Swertia tosaensis
is an annual herb growing around oligotrophic marshes with erect
stems 5-30cm long, square cross-sections, and branching. Leaves
are in the shape of an oblanceolate, 2-5cm in length, with the tips
obtusely pointed. Corollas, 2-3cm in diameter, are white with light
purple stripes. Bloom time: October-November.
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