Iva axillaris |
Iva angustifolia |
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deep-root, poverty weed |
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Habit | Herbs perennial, 1–6 dm. | |
Leaves | narrowly ovate to elliptic or spatulate, 10–50 × 3–15 mm; margins entire, rarely toothed; surfaces sericeous to scabrid. |
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Involucres | 2–3 mm. |
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Staminate flowers | 4–10(20); corollas 2–2.5 mm, equaling or slightly exceeding involucres, yellow. |
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Pistillate flowers | 3–8; corollas 1–1.5 mm, exserted. |
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Fruits | 2.5–3 mm; blackish, minutely gland-dotted. |
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Heads | unisexual; solitary in leaf axils; peduncles 0.5–3(6) mm. |
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2n | =36, 54. |
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Iva axillaris |
Iva angustifolia |
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Distribution | ||
Discussion | Pine woods, shrublands, riverbanks, lake shores, ponds, roadsides, disturbed areas. Flowering May–Sep. 0–1900 m. BR, BW, Casc, Col, ECas, Lava, Owy, WV. CA, ID, NV, WA; north to British Columbia, northeast to Manitoba, east to WI, southeast to TX. Native. This species is wind-pollinated, a somewhat unusual characteristic within Asteraceae. |
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Source | Flora of Oregon, volume 2, page 296 Kenton Chambers |
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Sibling taxa | ||
Synonyms | Iva axillaris ssp. robustior | |
Web links |
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