Henssen A.
(1963):
The North American species of Placynthium -
Canadian Journal of Botany,
41: 1687-1724
A general survey is given of the morphology and anatomy of the genus Placynthium.
The species: aspratile, flabellosum, nigrum incl. v. tantaleum, petersii,
subradiatum, and stenophyllum are described in detail. The following new combinations
are made: Placynthium filiforme, Placynthium aspratile, Placynthium
subradiatum f. coerulescens, and Synalissa subnigra. The new variety Placynthium
stenophyllum v. isidiatum is established.
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