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Lennooideae
Lennooideae is a subfamily of parasitic flowering plants of south-western North America and north-western South America.
The relationships of this subfamily to other plants remain uncertain. It was traditionally treated at family rank as Lennoaceae, and placed in different orders by different authors, including Lamiales (in the Cronquist system) and Solanales (Dahlgren system). More recently, molecular phylogenetic publications grouped it within the clade "Euasterids I", and most recently, it was demoted to a subfamily of the Boraginaceae family in the APG II system.
This subfamily has a disjunct distribution, occurring in Colombia as well as a separate area in south-western North America, covering parts of California, Arizona and Mexico. It comprises up to three genera, ''Ammobroma'', ''Lennoa'' and ''Pholisma'', which between them hold around five species, including the desert Christmas tree, ''Pholisma arenarium'', and sandfood, ''Pholisma sonorae''.
Members of this subfamily are succulent, herbaceous plants with no chlorophyll. The leaves are reduced to short scales, and the plants are entirely parasitic on the roots of their hosts, which are typically ''Clematis'', ''Euphorbia'' or various woody Asteraceae.〔
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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