STUDIES IN THE CALIFORNIAN UMBELLIFERZ, 9 
size, more leafy stem, larger and more broadly winged fruit. 
There is a sharp cut about the leaflets in all stages not visible 
in specimens that represent well the type. Some of the oil- 
tubes, especially the lateral on the commissural face and 
those of the lateral intervals, branch and anastomose 
giving, in cross-section, the appearance of additional oil- 
tubes. An oil-tube surrounds the body of the fruit 
in the wing on the commissural face. One carpel of 
the pair has a strong longitudinal ridge; the face of the 
other is usually concave and the carpel empty. 
Peucedanum robustum. Acaulescent, glabrous, 2 feet 
high, with 1 to 3 peduncles; leaves ternate, then pinnate; 
leaflets broadly ovate or oblong, sessile, sparingly serrate or 
toothed above: peduncles and rays dilated at summit; rays 
15 to 21, unequal, $ to 8 inches long, pedicels sub-equal, 
2 lines long: fruit 24 to 3 lines wide, 44 to 5 lines long, the 
wing half as broad as the body; oil-tubes broad, solitary in 
the intervals, six on the commissural face, the lateral in pairs; 
no involucre nor involucels. 
Plains of the Sacramento, east of Cannon’s Station; in 
flower and in immature fruit, May 14, and in mature fruit, 
June 18, 1892. Most nearly allied to P. leiocarpum, first 
collected by Douglas, “near Fort Vancouver on the Columbia,” 
over five hundred miles north of the station in Solano 
County where the species under consideration was gathered. 
The differences do not however rest on geographical distances. 
P. leiocarpum has narrower petiolulate leaflets, longer and 
narrower fruit with narrower margins, fewer oil-tubes, and 
longer pedicels—these exceeding the mature carpels. In the 
original figure and description of that species (Hook. Fi. 
Bor.-Am. i, 263, t. 93) there is given no hint of the strikingly 
dilated peduncles and rays described by Nuttall and charac- 
teristic of the Californian plants referred to P. leiocarpum. 
As far as the illustration is concerned, this may be because 
the figure was drawn from a sterile specimen—such are said 
to be without this remarkable dilatation—but the plant was 
grown at Kew, and therefrom were drawn a figure and des- 
