E-Flora BC: Electronic Atlas of the Flora of British Columbia

Prenanthes sagittata (A. Gray) A. Nelson
arrow-leaved rattlesnake-root (arrowleaf rattlesnakeroot)
Asteraceae (Aster family)

Introduction to Vascular Plants

© Ryan Batten  Email the photographer   (Photo ID #66715)

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Distribution of Prenanthes sagittata
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Species Information

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General:
Perennial herb from a slightly thickened taproot; stems erect, solitary, branched above, long-hairy, exuding milky juice when broken, 30-70 cm tall.
Leaves:
Basal leaves arrowhead-shaped, long-stalked, blades irregularly toothed, glabrous, 3.5-12 cm long, 0.5-11 cm wide; stem leaves similar below, middle and lower ones with winged stalks, becoming short-stalked or unstalked, reduced upwards.
Flowers:
Heads with strap-shaped flowers, numerous in a spikelike inflorescence; involucres 7-13 mm tall; involucral bracts lance-oblong, the principal ones linear, about 8, sparsely long-hairy; ray flowers white.
Fruits:
Achenes finely lined between the nerves, cylindric or tapering to the summit, glabrous, 4-6 mm long; pappus of brownish hairlike bristles.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist to mesic roadsides, forests and streambanks in the montane zone; rare in SE BC, known only from Kishinena Valley and Akamina Creek; E to AB and S to N ID and MT.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Prenanthes sagittata

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)
Site Information
 Value / Class

Minimum

Average

Maximum
Elevation (metres) 420 646 850
Slope Gradient (%) 0 7 15
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W] 		242 241 242
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric] 		5 5 5
Modal Nutrient Regime
Class		 D
Number of field plots
 species was recorded in:		 3
Modal BEC Zone Class
 SBS
All BEC Zones (# of stations/zone) species was recorded in: CWH(1), SBS(2)

Climate

The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Prenanthes alata var. sagittata Gray

Taxonomic and Nomenclatural Links

Flora North America treatment for Asteraceae
 Flora North America treatment for Prenanthes sagittata
Genetic information (NCBI Taxonomy Database)
 International Plant Names Index
 Taxonomic Information from the World Flora Online
 Integrated Taxonomic Information System

Additional Photo Sources

Images From CalPhoto
UT Austin's Native Plant Database
 Google Image Search
 Flickr Image Search

General References

Google Scholar Search
Family References
 General Botanical References for BC
Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2020. E-Flora BC: Electronic Atlas of the Plants of British Columbia [eflora.bc.ca]. Lab for Advanced Spatial Analysis, Department of Geography, University of British Columbia, Vancouver. [Accessed: 2024-11-21 3:45:41 PM ]
Disclaimer: The information contained in the E-Flora atlas pages is derived from expert sources as cited in each section. This information is scientifically based. E-Flora also acts as a portal to other sites via deep links. As always, users should refer to the original sources for complete information. E-Flora BC is not responsible for the accuracy or completeness of the original information.
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