AND GENERA OF PLANTS. | 447 
white-flowered. . Upper part of the stem almost naked, paniculate, the branchlets corymbose and 
few-flowered. The involucrum of about two series, and slightly bracteolate. The flowers about 
the size of those of H. Gronovii. Achenium dark brown, slender, but truncated, striate and angu- 
lar, as usual. Pappus scabrous, brittle, yellowish-white. The radical and lower leaves are for the 
most part repandly dentate, the teeth shallow and rather distant. 
Meracium * argutum; leaves and base of the stem clothed with long deflected 
' hairs; stem smooth, paniculate, the branches divaricate, with long, naked and 
smooth pedicels; leaves oblong, or oblong-lanceolate, all incisely and sharply 
dentate, acute, the cauline sessile and few; involucrum small, slightly bracteo- 
late, smooth and blackish-green, of very few sepals in about two series; pappus 
gray and scabrous; achenium brown, and truncate as usual; flowers white? 
Has. In St. Barbara, Upper California. The only specimen I have collected is about twelve 
to fifteen inches high. The lower leaves three to five inches long, three-quarters to.an ineh wide, 
marked beneath with a strong mid-rib. The smoothness of all the upper part of the stem is re- 
markable: the achenium rather slender, and striated, as usual. The gray colour of the pappus is 
very peculiar. : 
