''Eryngium yuccifolium'', known as rattlesnake master, button eryngo, and button snake-root, is a

perennial A perennial plant or simply perennial is a plant that lives more than two years. The term ('' per-'' + '' -ennial'', "through the years") is often used to differentiate a plant from shorter-lived annuals and biennials. The term is also wide ...

herb of the parsley family native to the

tallgrass prairie The tallgrass prairie is an ecosystem native to central North America. Historically, natural and anthropogenic fire, as well as grazing by large mammals (primarily bison) provided periodic disturbances to these ecosystems, limiting the encroachm ...

s of central and eastern North America. It grows from

Minnesota Minnesota () is a state in the upper midwestern region of the United States. It is the 12th largest U.S. state in area and the List of U.S. states and territories by population, 22nd most populous, with over 5.75 million residents. Minne ...

east to

Ohio Ohio () is a U.S. state, state in the Midwestern United States, Midwestern region of the United States. Of the List of states and territories of the United States, fifty U.S. states, it is the List of U.S. states and territories by area, 34th-l ...

and south to

Texas Texas (, ; Spanish language, Spanish: ''Texas'', ''Tejas'') is a state in the South Central United States, South Central region of the United States. At 268,596 square miles (695,662 km2), and with more than 29.1 million residents in 2 ...

and

Florida Florida is a state located in the Southeastern region of the United States. Florida is bordered to the west by the Gulf of Mexico, to the northwest by Alabama, to the north by Georgia, to the east by the Bahamas and Atlantic Ocean, a ...

, including a few spots in Connecticut, New Jersey, Maryland, and Delaware.

Name

The common name "rattlesnake master" is attributed to early European pioneers erroneously believing the plant to be an

antidote An antidote is a substance that can counteract a form of poisoning. The term ultimately derives from the Greek term φάρμακον ἀντίδοτον ''(pharmakon) antidoton'', "(medicine) given as a remedy". Antidotes for anticoagulants are s ...

for

rattlesnake Rattlesnakes are venomous snakes that form the genera '' Crotalus'' and '' Sistrurus'' of the subfamily Crotalinae (the pit vipers). All rattlesnakes are vipers. Rattlesnakes are predators that live in a wide array of habitats, hunting small ...

venom Venom or zootoxin is a type of toxin produced by an animal that is actively delivered through a wound by means of a bite, sting, or similar action. The toxin is delivered through a specially evolved ''venom apparatus'', such as fangs or a ...

based upon Native Americans' various medicinal uses of the plant. The species name ''yuccifolium'' "yucca-leaved" was given because its leaves resemble those of

yucca ''Yucca'' is a genus of perennial shrubs and trees in the family Asparagaceae, subfamily Agavoideae. Its 40–50 species are notable for their rosettes of evergreen, tough, sword-shaped leaves and large terminal panicles of white or whitish ...

Description

The leaves are stiff, long and narrow with a sharp tip, long but only broad. They are bluish-green, and covered in a waxy coating. On the edges are regularly spaced bristles or spines. The

root In vascular plants, the roots are the organs of a plant that are modified to provide anchorage for the plant and take in water and nutrients into the plant body, which allows plants to grow taller and faster. They are most often below the sur ...

system consists of a central

taproot A taproot is a large, central, and dominant root from which other roots sprout laterally. Typically a taproot is somewhat straight and very thick, is tapering in shape, and grows directly downward. In some plants, such as the carrot, the taproo ...

surrounded by thick fleshy fibrous roots. It grows up to tall, with 10–40 dense, ball-shaped

umbel In botany, an umbel is an inflorescence that consists of a number of short flower stalks (called pedicels) that spread from a common point, somewhat like umbrella ribs. The word was coined in botanical usage in the 1590s, from Latin ''umbella'' " ...

s of flowers produced at the top of each stem. Each of these condensed umbels is in diameter, resembling flowerheads. Individual flowers in the umbels are small, 3–4 mm in diameter, with greenish-white or bluish-white petals and a faint honey-like scent. Underneath each flower is a spiny green bract, and underneath each flower cluster is a small star-like rosette of spiny bracts. The flowers are produced in July and August. After the flowerbuds open, the pollen matures and is released two to three days before the stigmas become receptive. This encourages

cross-pollination Pollination is the transfer of pollen from an anther of a plant to the stigma of a plant, later enabling fertilisation and the production of seeds, most often by an animal or by wind. Pollinating agents can be animals such as insects, birds, ...

by making it unlikely that a given flower's pollen will fertilize the stigma of the same flower. Rattlesnake master has unusually high seed set (close to 90%).

Ecology

remnant natural area A remnant natural area, also known as remnant habitat, is an ecological community containing native flora and fauna that has not been significantly disturbed by destructive activities such as agriculture, logging, pollution, development, fire ...

s, ''Eryngium yuccifolium'' is fairly intolerant of anthropogenic disturbance. It readily establishes when planted in prairie restorations. The flowers attract many insects, including short and long-tongued bees, flies, beetles, and butterflies, but most numerous of all are wasps. It is a larval host to the rattlesnake-master borer moth (''Papaipema eryngii'').

Cultivation

It is sold by native plant nurseries for prairie or native meadow restoration and for gardens and landscapes. It does best with full sun and well-drained soil. Slightly acidic to slightly alkaline soil reaction (pH) is best. It can die from root rot if the soil stays wet or moist for too long. Once planted it is best left undisturbed and never dug up and reset as with many perennials because it develops a large taproot and other thick, fleshy roots. It often self-sows a little to a good amount in gardens. When planted from seed, a period of cold-moist stratification is required.

Uses

Fibers of rattlesnake master have been found as one of the primary materials used in the ancient shoe construction of midwestern Native Americans. A study in 2016 found that extracts of Eryngium yuccifolium had some inhibitory effect on enzymes found in the venom of 5 North American venomous snake species, suggesting that the attribution of medicinal properties for treating snakebite may have been more than colloquial.

References

{{Taxonbar, from=Q3299859 yuccifolium Endemic flora of the United States Taxa named by André Michaux Flora without expected TNC conservation status