typical coastal form has been found under a very dry situation along the road from Moro to Jimbe.
9. Watershed: Casma
(Table 12, fig. 5)
The entrance to the riverbed above the delta area around the city of Casma is made by crossing a
large dry creek on the northern side of the Rio Grande-Casma and then dropping into Yaután
(approximately 800 m). The vegetation and farming from here to Chacchan (2700 m) is typical of the
"quebrada" situations in the western side of the Andes. The main crops are corn, cassava, bananas,
papaya, and avocado. In most years there is a regular flow of water from December to June, but the
lower part around Casma is dry during the rest of the months.
Observations on Lycopersicon spp.
L. pimpinellifolium is common as a weed in cultivated fields and along stone fences from Yautan to
Pariacoto (1300 m). L. peruvianum with very small and finely divided leaflets is found from 800 m
(Yaután) to 3000 m (above Chacchan) while L. hirsutum var. typicum is the predominant species
especially from Pariacoto to 3300 m (desvio to Pira). In several cases the two species are intermingled
and thus sympatric through their common distribution. No evidence of intermediate forms has been
detected. Solanum pennellii has also been collected in typical dry wash situations between Casma and
Yautan.
10. Watersheds: Culebras, Huarmey and Las Zorras
(Table 13, fig. 5)
All three of these rivers are short and sporadic especially "Las Zorras" which could be better
considered a "huayco." Only L. peruvianum has been collected and with the exception of Yaucapampa
(Ochoa and Luna, No. 2968) all the accessions and specimens came from sites very close to the
PanAmerican Highway. The Culebras populations have been extensively studied and used and serve as a
standard of the typical coastal L. peruvianum (Rick 1963).
It may be useful to undertake a thorough search for accessions in this area to ascertain if we have
another "gap" such as the one between Moche and Casma, or if it is just a matter of not having been
collected thoroughly up to the time of this catalog.
11. Watershed: Fortaleza
(Table 14, fig. 6)
The Fortaleza river is intermediate in size with a fair amount of water throughout the year. The
lower part is in sugar cane while the middle is typically dry and narrow, and the upper part has the
common sierra combination of corn, cereals and potatoes.
Observations on Lycopersicon spp.
L. peruvianum and L. hirsutum var. typicum are found pretty much sympatric throughout their
distribution range in this watershed. No L. peruvianum has been collected below 2000 m. his may be an
oversight or an influence of modern agriculture (herbicide schedules) followed by sugar cane production
which has eradicated these species in the lower drainage.
The L. peruvianum from this drainage can be considered a separate mountain race as shown by its
distinct features (fig. 1) and by its crossing relations (LA 110, LA 1364, LA 1365, Rick 1963).
12. Watershed: Pativilca
(Table 14, fig. 6)
Although this is one of the largest coastal watersheds in size and inland depth, the collections of
Lycopersicon are scarce. The main reason seems to be its lack of accessible roads and the confusion
caused by the fact that the lower drainages of the Fortaleza and the Pativilca are in fact one with no
restrictions on migration and movement between them. This" area deserves a thorough collecting
expedition since there are indications of the distribution of
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