Abstract
The new species Impatiens serusiauxii is described from Marojejy National Park in NE Madagascar. Impatiens serusiauxii differs from the morphologically similar I. manaharensis in the distinctly coriaceous linear-lanceolate leaves, the larger white flowers with dark red and yellow spots, the shape of the dorsal petal and the lateral united petals, and the shape of the lateral sepals and the lower sepal with spur oriented upwards. Impatiens serusiauxii is restricted to sclerophyllous montane cloud forest above 1100 m.
Highlights
The genus Impatiens (Linnaeus 1753) (Balsaminaceae) is a monophyletic and diverse genus with more than 1000 species (e.g., Yuan et al 2004; Janssens et al 2009) and is represented by at least 260 endemic species in Madagascar (e.g., Fischer & Rahelivololona 2002, 2004, 2007a, b, 2015a, b, c, 2016; Fischer et al 2003, 2017)
Diagnosis: Impatiens serusiauxii differs from I. manaharensis in the distinctly coriaceous linear-lanceolate leaves, the larger white flowers with dark red and yellow spots, the shape of the dorsal petal and the lateral united petals, and the shape of the lateral sepals and the lower sepal with spur oriented upwards
Impatiens serusiauxii is restricted to sclerophyllous montane cloud forest above 1100 m, while I. manaharensis is found in lowland rainforest below 800 m
Summary
The genus Impatiens (Linnaeus 1753) (Balsaminaceae) is a monophyletic and diverse genus with more than 1000 species (e.g., Yuan et al 2004; Janssens et al 2009) and is represented by at least 260 endemic species in Madagascar (e.g., Fischer & Rahelivololona 2002, 2004, 2007a, b, 2015a, b, c, 2016; Fischer et al 2003, 2017). 32 palm species found in the Marojejy area are endemic to Madagascar, seven of which are restricted to the park (Dransfield & Beentje 1995)
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