22.4 ERYTHEA. 
not yet in flower, some small lettuce or sow thistle; its affin- 
ities apparently with S. cernuus of the Colorado Mountains, 
though the rather crowded very small heads are quite erect. 
Ptiloria divaricata. Perennial, the tufted and diffusely 
branching stems in no degree woody at base, the monoceph- 
alous flowering twigs rather long, slender and divaricate: 
early leaves 2 inches long, linear-lanceolate, runcinately 
toothed; those of the growing branches subulate, less than an 
inch long, spreading or recurved, commonly with a few small 
runcinate teeth at base, those of the ultimate branchlets 
reduced to the short-subulate and almost spinescent: heads 4 
or 5 lines high, 6- to 9-flowered, the involucre subtended by 
imbricated bractlets: achenes angular, nearly smooth: pappus- 
bristles 12 to 15, brownish, slightly dilated and more or less 
joined into bundles of 3 at the naked base, the upper half 
strongly plumose. 
Foothills of the Kern Co. mountains, near Caliente, Calif., 
Norman C. Wilson, 1893. 
NOTES ON WEST AMERICAN CONIFERAi.—UL- 
By J. G. Lemmon. 
Bibliography of Two Californian Pines. 
The confusion which has prevailed concerning the Monterey 
Pine and the Knobcone Pine invites an examination of the 
earlier descriptions and of the many names that have been 
given these Californian species. 
’ MonrerEey PINE. 
The earliest writer who is known to me to have treated of 
a Californian pine is Loiseleur de Longchamps, who pt 
lished —1810 to 1825—what has become a classical treatise on 
trees and shrubs, usually referred to as ‘Nouveau Duhamel,” 
being an enlargement and continuation of the “ Traite”’ of 
Duhamel, the leading French dendrologist of the eighteenth 
century. 
