OF ARTS AND SCIENCES. 87 



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

 90 miles from Guayraas, 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 creek. 

 This place was visited early in June, aud 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 mouth 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 4^ miles and an altitude of 1,200 feet, 

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

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

 only useful wood is furnished by the Cereus Pringhi, which forms 

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

 ber 24 to November 5) only 19 .-pecies 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 species range northward beyond the 

 Mexican boundary. In the mountains about Guaymas we find a con- 

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

 recently been collected by Pringle and Palmer in the mountains of 

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

 Pacific coast of the tropical or subtropical genera Rhiznphora, Hcema- 

 toxylon, Portlandia, Citharexyhim, Pedilanthus, Ficiis, etc. The pro- 



* Cultivated and introduced plants are not includeil in tlie numbers above 

 sriven. Sixteen species of tlie collection are considered of this cliaracter, viz. : 

 Oiigomeris glaucescens, Portulaca oleracea, Goxsypium herbaceum, Triphasia tri- 

 foUata, MeUlotus parviflorus, Tamarindus Indicus, Capsicum cordiforme, C. an- 

 irium, Crescentia alata, Beta vulgnria, Panicum sanguinale, Sorghum Halepense, 

 E'.cnsine ^-Egyptiaca, E. Indica, Eragrostis major, and Lolium perenne. 



