ISBN 978-0-520-02742-8. Retrieved 4 April 2024.
- ^ a b c Schwartz, Fayla C. (5 November 2020). "Zigadenus venenosus var. gramineus - FNA". Flora of North America. Retrieved 6 April 2024.
- ^ a b c d Schwartz, Fayla C. (5 November 2020). "Toxicoscordion venenosum var. venenosum - FNA". Flora of North America. Retrieved 13 April 2024.
- ISBN 978-0-615-58854-4. Retrieved 16 February 2024.
- ^ McNeal, Dale W.; Zomlefer, Wendy B. (2012). "Toxicoscordion venenosum var. venenosum". Jepson eFlora. The Jepson Herbarium, University of California, Berkeley. Retrieved 14 April 2024.
- ^ Watson, Sereno (1879). "Contributions to American Botany". Proceedings of the American Academy of Arts and Sciences. 14: 279. Retrieved 16 April 2024.
- ISSN 1055-3177. Retrieved 16 April 2024.
- ^ "Toxicoscordion venenosum (S.Watson) Rydb". World Flora Online. Retrieved 15 February 2024.
- ISSN 1055-3177. Retrieved 16 April 2024.
- ^ a b Hassler, Michael (1 April 2024). "Synonymic Checklist and Distribution of the World Flora. Version 19.2". World Plants. Retrieved 13 April 2024.
- ^ ISBN 978-1-60469-635-6. Retrieved 15 February 2024.
- ISBN 978-0-9763091-3-0. Retrieved 15 February 2024.
- ISBN 978-0-943972-13-8. Retrieved 15 February 2024.
- ISBN 978-0-912410-04-3. Retrieved 20 April 2024.
- ISBN 978-0-88839-171-1. Retrieved 20 April 2024.
- ^ ISBN 978-0-19-540437-1. Retrieved 4 April 2024.
- ^ Welch, James R. (2013). Sprouting Valley: Historical Ethnobotany of the Northern Pomo from Potter Valley, California. Denton, Texas: Society of Ethnobiology. p. 112. Retrieved 16 February 2024.
- ^ "alapíšaš". Umatilla Language Online Dictionary. Confederated Tribes of the Umatilla Indian Reservation. Archived from the original on 1 December 2021. Retrieved 13 April 2024.
- ^ "nupqasaquǂ". FirstVoices.com. Retrieved 13 April 2024.
- ISBN 978-0-295-95268-0. Retrieved 20 April 2024.
- ^ hdl:10150/644021. Retrieved 14 April 2024.
- ^ a b Hauser, A. Scott. "Zigadenus venenosus". Fire Effects Information System (FEIS). U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory. Retrieved 23 April 2024.
- ^ .
- ISBN 978-0-88192-179-3. Retrieved 20 April 2024.
- ^ "Zigadenus venenosus". Canadian Poisonous Plants Information System. Archived from the original on 2 April 2012. Retrieved 2 April 2012.
- ^ "Meadow Death-camas". Montana Plant Life. Archived from the original on 27 April 2015. Retrieved 12 June 2011.
- ^ Kingsbury, John Merriam (1964). Poisonous Plants of the United States and Canada. Englewood Cliffs, New Jersey: Prentice-Hall Inc. pp. 464–466. Retrieved 20 April 2024.
- ISBN 978-0-87842-280-7. Retrieved 13 April 2024.
- ISBN 9780691160771.
- .
- .
- ^ Gabrielson, Ira Noel (1932). Western American Alpines. New York: The Macmillan company. p. 261. Retrieved 27 April 2024.
- ISBN 978-0-88192-339-1. Retrieved 21 April 2024.
External links
- Calflora Database: Toxicoscordion venenosum (Meadow deathcamas)
- iNaturalist - Meadow Deathcamas Toxicoscordion venenosum
- Jepson Manual eFlora (TJM2) treatment of Toxicoscordion venenosum var. venenosum
- USDA Plants Profile for Zigadenus venenosus (meadow deathcamas)
- Lady Bird Johnson Wild Flower Center: Zigadenus venenosus (Meadow death camas, death camas)
- Turner Photographics, Wildflowers of the Pacific Northwest: Zigadenus venenosus (Meadow death camas)
- UC Photos gallery — Toxicoscordion venenosum