However, contrary to Merrill's (1908) segregation, Regalado (1995) combined this with the regionally widespread and morphologically variable species Medinilla myrtiformis (Naudin) Triana.
Some palaeontologists see a single, variable species called Homo habilis.
"My hunch," Dr. Lieberman wrote, "is that the Dmanisi and early African H. erectus fossils represent different populations of a single, highly variable species".
A single variable species, F. grandifolia (American beech), occurs in eastern North America and Mexico, and another, F. sylvatica, is found in Europe.
There are reports of hybrids between these two species, and even suggestions that they may be better treated as a single variable species.
The jury is still out, and whether one considers this a single and variable species or four separate species is to some extent a philosophical one.
This is a highly geographically variable species, and it has been suggested that it is best to separate it into various species level units.
Stands established without chemical site preparation retained more post-harvest woody and vine species and had less variable species turnover than chemically prepared stands.
For each response variable (species richness and percent cover), we compared three treatment pairs: burn vs control, thin vs control and thin vs burn.
Four subspecies have been described for this geographically variable species, which is one of the most attractive flowerpiercers, and ranges over the east slope of the Andes from northern Peru to northwest Bolivia.
ε 2 variable species diffusivity parameter (m2/s).
