Houstonia purpurea L. - Mountain Houstonia

Houstonia purpurea plant

Family - Rubiaceae

Stems - No info. yet.

Leaves - No info. yet.

Houstonia purpurea leaves

Inflorescence - No info. yet.

Houstonia purpurea inflorescenceInflorescence.

Flowers - No info. yet.

Houstonia purpurea flowers

Houstonia purpurea calyxCalyx.

Flowering - May - June.

Habitat - Moist or open rocky woods, rocky slopes, stream banks.

Origin - Native to U.S.

Other info. - This striking little species can be found in the Ozark region of Missouri. This species is easy to identify in the field because of its ovate leaves, which have 3-5 visible nerves, and its whitish-purple flowers, which are clustered at the apex of the stems.
Steyermark lists two varieties in Missouri. Variety purpurea has leaves which are 10-35mm broad and calyx lobes which are up to 4.5mm long at anthesis. This variety is pictures above. Variety calycosa Gray has leaves which are 4-12mm broad and calyx lobes which are 4-6.5mm long at anthesis.

Photographs taken in Brown Summit, NC., 5-18-02.


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