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| Tetraneuris acaulis var. acaulis (Pursh) Greene | Species Image Gallery (opens in a new window) |
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| TAXONOMY | |||||||||
| Family: | Asteraceae or Compositae | ||||||||
| Genus: | Tetraneuris acaulis var. acaulis | ||||||||
| Species Synonyms: | Actinea acaulis (Pursh) Spreng. Actinella acaulis (Pursh) Parker Hymenoxys acaulis (Pursh) Parker Tetraneuris simplex A. Nels. |
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| Common Names: | stemless bitterweed stemless four-nerve daisy stemless hymenoxys rubberweed |
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| DISTRIBUTION | |||||||||
| Canada: | southern Alberta – southwestern Saskatchewan | ||||||||
| Saskatchewan: | southwestern Saskatchewan; Cypress Hills – Matador | ||||||||
| Ecoregion: | Cypress Upland, Mixed Grassland | ||||||||
| HABITAT | |||||||||
| Saskatchewan: | dry grassland hillsides | ||||||||
| Associated Species: | Erigeron caespitosus | ||||||||
| RARITY STATUS | |||||||||
| Provincial
Status According to Harms (2003): |
Endangered |
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| Nature Conservancy Status: | G5 S1 |
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| Saskatchewan
Species at Risk Status: |
None |
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| COSEWIC Status: | None |
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| Tetraneuris acaulis var. acaulis is endangered because it is regionally restricted in the province and population sizes vary. Possible threats include occurrences in heavily populated areas, fragile habitats, or planned developments. | |||||||||
| SPECIES DESCRIPTION | |||||||||
| Height: | 10 – 30 cm | ||||||||
| Roots: | taproot woody | ||||||||
| Stems: | caudex thick, branched, persistent leaf bases with woolly axils; stems unbranched | ||||||||
| Leaves: | basal, tufted, 2 – 8 cm long, 2 – 3 mm wide, linear oblong to narrowly oblanceolate, apex acute, light green, silky-hairy, often silvery | ||||||||
| Inflorescence: | head solitary; phyllaries in 1 – 2 subequal series, 5 – 8 mm high, brownish with dark tips, silky villous | ||||||||
| Flowers: | ligulate florets 10 – 15, reflexed at maturity, 6 – 15 mm long, to 0.5 cm wide, 3-toothed, pistillate, fertile, yellow with orange nerves; tubular florets many, perfect, fertile, yellow | ||||||||
| Fruits: | achenes weakly 4-angled, coarsely pubescent with appressed hairs; pappus of 5 – 7 scales | ||||||||
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