Iva imbricata |
Iva microcephala |
|
---|---|---|
dune marsh-elder, seacoast marsh elder, seacoast sumpweed |
Piedmont Marsh elder |
|
Habit | Perennials or subshrubs, 30–50(–100) cm. | Annuals, 10–70(–100) cm. |
Stems | ± decumbent to erect. |
erect. |
Leaves | petioles 0–2 mm; blades narrowly lance-elliptic to lanceolate or spatulate, 1–3(–6+) cm × 4–10(–20) mm, margins usually entire, rarely toothed, faces glabrous, rarely gland-dotted. |
petioles 0–1 mm; blades linear to filiform, 10–35(–60) × 0.6–1.5(–3) mm, margins entire, faces ± scabrellous, gland-dotted. |
Peduncles | 2–7+ mm. |
0.5–1 mm. |
Involucres | ± campanulate to urceolate, 5–7+ mm. |
hemispheric, 1.5–2 mm. |
Pistillate florets | 2–5; corollas 0.3–1.5 mm. |
2–3+; corollas 0.5–0.8 mm. |
Phyllaries | outer 6–10 distinct, ± herbaceous. |
outer 5 distinct, ± herbaceous. |
Heads | in racemiform arrays. |
in ± spiciform arrays. |
Cypselae | 4–5 mm. |
1–1.5 mm. |
Paleae | linear to spatulate (distally dilated), 5–6 mm. |
cuneiform to setiform, 1–2 mm. |
Functionally | staminate florets 8–12+; corollas 4–5 mm. |
staminate florets 3–5; corollas 1.8–2 mm. |
2n | = 34. |
= 32. |
Iva imbricata |
Iva microcephala |
|
Phenology | Flowering Jul–Oct. | Flowering Sep–Nov. |
Habitat | Dunes, beaches, at or near tidelands | Disturbed sites, moist or wet soils |
Elevation | 0–10 m (0–0 ft) | 1–100 m (0–300 ft) |
Distribution |
AL; FL; GA; LA; MS; NC; SC; TX; VA; West Indies (Bahamas, Cuba)
|
AL; FL; GA; NC; SC
|
Source | FNA vol. 21, p. 26. | FNA vol. 21, p. 28. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Ambrosiinae > Iva | Asteraceae > tribe Heliantheae > subtribe Ambrosiinae > Iva |
Sibling taxa | ||
Name authority | Walter: Fl. Carol., 232. (1788) | Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 346. (1840) |
Web links |