Jepson Flora Project: Jepson Interchange for California Floristics    
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Echinochloa oryzicola (Vasinger) Vasinger
POACEAE
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Information from the Index of California Plant Names (ICPN)
Current Jepson Flora Project Synonyms Echinochloa phyllopogon auct., non Stapf [see Correspondence 2]
Initial Editorial Analysis 22 Jul 2011
Source of Report for California Munz, P.A. in collaboration with D. D. Keck. 1968, as cited in Kartesz & Meacham
Initial Editorial Comments in no way mentioned in Munz; in Munz Supplement, p. 197, as Echinochloa oryzicola (Vasinger) Vasinger var. mutica Vasinger, "Rice fields near Biggs, Butte Co."; Echinochloa oryzicola (Vasinger) Vasinger var. mutica Vasinger listed as misapplied to Echinochloa oryzoides in The Jepson Manual [Ed. 1], listed as synonym of Echinochloa oryzicola in Kartesz & Meacham
Editorial Recommendation author citation to be checked [resolved]
Correspondence and Comments Subsequent to Initial Analysis
Correspondence 1 29 Aug 2003 e-mail from Dan Post see Comment 1
Editorial Comments 1 Correspondence 1 indicates that Echinochloa oryzicola is recognized as an introduced weed species in Flora North America, separate from Echinochloa oryzoides, and that author citation is Echinochloa oryzicola (Vasinger) Vasinger [therefore, author citation needs to be checked]
Correspondence 2 2 Dec 2013 and 3 Dec 2013 e-mail from Robert Price (Senior Seed Botanist; Seed Laboratory and Herbarium; California Department of Food & Agriculture), the former including forwarded e-mails from Mary Voorhees and Richard Moe see Comment 2
Editorial Comments 2 Correspondence 2 includes, initially, concern raised by Mary Voorhees that Echinochloa phyllopogon (Stapf) Stapf ex Kossenko was not but should have been treated in The Jepson Manual [Ed. 2], and includes reference by Bob Price to a paper by Costea & Tardif [2002. Taxonomy of the most common weedy European Echinochloa species (Poaceae: Panicoideae) with special emphasis on characters of the lemma and caryopsis. Sida 20: 525-548] in which Echinochloa oryzicola Vasinger and Echinochloa oryzoides (Ard.) Fritsch are both recognized, with Echinochloa phyllopogon auct. non Stapf listed as a synonym of the former, and Panicum phyllopogon Stapf as a synonym of the latter. [This taxonomy makes irrelevant the often cited fact that E. phyllopogon (Stapf) Kossenko, based on Panicum phyllopogon Stapf (1901), would have priority over E. oryzicola (Vasinger) Vasinger, based on Panicum oryzicola Vasinger (1931), were the two names in competition, because they are not in competition according to the taxonomic treatment by Costea & Tardif, which is consistent with the treatment in this Index and The Jepson Manual [Ed. 2], as well as Flora North America, and which has been adopted by CDFA according to Price. Both Echinochloa oryzicola and Echinochloa oryzoides are problematic weeds of rice fields that have evolved resistance to herbicides. There appear to be several records of Echinochloa oryzoides (Ard.) Fritsch in CCH that represent plants collected from qualifying habitats as well, outside of rice fields, suggesting that it is in fact naturalized in CA, as indicated in this Index and The Jepson Manual [Ed. 2]. Records in CCH of Echinochloa oryzicola Vasinger, on the other hand, evidently represent only plants collected from rice fields, so treatment of it in this Index as Jepson Flora Project-4 seems correct as well. According to Michael (Flora North America 25:402), Echinochloa oryzoides, relative to Echinochloa oryzicola, has: an earlier flowering period (June to July); a lax, strongly drooping panicle; awns on the lower lemma that are much longer and much more frequently present; is rarely obviously hairy on the cauline nodes, leaf sheaths, and collars; and has embryos that are 70--85% (vs. 89-98%) as long as the grain. As for the discrepancy in author citation, according to International Plant Names Index, Echinochloa oryzicola is based on Panicum oryzicola Vasinger, 1931; therefore, author citation corrected to Echinochloa oryzicola (Vasinger) Vasinger, from Echinochloa oryzicola Vasinger previously in this Index, 4 Dec 2013.]
Editorial Summary and Current Status
Editorial Summary rejection, agricultural weed
Current Status JFP-4, accepted name for taxon occurring in CA only as agricultural or garden weed
Current Status Authority The Jepson Manual [Ed. 2]
Current Status Date 22 Jul 2011
List of names for this Current Status category
List of ICPN names in Echinochloa
List of names from ICPN, Hrusa's Crosswalk, and Jepson Flora in Echinochloa

Resources of the Jepson Flora Project: External links:
·Distribution maps: County distribution based on CCH specimens
Manual imageJepson eFlora
link image ·Consortium of California Herbaria specimen records (includes links to BerkeleyMapper)
· Jepson eFlora page with bioregion map and CCH specimen records
Manual imageArchived Indexes from The Jepson Manual (1993; TJM1)
link image Jepson's "A Flora of California" (genus)
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