VEGETATION OF MT. ST. HELENA. 109 



regarded as local on Hood's Peak, was found at the base of pro- 

 jecting rocky masses near the trail at about 2,600 feet. Antm-- 

 hinum virga, also on Hood's Peak, aud collected (ni Uncle Sam 

 Mountain and on Howell Mountain by the writer, was found with 

 the preceding. Lupinus sericatus, first collected on Cobb Mountain, 

 ten miles north, was quite abundant at 2,400 feet. A local form 

 of Adenostegia Pringlei, which is at home on the higher Coast 

 Ranges northward, is described below. The only southern plants 

 appearing here that I regard as worthy of note are as follows : 

 Peucedanum Sassei, first collected near Los Angeles and later on 

 the Vaca Mts. by the writer, and Bigelovia arborescens, common on 

 Mt. Tamalpais, and other more southerly mountain summits and 

 ridges. Ceanothus foliaceus, peculiar to the neighboring mountain 

 country bounding Napa Valley and south westward to Mt. Tamal- 

 pais, was quite abundant. Lastly there is to be noted Arctostaphylos 

 Stanfordiana, peculiar to the Mayacamas Range from Howell Moun- 

 tain northward to Cobb Mountain. While the number of local 

 species is thus small, it is likewise true that the number is not so 

 insignificant when compared with the total number of plants 

 recorded. 



The flanking spurs and ridges upon which the main mountain 

 mass rests are very nearly of the same height on the several sides 

 of the mountain, and the volcanic rock extends well down to these 

 lower fertile slopes. The grade of the Clear Lake road passes over 

 the southeastern flanking ridge at the very base of the abrupt upper 

 mountainside. This divide is 2,300 feet in height. About 100 

 feet above this the volcanic rock is very evident, trees disappear, 

 and there is nothing larger than brushwood. No plants below 

 2,400 feet were recorded, which is about the upper limit of all trees 

 except pines. Between 2,400 and 4,343 feet the altitudes given 

 are only approximate. 



The first explorer to reach the summit of Mt. St. Helena was 

 the Russian botanist, Wossenessky, and his companion, Tschnerich, 

 who formally named the mountain in honor of the Russian empress 

 on the date of the visit, June 12, 1841. I find no record of any 

 plants collected by them on or near the mountain. The writer has 

 visited the summit on three occasions: first on May 4, 1893 ; again 



