purple rattlesnake root
(Nabalus racemosus)
Conservation • Wetland • Description • Habitat • Ecology • Use • Distribution • Taxonomy
Conservation Status |
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| IUCN Red List | not listed |
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| NatureServe | NNR - Unranked SNR - Unranked |
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| Minnesota | not listed |
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Wetland Indicator Status |
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| Great Plains | FACU - Facultative upland |
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| Midwest | FACW - Facultative wetland |
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| Northcentral & Northeast | FACW - Facultative wetland |
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Description |
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The stem is covered with a whitish, waxy bloom (glaucous). It is hairless below the inflorescence. The basal leaves are present at flowering. The underside of the leaves below the inflorescence is hairless. The involucre has 7 to 14 hairy inner bracts. The flower head has 9 to 29 ray florets. The ray florets are usually pink to lavender, sometimes white with a purplish-tinged base. |
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Height |
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14″ to 67″ |
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Flower Color |
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Pink to lavender or white |
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Similar Species |
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Rough rattlesnake root (Nabalus asper) stem is hairy above the midpoint and is not glaucous). The flowers are cream-colored to pale yellow. White rattlesnake root (Nabalus albus) involucre bracts are hairless. |
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Habitat |
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Moist. Prairies, meadows, streambanks. |
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Ecology |
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Flowering |
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August to October |
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Use |
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Distribution |
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Sources |
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| 6/2/2023 | ||||
Nativity |
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Native |
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Occurrence |
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Taxonomy |
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| Kingdom | Plantae (green algae and land plants) | ||
| Subkingdom | Viridiplantae (green plants) | ||
| Infrakingdom | Streptophyta (land plants and green algae) | ||
| Superdivision | Embryophyta (land plants) | ||
| Division | Tracheophyta (vascular plants) | ||
| Subdivision | Spermatophytina (seed plants) | ||
| Class | Magnoliopsida (flowering plants) | ||
| Superorder | Asteranae | ||
Order |
Asterales (sunflowers, bellflowers, fanflowers, and allies) | ||
Family |
Asteraceae (sunflowers, daisies, asters, and allies) | ||
| Subfamily | Cichorioideae (chicories, dandelions, and allies) | ||
| Tribe | Cichorieae (lettuce, chicory, dandelion, and salsify) | ||
| Subtribe | Crepidinae (dandelions, hawksbeards, and rattlesnake roots) | ||
| Genus | Nabalus (rattlesnake roots) | ||
This species was formerly classified as Prenanthes racemosa. In 2010, based on their close relationship with lettuce (Lactuca sativa), 24 species in the genus Prenanthes were moved to the genus Nabalus. |
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Subordinate Taxa |
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Synonyms |
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Prenanthes racemosa Prenanthes racemosa ssp. multiflora Prenanthes racemosa var. multiflora Prenanthes racemosa var. pinnatifida Prenanthes racemosa var. racemosa Prenanthes racemosa ssp. racemosa Prenanthes racemosa ssp. racemosa var. pinnatifida Prenanthes racemosa ssp. racemosa var. racemosa |
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Common Names |
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glaucous rattlesnake root glaucous white-lettuce purple rattlesnake root purple rattlesnake-root purple rattlesnakeroot smooth rattlesnake root smooth rattlesnakeroot |
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Glossary
Bract
Modified leaf at the base of a flower stalk, flower cluster, or inflorescence.
Glaucous
Pale green or bluish gray due to a whitish, powdery or waxy film, as on a plum or a grape.
Involucre
A whorl of bracts beneath or surrounding a flower or flower cluster.
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Plant |
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Inflorescence |
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Flower |
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Leaves |
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Stem |
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Slideshows |
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