|
|
|
|
|
|
|
|
|
|
|
| Megalodonta beckii (Torr. ex Spreng.) Greene | Species Image Gallery (opens in a new window) |
||||||||
| TAXONOMY | |||||||||
| Family: | Asteraceae or Compositae | ||||||||
| Genus: | Megalodonta | ||||||||
| Species Synonyms: | Bidens beckii Torr. ex Spreng. | ||||||||
| Common Names: | water marigold Beck’s watermarigold Beck’s beggarticks |
||||||||
| DISTRIBUTION | |||||||||
| Canada: | southern British Columbia, central Saskatchewan – Nova Scotia | ||||||||
| Saskatchewan: | central Saskatchewan; Little Amyot Lake – Cumberland Delta – Little Swan River | ||||||||
| Ecoregion: | Boreal Transition, Mid-Boreal Upland, Churchill River Upland | ||||||||
| HABITAT | |||||||||
| Saskatchewan: | in calm water up to 30 to 90 cm deep | ||||||||
| Associated Species: | Elodea canadensis, Lemna trisulca, Stuckenia pectinata, Utricularia macrorhiza | ||||||||
| RARITY STATUS | |||||||||
| Provincial
Status According to Harms (2003): |
Threatened |
||||||||
| Nature Conservancy Status: | G4G5T4 S1S2 |
||||||||
| Saskatchewan
Species at Risk Status: |
None |
||||||||
| COSEWIC Status: | None |
||||||||
| Megalodonta beckii is threatened because it is regionally restricted in the province. No immediate threats are known at this time. | |||||||||
| SPECIES DESCRIPTION | |||||||||
| Growth Habit: | aquatic | ||||||||
| Roots: | fibrous | ||||||||
| Stems: | flaccid, green to black or reddish | ||||||||
| Leaves: | submerged leaves opposite, 3 – 4 cm long, 3 – 4 cm wide, deeply filiform-dissected; leaves on the surface opposite, to 2 cm long, to 1 cm wide, ovate to lanceolate, base cuneate, apex obtuse to acuminate, glabrous, margin serrate | ||||||||
| Leaflets: | opposite, sessile or nearly so, 11 - 23 (9 - 13 in SK), lanceolate, acute to acuminate tip, acute to obtuse base, glabrous, serrate margins | ||||||||
| Inflorescence: | heads solitary (2), terminal, to 1 cm wide; peduncles 20 – 100 cm long; phyllaries 7 – 8, 7 – 10 mm long, ovate, green | ||||||||
| Flowers: | ligulate florets 5 – 8, 10 – 15 mm long, oblong to obovate, conspicuously nerved, yellow; tubular florets 10 – 30, 5 – 6 mm long, pale yellow | ||||||||
| Fruits: | achenes terete, yellowish to greenish brown; pappus or 3 – 6 awns, 13 – 25 mm long, barbed, longer than achene | ||||||||
| |||||||||
