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Example(s): Example sentences from FOC V18, V22 :  among 5 staminodes, 3 opposite to petals, other 2 inconspicuous and resembling an extension of column ridges;  Leaves 2.5–7 (–8 )cm 2–3 (–4 )mm, rather rigid, margin scabrous, apex acuminate, veins inconspicuous.
- Categorical Glossary for the Flora of North America Project, by Robert W. Kiger and Duncan M. Porter. 2001. Hunt Institute for Botanical Documentation.