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| Prenanthes alba L. | Species Image Gallery (opens in a new window) |
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| TAXONOMY | |||||||||||||||
| Family: | Asteraceae or Compositae | ||||||||||||||
| Genus: | Prenanthes | ||||||||||||||
| Species Synonyms: | Nabalus albus (L.) Hook. | ||||||||||||||
| Common Names: | white lettuce white rattlesnakeroot |
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| DISTRIBUTION | |||||||||||||||
| Canada: | east-central – southeastern Saskatchewan – southwestern Quebec | ||||||||||||||
| Saskatchewan: | east-central – southeastern Saskatchewan; Bainbridge – Armit –Porcupine Hills – Qu’Appelle River Valley, Moose Mountain | ||||||||||||||
| Ecoregion: | Aspen Parkland, Boreal Transition, Mid-Boreal Upland, Mid-Boreal Lowland | ||||||||||||||
| HABITAT | |||||||||||||||
| Saskatchewan: | semi-shaded deciduous or mixed woods and clearings | ||||||||||||||
| Associated Species: | Aralia nudicaulis, Mertensia paniculata, Solidago canadensis | ||||||||||||||
| RARITY STATUS | |||||||||||||||
| Provincial
Status According to Harms (2003): |
Vulnerable |
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| Nature Conservancy Status: | G5 S2 |
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| Saskatchewan
Species at Risk Status: |
None |
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| COSEWIC Status: | None |
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| Prenanthes alba is vulnerable because it is almost always locally sparse. No immediate threats are known but are quite possible in the future. | |||||||||||||||
| SPECIES DESCRIPTION | |||||||||||||||
| Height: | 50 – 150 cm | ||||||||||||||
| Stems: | solitary, often purplish, glabrous | ||||||||||||||
| Leaves: | basal and cauline; basal leaves long-petiolate, petiole 2 – 3 times longer than blade, ternately lobed, margin coarsely toothed; cauline leaves short-petiolate to sessile, reduced upwards, lobed to toothed | ||||||||||||||
| Inflorescence: | phyllaries in 3 series; the outer 2 very short; inner (principle) series 8, 11 – 14 mm long, purplish, glabrous or nearly so, may be covered in waxy bloom | ||||||||||||||
| Flowers: | ligulate florets only, 9, fertile, white to pink to lavender | ||||||||||||||
| Fruits: | achene 4 – 6 mm long, bright yellow, distinctly ribbed; pappus dark brown to reddish, capillary bristles | ||||||||||||||
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