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Viola ×bissellii is a fertile hybrid between V. sororia and V. cucullata.  It is prolific and widespread, especially common in areas disturbed by humans.  Specimens exhibit a wide range of intermediate character states, including degree and location of pubescence, length and shape of petal ("beard") hairs, number of cilia on the sepals, and height of peduncles, which may overtop leavesBeard hairs are often from 0.5-0.9 mm in length and slightly expanded apically (i.e., intermediate between the corresponding traits of the parents).

Most texts don't provide complete descriptions of hybrids, incuding V. ×bissellii.  Haines (2011) describes this hybrid as:

". . . a sparsely pubescent, robust plant with sparsely ciliate sepals (at least on the auricles), slightly expanded petal hairs (i.e., intermediate between the two parents), variably prostrate to ascending cleistogamous peduncles, and a spurred petal that sometimes shows a few hairs. The corolla of this hybrid can be largely blue or is sometimes largely white with a blue ring around the white center."

We can suspect that plants matching the above description, especially where flowers are held above the height of the leaves, could be V. ×bissellii.

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See also:  Viola cucullata and Viola sororia.

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