12 ERYTHEA. 
northern outskirts of which there is no difficulty in tracing 
along the lower slopes of Mt. Hannah and on the volcanic 
ridges in the neighborhood of Uncle Sam Mountain. Just 
beyond this Knoxville ridge one meets for the first time with 
plants indicative of what I have termed the “Clear Lake 
Region.” The composition of the “chaparral,” or dense 
brush of the higher mountain slopes, is similar to that of 
other portions of the Coast Range; Adenostoma, Cercocarpus, 
Ceanothus and Arctostaphylos abound. There are, besides, 
bunches of Garrya Fremonti, scattered individuals of 
Ceanothus divergens, Quercus dumosa, var. bullata, in 
abundance, and occasionally Rhamnus ilicifolia. Here, too, 
I met for the first time the yellow blossoms of Capnorchis 
chrysantha, while the marshy spots about springs were 
bright yellow and ashen gray, with the colors of Senecio 
Clevelandi, and Stachys albens. Erythroea trichantha grows 
too in rather moist places, and there are in the driest soil, 
such more common plants as Linum Californicum and L. 
spergulinum, Hypericum concinnum, Eriogonum dasy- 
anthemum, Galium Andrewsii, and Gnaphalium Cali- 
fornicum. 
A considerable elevation is reached again on the slopes 
south of Uncle Sam Mountain. The “opens” in the “chap- 
arral” blush with an amount of color unusual in the Coast 
Range in the last days of J uly. There is Hypericum 
anagalloides, the beautiful scarlet Silene Californica, 
Eriogonum viminewn, very common, Clarkia rhomboidea, 
Mentzelia micrantha, Eriophyllum caespitosum, Gompho- 
carpus cordifolius, in fruit, Phacelia ramosissima, Emmen- 
anthe penduliflora, Antirrhinum virga, Penstemon azureus, 
Eunanus Bolanderi, in a rank bushy form a foot and a half 
in height, and Verbena prostrata; while on the “bottle- 
stone” or obsidian formation, grows Chorizanthe Clevelandi, 
Oxytheca hirtiflora, a Nemacladus of uncertain species, 
Scutellaria Bolanderi, and Quercus Wislizeni in a shrubby 
orm. 
One or two small marshes border the shores of Clear Lake 
