| Dicotyledon | Literature for Cyanthillium cinereum
Robinson, 2007; Wagner et al., 1990, 1999; Lorence & Wagner, 2020. |
| Asteraceae -- The Sunflower Family | Bibliography |
| Cyanthillium cinereum | |
Common name(s): ironweed, little ironweed |
| General Information | ||
|---|---|---|
| Distribution | Native to tropical Asia, widely naturalized.In the Hawaiian Islands, naturalized on Ni`ihau, Kaua`i, O`ahu, Moloka`i, Lana`i, Maui, Kaho`olawe, Hawai`i. |
|
| Habit |
Annual herb, erect or decumbent, (5‒)15‒30(‒150) cm tall; stems finely striate, tomentulose with T-shaped hairs, sometimes glabrate with age. |
|
| Leaves |
Leaves scattered along the stem, petiolate; blade ovate, ovate-rhombic, or lanceolate, usually 2‒5 cm long, 1.5‒2.5 cm wide, adaxial surface pubescent with T-shaped hairs, abaxial surface pubescent and glandular punctate, margin remotely toothed; petiole ca. 1.5‒2.5 cm long. |
|
| Flowers |
Heads with 12‒16 florets; involucre campanulate, 4‒8 mm high; bracts imbricate in 3‒4 series, 3‒5.5 mm long, apex purplish; corollas lavender to purple, 2.5‒6 mm long; pappus whitish, inner bristles 3.5‒4 mm long, deciduous, outer bristles ca. 0.2 mm long, persistent. |
|
| Fruit |
Achenes rounded, nearly ribless, ca. 1.5 mm long. |
|
| Contributor |
David Lorence |
