| Section 6 » Family Asteraceae |
Show/Hide Synonym
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| Nabalus albus | = | Prenanthes alba | Gleason and Cronquist (1991) | | | Nabalus albus | = | Prenanthes alba | Fernald (1950) | | | Nabalus albus | = | Prenanthes alba | Flora of North America (1993b, 1997, 2000, 2002a, 2002b, 2003a, 2004b, 2005, 2006a, 2006b, 2006c, 2007a, 2009, 2010) | | | Nabalus albus | = | Prenanthes alba | Gleason (1952) | | | Nabalus albus | = | Prenanthes alba | Kartesz (1999) | | | Nabalus albus | = | Prenanthes alba | | | | Nabalus albus | = | Prenanthes alba | Vascular Flora of the Southeastern States (Cronquist 1980, Isely 1990) | | | Nabalus albus | = | Prenanthes alba | Wofford (1989) | | | Nabalus albus | = | Prenanthes alba | Lack in Kadereit & Jeffrey (2007). Key adapted from C and SE, in part. | | | Nabalus albus | = | Prenanthes alba ssp. alba | Radford, Ahles, and Bell (1968) | | | Source: Weakley's Flora |
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| Author | (L.) Hooker | |
| Distribution | North American species formerly in the genus Prenanthes have now been assigned to the genus Nabalus. Weakley (2018) indicates that records of the old "Prenanthes alba" in the NC Coastal Plain are now assignable to Nabalus trifoliatus; they were formerly named as the subspecies pallida (i.e., named as Prenanthes alba ssp. pallida in RAB [1968]). Therefore, it is the former Prenanthes alba ssp. alba that is now Nabalus albus, as shown on the range map below.
ME to Man., south to NC, WV, MO, and AR. | |
| Abundance | Apparently rare, with specimens known from 7 counties, and reports from 4 others. This is a State Special Concern species. The NCNHP's State Rank of S2? might be correct, but the available data suggest a rank of S1S2 is more appropriate. However, because of some taxonomic uncertainties, biologists do not seem to have a good handle on its abundance and distribution. | |
| Habitat | Montane forests and woodlands, especially in high pH soils. |
| Phenology | Flowering and fruiting July-October. | |
| Identification | Rattlesnake-roots are characterized by nodding heads of ray florets only, alternate leaves that are roughly triangular and irregularly lobed and/or toothed, and milky juice. White Rattlesnake-root grows 2-5 feet tall and has cinnamon colored pappus (feathery hairs attached to seeds), and white to pale pink florets. | |
| Taxonomic Comments | Outer Coastal Plain plants, formerly Prenanthes alba ssp. pallida, have been re-examined and are now lumped within Nabalus trifoliatus.
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| Other Common Name(s) | Northern Rattlesnake-root, Boott's Rattlesnake-root, White Lettuce | |
| State Rank | S2? [S1S2] | |
| Global Rank | G5 | |
| State Status | SC-V | |
| US Status | | |
| USACE-agcp | FACU link |
| USACE-emp | FACU link |
