Jepson Flora Project: Jepson Interchange for California Floristics    
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Spirodela polyrhiza (L.) Schleid.
ARACEAE (genus previously included in Lemnaceae)

Information from the Index of California Plant Names (ICPN)
Initial Editorial Analysis Nov 1 2001
Source of Report for California The Jepson Manual [Ed. 1]
Variant Spelling Spirodela polyrrhiza
Correspondence and Comments Subsequent to Initial Analysis
Correspondence 1 7 Apr 2008 e-mail from Jeff Greenhouse see Comment 1
Editorial Comments 1 Correspondence 1 indicates that there is disagreement regarding the spelling of the specific epithet in Spirodela poly(r)rhiza, in that: the name was published by M.J. Schleiden (Schleid. in Authors of Plant Names) with a double "l" [instead of a double "r"], in Linnaea 13:392 (1839), based on Lemna polyrhiza L., with a single "l" [instead of a single r; that is, not counting the first "l" in polyrhiza] (Species Plantarum 2:970--971. 1753); that the compound epithet is formed from two Greek roots, poly- and -rhiza; that Stearn, in addressing the classical spelling of such epithets (Botanical Latin, ed. 4:261. 1992), states that classically an additional "r" is inserted before rhiza when preceded by a vowel (yielding polyrrhiza); that, however, Stearn goes on to state "but as many reputable authors, Linnaeus among them, have omitted this additional r, it is best regarded as optional and an author's original spelling, as in Lemna polyrhiza, should be accepted."; that therefore Spirodela polyrhiza would be the correct spelling; and that Greenhouse found nothing in ICBN (2006) Art. 60 that would require a "correction" to add an extra"r"; and that he agrees with Stearn, International Plant Names Index, TROPICOS, Munz, and Jepson that Spirodela polyrhiza is correct. [Therefore, spelling of epithet corrected to Spirodela polyrhiza (L.) Schleid., from Spirodela polyrrhiza (L.) Schleid. previously in this Index, 29 Apr 2008.]
Editorial Summary and Current Status
Current Status JFP-1, accepted name for taxon native to CA
Current Status Authority The Jepson Manual [Ed. 1]
List of names for this Current Status category
List of ICPN names in Spirodela
List of names from ICPN, Hrusa's Crosswalk, and Jepson Flora in Spirodela

Resources of the Jepson Flora Project: External links:
·Distribution maps: County distribution based on CCH specimens
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Manual imageArchived Indexes from The Jepson Manual (1993; TJM1)
link image Jepson's "A Flora of California"
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