Contains 3 accepted taxa overall.

Characteristics
Melanthera Rohr
SQUARESTEM
Classification
ASTERALES
Melanthera
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.
Distribution Map Present

This species have been reported in the counties highlighted.

Species
Scientific Name Common Name Herbarium Specimens Status Photos
Melanthera angustifolia EVERGLADES SQUARESTEM Native
Melanthera nivea SNOW SQUARESTEM Native FACU (NWPL) FACW (DEP)
Melanthera parvifolia SMALL-LEAF SQUARESTEM Native Threatened-State
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
Genus Synonyms
Synonym Full Citation Basionym Type
Lipotriche Lipotriche R. Brown, Observ. Compositae 118. 1817. TYPE: Lipotriche brownei de Candolle
Melananthera Melananthera Michaux, Fl. Bor.-Amer. 2: 106. 1803. TYPE: Melananthera hastata Michaux, nom. illegit. (Bidens nivea Linnaeus) = Melanthera Rohr 1792.
Psathurochaeta Psathurochaeta de Candolle, Prodr. 5: 609. 1836. TYPE: Psathurochaeta dregei de Candolle
Wuerschmittia Wuerschmittia Schultz Bipontinus ex Walpers, Repert. Bot. Syst. 6: 161. 1846. TYPE: Wuerschmittia abyssinica Schultz Bipontinus ex Walpers