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Tenth leaf or leaflet undersurface pubescence

These features refer to the tenth leaf stage. The tenth leaf is the tenth true leaf produced after the cotyledons. On seedlings with alternate or spirally arranged leaves it is just simply the tenth leaf produced.  On seedlings with opposite leaves it is one of the leaves in the fifth pair of true leaves produced.  On seedlings with whorled leaves it will be one of the leaves in the appropriate whorl; e.g. if there are four leaves in each whorl then the tenth leaf will be one of the leaves in the third whorl.

The undersurface of the leaf (or leaflet in the case of compound leaves) as seen with a x10 lens.


S67 undersurface smooth

No hairs visible with a x10 lens.

S68 undersurface hairy

Hairs visible with a x10 lens.  The minimum requirement for a hairy undersurface is that the midrib and all the main lateral veins are either hairy or prickly.