Contains 3 accepted taxa overall.
Characteristics
Classification
Citation
MELANTHERA Rohr, Skr. Naturhist.-Selsk. 2(1): 213. 1792.
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TYPE: Melanthera nivea (Linnaeus) Small (Bidens nivea Linnaeus) Lectotypified by Britton & Millspaugh, Bahama Fl. 449. 1920.
Species
| Scientific Name | Common Name | Status | Photos |
|---|---|---|---|
| Melanthera angustifolia | EVERGLADES SQUARESTEM | Native | |
| Melanthera nivea | SNOW SQUARESTEM | Native FACU (NWPL) FACW (DEP) | |
| Melanthera parvifolia | SMALL-LEAF SQUARESTEM | Native Endemic Threatened-State |
[Family identification key]
1. Fertile plants 0.5–2.2 m tall; main stems (2–)4–15 mm wide at the base of the plant; petiole (2–)5–40 mm long; larger leaf blades (2.5–)4–12 cm wide; inflorescence head 0.8–3.2 cm wide with 30–100 florets; larger phyllaries (2.5–)3–4 mm wide; corollas 7–9 mm long
1. Fertile plants 0.2–1 m tall; main stems 2–5(–7) mm wide at the base of plant; petiole 0–5 mm long; larger leaf blades 0.5–4 cm wide; inflorescence head 0.6–1.8 cm wide with 18–75 florets; larger phyllaries 1.5–3 mm wide; corollas 4.5–6.5 mm long
2
2. Leaf blades linear to elliptic (lower ones sometimes broadly elliptic or rarely all short and broadly elliptic), unlobed or scarcely lobed, usually 5–13 times long as wide; peduncles (2–)5–20 cm long; phyllaries 4–5.5 mm long; paleae 4–5 mm long
2. Leaf blades ovate to 3-lobed, rarely elliptic, 1–4 times long as wide; peduncles 2.5–10 cm long; phyllaries 4.5–7 mm long;paleae 5.5–7 mm long