110 PROCEEDINGS OF THE AMERICAN ACADEMY 



Mountains. To these are to be added the eighteen species * of more 

 limited range upon the mainland, confined to Southern California or 

 Western Arizona ; very few of them, so far as their distribution is 

 known, belonging to Lower California or Mexico, and several of rare 

 occurrence. Among the latter is Crossosoma Califoraicum, known 

 previously only from the Island of Santa Catalina, in the Santa Bar- 

 bara Archiiielago, of which genus the one other species is found in the 

 mountains of Western Arizona. Leptosyne gigantea and Stenochloe 

 Californica were also* known only from the same island, the latter the 

 only species of the genus ; the former belonging to a small genus con- 

 fined to Southern California and the region eastward to New Mexico. 

 It is evident, therefore, that, as regards the species common to the 

 island and the mainland, the flora may be said to be exclusively Cali- 

 fornian in its character. Not a single species is found that is peculiar 

 to Lower California or Mexico. The same alliance is nearly as prom- 

 inent if we look at the twenty-one new phaenogamous species of the 

 island. Fifteen of these (a Thysanocarpus, a Spliceralcea^ a Lupiniis, 

 a Trifolium, an (Enothera, a Megarrliiza. a Galium, a Hemizonia, a 

 Perityle, a BcBvia, a 3Iimulus, a Pogogyne, a Culamintha, a Phacelia, 

 and an Atriplex) all belong to genera largely or exclusively repre- 

 sented in California and the region east of it, and are mostly closely 

 allied to the species of that region. The remaining six species include 

 a Lavatera, a Composite, a Borraginaceous plant, a species allied to the 

 Olive, and finally a palm. The Lavatera is intei-esting as represent- 

 ing a widely scattered genus, not otherwise found in America, except 

 as a second species occurs on the more northern island of Anacapa. 

 The genus belongs chiefly to the region of the Mediterranean, where 

 fourteen species are native ; two others are confined to the Canary 

 Islands ; another has been discovered in Central Asia, and still another 

 in Australia. The new Composite is referred by Dr. Gray to a South 

 American genus {Diplostephiuni), not otherwise represented in our 

 flora, but of which there are eighteen species in the Andes from the 

 equator soutlivt^ard. Of the Borraginaceous and Oleineous species, 

 Dr. Gray forms new genera; the one {Harpagonella) allied to the 

 small genus Pectocarya, of which there is one Chilian species, and 



* Crossosoma Californicum ; Lepidium Menziesii and lasiocarpum ; Rhus laurina ; 

 Hosackia argophylla ; Leptosi/ne fjigantea ; Filugo Arizonica ; Perityle Emori/i ; Am- 

 b/yopappus pusillus ; Malacothrix Clevelnndii ; Antirrhlmim Nuttcdliannm and A. 

 speciosnm : Lycium Cnlifornicum ; Eritrichium angustifolium ; Pinus insiynis ; Cu' 

 pressus macrocarpa ; Muhlenbergia debdis; Stenochloe Californica. 



