OF ARTS AND SCIENCES. :,7 



found in other localities.* Muleje, upon the western side of the Gulf, 

 90 miles from Guaymas, is described as in a dry, barren, and moun- 

 tainous region, where except in the very short rainy season the only 

 green vegetation to be seen is along the banks of a small crei k. 

 This place was visited early in dune, and again late in December. 

 Of the 49 species collected here, 24 occurred elsewhere, mostly at 

 Guaymas. Los Angeles Bay, also on the peninsula, about 200 miles 

 northwest from Guaymas, was visited at an unusually favorable time, 

 after a rain which was the first that had fallen in twenty-two months 

 and when vegetation was in full bloom. The surrounding country is 

 very mountainous, some of the ridges having an altitude of 2,000 to 

 3,000 feet. About a month was spent here (from November 22 to 

 December 20) and 112 species were collected, of which 23 had been 

 found previously. The remaining station was the island of San Pedro 

 Martin, lying about 80 miles northwest from Guaymas. This island 

 has a circumference of about 4i- miles and an altitude of 1,200 feet, 

 and is exceedingly rough and rocky, intersected by canons and largely 

 covered with guano. A very few small fig trees were found, but the 

 only useful wood is furnished by the Ccreus Pringlei, which forms 

 almost a forest over the summit. During an eight days' stay (Octo- 

 ber 24 to November 5) only 19 species were collected, of which seven 

 were not peculiar to the island. 



The characteristics of the flora of the region bordering the Gulf of 

 California, so far as shown by this collection, are for the most part 

 those common to the flora of the whole arid region of the interior, 

 from southeastern California, Arizona, and New Mexico southward 

 into Mexico, distinct in a great measure from that of California 

 proper on the one side, and that of the Gulf States on the other 

 Nearly or quite two thirds of the sjiecies range northward beyond the 

 Mexican boundary. In the mountains about Guaymas we find a < 

 siderable number that are identical with or allied to species thai have 

 recently been collected by Pringle and Palmer in the mountains 

 Chihuahua. We have here also probably the northern limit on the 

 Pacific coast of the tropical or subtropical genera Rkizophora, fftema- 

 toxyloiu Portlandia, Oitharexylum, Pedilanthus, Ficus, etc. The pro 



* Cultivated and introduced plants are not included in the numbers al 

 piven. Sixteen species of the collection are considered of this character, viz. : 

 Oligomeria glaucescens, Portulaca i, Gossypium herbaceum, Trip) 



foliuta, Melilotus parviflorus, Tamarindus Tndicus, Capsicum ca . C. an- 



mtum, Crescentia alata, B'tu vulgaris, Panicum sanguinale, Sorghum II 

 El usine Mgyptiaca, E. Indica, Eragrostis major, and Lolium 



