108 ERYTHEA. 



more or less all over the mountain, and there is quite an abundant 

 young growth four to eight feet high, on the lateral spur of the 

 second ridge spoken of above. On the southern face of the moun- 

 tain are many fallen trunks denuded of bark, but with as many as 

 fifteen and eighteen whorls of persistent cones. Pseudotsuga 

 taxifolia grows plentifully on the northeastern side of the mountain, 

 especially about the cliffs in that neighl)orhood. Trees fifty to 

 sixty feet high grow not far from the highest summit. Razoumofskya 

 occidentalis was discovered on Pinus atteituata on the first summit. 



There was a conspicuous lack of lierbaceous species above 3,000 

 feet and not a sign of an annual. Of herbaceous perennials exclu- 

 sive of parasitic forms, there were found only Hypericum coucinnum, 

 Pedicularis densiflora, Monardella odoratissima and Zygadeuus 

 Fremonti. The total number of species collected above 3,000 feet 

 was twenty-one. They were in no sense peculiar, all being common 

 inhabitants of the Coast Range Mountains. These plants, both of 

 shrubs and herbaceous perennials, are, however, those species which 

 have been most successful in developing adaptations to the very 

 arid and gravel-covered areas of the high Coast Range ridges. 



The edges of the volcanic sheet yielded by far more plants of 

 interest than the broad summits of the mountain. Above 2,400 

 and up to 3,000 feet were found the greater number of species 

 given in the list. This zone extends from the upper limit of the 

 Kellogg Black Oak, as trees, to the upper limit of Ceanothus foliosus, 

 which is about 2,800 to 3,000 feet. In this area were found a 

 number of species sufficient to extend consideriibly the list of plants 

 of the summit. But even the plants collected here were not 

 remarkable as yielding the rare or peculiar species of the summits 

 of Mt. Diablo, Mt. Hamilton, and other peaks south of the bay of 

 San Francisco. The rarities collected here were of an entirely 

 different character. It was soon evident that close search would 

 reveal the recurrence on the edges of the volcanic sheet of a signifi- 

 cant number of plants of only a few known stations belonging to 

 the highest summits of the Coast Range ridges and peaks north of 

 the bay of San Francisco. The rare Campanula augustiflora, 

 Eastwood, collected on the mountain by Mrs. Brandegee, has been 

 found elsewhere but on Mt. Tamalpais. Pentstemon Sonomensis, 



