Lolium and Festuca in Monterey County, California

These are just some initial, very incomplete, rough notes so far.

On the origin of a taxon on iNat: "Lolium multiflorum x perenne".

-- Kunth (1833) includes Lolium boucheanum.
-- Kunth (1834 Vol. 2) includes Lolium boucheanum.
-- Rouville (1853) includes Lolium boucheanum (p. 33), citing Kunth.
-- I haven't yet found the point in the literature where someone said boucheanum was a hybrid and not a species.
-- Terrell (1968) revised the genus, with notes including: "Hybrids between L.perenne and L. multiflorum include (1) short-rotation ryegrass and (2) Oldenburg ryegrass (German Oldenburger Weidlelgras)." and "There appears to have been mud introgression in all characteristics; hence, their separation becomes arbitrary. Certain .authors (e.g. Vasek and Ferguson 1963) have expressed doubt that they are distinct species.". Terrell also provides a table 11 characters for each species, which aids in separating them or concluding a hybrid origin.
-- POWO accepts both L. perenne and L. multiflorum and names a hybrid as "Lolium × boucheanum" as "L. multiflorum × L. perenne" (https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:407425-1).
-- FNA (Darbyshire 2007) includes Lolium multiflorum and Lolium perenne, and recognizes that: "Hybrids between the two species are called Lolium xhybridum Hausskn"
-- TJM2 (Smith & Aiken 2012) combines perennis/e and multiflora/um under a single species Festuca perennis (annual/perennial) with an explanation that L. multiflorum etc. are not recognized because the relevant characters can be caused by environmental stress.
-- Matthews & Mitchell (2015) Plants of Mo Co combines all under F. perennis - presumably following TJM2.
-- Styer (2019) Flora of Fort Ord combines all under F. perennis - presumably following TJM2.
-- Keil & Hoover (2022) Vascular Pl of Slo Co combines all, like TJM2, M&M, and Styer.
-- The agricultural industry makes frequent online use of the terms "hybrid ryegrass" and "Lolium × boucheanum".

From this, my conclusion is that plants intermediate between multiflorum and perenne could be ID'ed on iNat as the hybrid, with guidance from keys like in TJM, FNA, and in particular, details by Terrell (1968). iNat follows POWO, and thus for now at least should not combine the taxa under F. perrenis as was done in TJM (2012) etc.

Publicado el junio 11, 2024 05:34 TARDE por fredwatson