horned dandelion
Asteraceae (Aster family)
Introduction to Vascular Plants
Introduction click to expand contents
Apparently all our mini dandelions in the alpine are this species (BCCDC 2012). It is a highly variable species; for a taxonomic description, visit the Flora North America page (Barkley, Brouillet, and Strother 2012).
Although this species is now recognized in British Columbia, in the Illustrated Flora of British Columbia (Douglas et al. 1998), George Douglas provided the following write up on the genus Taraxacum in BC: "The genus Taraxacum has received widely varying treatments in North America. This is not unexpected in a group of plants in which hybridization, polyploidy, and apomixis are active. Some taxonomists (e.g., Ferris 1960, Weber 1967, Welsh 1974, Tayl. and MacBryde 1977, Douglas et al. 1989, Richards 1994, Cody 1996) recognize six or fewer native species (e.g., T. californium Munz. & Johnston, T. ceratophorum, T. eriophorum, T. lyratum, T. phymatocarpum and T. spectabile Dahlst.). Others have recognized 10 or more species (e.g., Fernald 1950, Hulten 1968, Scoggan 1979, Porsild and Cody 1980). The most conservative approach for our British Columbia species was taken by Boivin (1966-1967, 1972), Hulten (1968), Packer (1983) and Douglas (1989) who included T. eriophorum and T. lyratum within T. ceratophorum. Hulten (1968), however, included 45 "microspecies" under T. ceratophorum and still recognized nine other northern Taraxacum. I have recognized only one native Taraxacum species in British Columbia for several reasons. Of all the specimens I examined, only a small number would fit the description of the few species generally recognized. The remainder, when mature, represent an amazing array of variation that is often not repeated between sheets. In addition, most of the subalpine-alpine plants never set seed before the end of the short growing season, thus a key character, the achene, is often unavailable for determination. The time spent by several energetic Scandinavian taxonomists (e.g., G.A.H. Dahlstede, G. Haglund, and A.E. Porsild), formally naming several hundred "microspecies", has not enlightened the taxonomy of the genus. Even in recent years some taxonomists persist in naming every variation they encounter (e.g., Richards 1970). Until some brave taxonomist undertakes and successfully completes a thorough modern biosystematic study it would appear that the recognition of more than a single entity is not feasible. The following identification key may be used to separate our species: 1. Native, non-aggressive, high elevation species (except rarely along roads in extreme northern British Columbia)..................T. ceratophorum 1. Introduced, aggressive weedy species of disturbed sites. 2. Achenes red to reddish-brown or reddish-purple at maturity, the beak mostly 1-2 (sometimes 3) times as long as the body; leaves mostly deeply cut for their entire length, without an enlarged terminal segment, the lobes narrow; outer involucral bracts appressed to loose or sometimes reflexed; inner involucral bracts usually horned at the tips............................T. laevigatum 2. Achenes olive- or straw-coloured to brown at maturity, the beak mostly 2.5-4 times as long as the body; leaves usually less deeply cut, often with an enlarged terminal lobe; outer involucral bracts reflexed, inner involucral bracts not horned at the tips...........................T. officinale Source: Illustrated Flora of British Columbia 1998. Volume 1 |
Species Information click to expand contents
General:
Perennial herb from a simple or branched stem-base and a thick, often black, taproot; stems ascending to erect, solitary to several, simple, hollow, glabrous or sparsely long-hairy, exuding milky juice when broken, 3-60 cm tall.
Leaves:
Basal leaves lanceolate to oblanceolate, 1-35 cm long, 0.3-6 cm wide, tapering basally to a more or less winged stalk, nearly entire to toothed or more often pinnately lobed to pinnately cut, the terminal lobe often wider than the others, glabrous or nearly so; stem leaves lacking.
Flowers:
Heads with strap-shaped flowers, solitary; involucres 7-22 mm tall; involucral bracts in 2 series, the outer ones egg-shaped to lanceolate, appressed to ascending, glabrous or long-hairy, the inner ones lance-oblong, long-pointed, usually horned at the tips, rarely only slightly so; ray flowers yellow, sometimes purple-veined; disk flowers lacking.
Fruits:
Achenes 3-7 mm long, not including the beak which is slightly shorter than to 4 times longer than the body, straw-coloured to brownish, or red to brownish-red, or black to greyish-black, ribbed and often spiny above; pappus of numerous, 5-6 mm long, white hairlike bristles.
Illustration click to expand contents
If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.
Illustration Source: The Illustrated Flora of British Columbia
Ecology click to expand contents
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 |
||
|
Avg |
Min |
Max |
|
| Elevation
(metres) |
1723 | 252 | 2661 |
| Slope
Gradient (%) |
24 | 0 | 110 |
|
Aspect (degrees) |
206 | 5 | 350 |
| Soil
Moisture Regime (SMR) [0 - very xeric; 4 - mesic; 8 - hydric] |
3 | 0 | 8 |
| Modal
Nutrient Regime
Class |
D | ||
| #
of field plots species was recorded in: |
118 | ||
| Modal
BEC Zone Class |
BAFA | ||
|
All BEC Zones (# of stations/zone) species was recorded in |
AT(26), BAFA(33), BWBS(1), cma(1), ESSF(17), ICH(6), IDF(11), IMA(4), MS(5), SBPS(4), SBS(5), SWB(4) | ||
|
Source:
Klinkenberg 2013
|
|||
Habitat and Range click to expand contents
Status Information click to expand contents
Synonyms click to expand contents
Synonyms and Alternate Names:
Taraxacum eriophorum Rydb.
Taraxacum lyratum (Ledeb.) DC.
Taraxacum officinale subsp. ceratophorum (Ledeb.) Schinz ex Thell.
Taraxacum phymatocarpum J. Vahl
Taxonomic Keys click to expand contents
The genus Taraxacum has received widely varying treatments in North America. This is not unexpected in a group of plants in which hybridization, polyploidy, and apomixis are active. Some taxonomists (e.g., Ferris 1960, Weber 1967, Welsh 1974, Tayl. and MacBryde 1977, Douglas et al. 1989, Richards 1994, Cody 1996) recognize six or fewer native species (e.g., T. californium Munz. & Johnston, T. ceratophorum, T. eriophorum, T. lyratum, T. phymatocarpum and T. spectabile Dahlst.). Others have recognized 10 or more species (e.g., Fernald 1950, Hulten 1968, Scoggan 1979, Porsild and Cody 1980). The most conservative approach for our British Columbia species was taken by Boivin (1966-1967, 1972), Hulten (1968), Packer (1983) and Douglas (1989) who included T. eriophorum and T. lyratum within T. ceratophorum. Hulten (1968), however, included 45 "microspecies" under T. ceratophorum and still recognized nine other northern Taraxacum. I have recognized only one native Taraxacum species in British Columbia for several reasons. Of all the specimens I examined, only a small number would fit the description of the few species generally recognized. The remainder, when mature, represent an amazing array of variation that is often not repeated between sheets. In addition, most of the subalpine-alpine plants never set seed before the end of the short growing season, thus a key character, the achene, is often unavailable for determination. The time spent by several energetic Scandinavian taxonomists (e.g., G.A.H. Dahlstede, G. Haglund, and A.E. Porsild), formally naming several hundred "microspecies", has not enlightened the taxonomy of the genus. Even in recent years some taxonomists persist in naming every variation they encounter (e.g., Richards 1970). Until some brave taxonomist undertakes and successfully completes a thorough modern biosystematic study it would appear that the recognition of more than a single entity is not feasible.
The following identification key may be used to separate our species: 1. Native, non-aggressive, high elevation species (except rarely along roads in extreme northern British Columbia)..................T. ceratophorum 1. Introduced, aggressive weedy species of disturbed sites. 2. Achenes red to reddish-brown or reddish-purple at maturity, the beak mostly 1-2 (sometimes 3) times as long as the body; leaves mostly deeply cut for their entire length, without an enlarged terminal segment, the lobes narrow; outer involucral bracts appressed to loose or sometimes reflexed; inner involucral bracts usually horned at the tips............................T. laevigatum 2. Achenes olive- or straw-coloured to brown at maturity, the beak mostly 2.5-4 times as long as the body; leaves usually less deeply cut, often with an enlarged terminal lobe; outer involucral bracts reflexed, inner involucral bracts not horned at the tips...........................T. officinale Source: Illustrated Flora of British Columbia |