![](img016.GIF) |
The study area is illustrated in Figure 1 with
emphasis on water courses that riparian mesquites can follow. The
compositions of the 3 sites are made clear in Figures 2 & 3. Hermosillo
Group 1 is tall old trees that have 1 PR only like Navajoa, whereas the
other trees of 2-4 m including Mazatán & El Novillo are infiltrated by
velutine derivatives from the north since they carry 2 PR. Navajoa with old
trees > 10 m has Torreyana trees of 1 PR only.
Guaymas begins with a new element, the 24 mm rachis (24 LR) of the new race
Tiny of 1 PR only, that is not known elsewhere. The intermediates formed by
Tiny times torreyana are infiltrated slightly by 2 PR (Group 7). The few
torreyana trees of Guaymas (Group 8), < 4 m tall typify the former occupants
of the Hermosillo—Guaymas area, many having been > 10 m tall in former
times. Fluctuations in LR & LP as well as in the other foliar variables with
consequent high variance are common in most algarroban mesquites. These
distributions lie between uniform and normal. |