Iva axillaris |
Iva frutescens |
|
---|---|---|
death weed, deep-root, deer root, poverty-weed |
bigleaf sumpweed, Jesuit's bark, maritime marsh-elder |
|
Habit | Perennials, 10–40(–60) cm (rhizomatous). | Subshrubs or shrubs, 50–350 cm. |
Stems | erect (usually herbaceous). |
erect. |
Leaves | petioles 0–3 mm; blades narrowly ovate or obovate to elliptic or spatulate, 15–25(–45) × 3–8(–15) mm, margins rarely toothed, faces usually ± strigose to scabrellous, gland-dotted. |
petioles 5–10+ mm; blades ovate or elliptic to lanceolate, 30–60(–120+) × 5–30(–40) mm, margins usually toothed, faces closely scabrellous, gland-dotted. |
Peduncles | 1–2 mm. |
1–3+ mm. |
Involucres | ± hemispheric, 2–3 mm. |
± hemispheric, 2–4 mm. |
Pistillate florets | 3–5(–8); corollas 0.5–1.5 mm. |
(2–)5; corollas 0.7–1 mm. |
Phyllaries | outer 3–5 ± connate, ± herbaceous. |
outer 5 distinct, ± herbaceous. |
Heads | in ± racemiform arrays. |
in ± racemiform arrays. |
Cypselae | 2.5–3 mm. |
2–3 mm. |
Paleae | linear, 1.5–2 mm. |
linear to subulate, 2.5–3 mm. |
Functionally | staminate florets 4–8(–20+); corollas 2–2.5 mm. |
staminate florets 3–8(–15+); corollas 2–3 mm. |
2n | = 36, 54. |
= 34. |
Iva axillaris |
Iva frutescens |
|
Phenology | Flowering May–Oct. | Flowering Jul–Oct. |
Habitat | Seasonally wet, saline habitats | Mostly tidelands, brackish to saline marshes, beaches |
Elevation | 10–2500 m (0–8200 ft) | 0–10 m (0–0 ft) |
Distribution |
AZ; CA; CO; ID; KS; MN; MT; ND; NE; NM; NV; OK; OR; SD; TX; UT; WA; WI; WY; AB; BC; MB; SK
|
AL; CT; DE; FL; GA; LA; MA; MD; ME; MS; NC; NH; NJ; NY; PA; RI; SC; TX; VA; NS
|
Source | FNA vol. 21, p. 26. | FNA vol. 21, p. 26. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Ambrosiinae > Iva | Asteraceae > tribe Heliantheae > subtribe Ambrosiinae > Iva |
Sibling taxa | ||
Synonyms | I. axillaris var. robustior | I. frutescens subsp. oraria, I. frutescens var. oraria |
Name authority | Pursh: Fl. Amer. Sept. 2: 743. (1813) | Linnaeus: Sp. Pl. 2: 989. (1753) |
Web links |