Observations on Lycopersicon spp. a.  Desert  area:  The  only  species  common  in  this  area  seems  to  be  L. pimpinellifolium  found  in  the usual  situation:  irrigation  ditches,  cultivated  lands,  or  in  the  rainy  years  in  areas  along  the  fences intermingled with the natural desert vegetation that springs up in the area during such years (e.g. 1972). There is a 1972 collection of L. peruvianum (DHUNA 1080) from near the coast. This is the northernmost site for this species. b. Mountain zone: This zone is typical of any Peruvian valley of the northern region having a little more moisture than the southern part. A few populations of L. hirsutum have been reported in this area. Forma glabratum possibly reaches its southern limits here, although none of the accessions that we have grown  conform  well  with  Muller's  (1940)  concept.  The  altitude  range  for  this  species  is  between approximately  900  and  2500  m.  Two  collections,  La  Filadera  (1966)  and  Clark  (1974),  are  of  doubtful determination,   as   glandulosum   and      peruvianum   are   the   denominations   used   by   the   collectors, respectively. Collections  in  the  Piura  valley  are  meager.  It  is  included  in  the  Chira-Tumbes-Puyango  complex which has rarely been visited "taxonomically" and which should produce some valuable material since the  change  in  climatic,  altitudinal,  and  ecological  relations  into  typical  Ecuadorean  and  tropical conditions finds its transition zone here This area is also important for understanding the position of material in the Marañon drainage. Three possible connections exist between the latter and the coast: 1) Olmos-Jaen (Abra Porculla), 2) San Juan-Cajamarca (Abra Gavilán), and 3) Chiquian-Huanuco. The amount of  L. pimpinellifolium in the lower and middle Piura basin, Sechura desert, and Pampa de Olmos is probably the largest known, since it covers about 15,000 square kms. There are collections from  each  of  these  vast  surfaces  but  the  definite  plans  for  disturbance  by  man  through  the  Olmos, Chira-Piura,  and  Puyango-Tumbes  irrigation  projects  makes  the  need  for  collecting  urgent,  especially since it can be done only in one of those "rare" years when the desert region gets sufficient moisture for good seed germination and development of flowers and fruits. 2. Watersheds in the Lambayeque area: Olmos, L a Leche, Chancay, Reque and Sana (Table 6, fig. 2, 3) The Olmos is loosely separated from the Piura watershed by the Naupe mountains (altitude not more than 500 m) and meets the Huancabamba-Marañon eastern drainage at the Abra de Porculla (the lowest pass in the northern Andes of Perú). This makes the watershed separation pretty much academic from the point of view of interchange of plant material. A detailed floristic study of the area is thus justified to support such an interchange. The  area  from  Rio  La  Leche  to  Rio  Reque  on  the  other  hand  does  form  more  of  a  unit.  It  is  one vegetational complex in the lower part, especially since the completion of the Tinajones irrigation project. The  upper  drainages  are  separate,  the  Reque  going  much  deeper  into  the  Andes  and  having  a  much larger size than the La Leche. Seasonal rains in the mountains during November through April define the river flow modified now through the Tinajones dam at Chongoyape and the corresponding irrigation and drainage project. The Pampas de Olmos to the north and coastal areas in the valleys have sporadic rains in every 2 out of 5-7 years. Predominant crops are rice and chick-peas (Cicer spp.) in rotation and sugar cane. Fruits such as grapes, mango, avocado and miscellaneous species (mamey, ciruela (Spondia spp.) are found in home plantings. Some cotton (cv. del Cerro) and maize are grown throughout the region. Observations on Lycopersicon spp. The populations of L. pimpinellifolium are abundant especially from Mochumi north; the other species have been collected rarely. Worthy of mention is L. hirsutum of Abra de Porculla and Hda. Carrizal (between Chongoyape and Llama). These populations should be collected again and studied in terms of their relationship to those of  the  Ecuadorian  and  Marañon  basins.  The  migration  possibilities  here  are  real  due  to  the  above mentioned low altitude of the Andes at this point. In addition,

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