SOME GENERA OP RAFIXESQUE, 131 



foriiian seaboard is deep green and entirely glabrous ; but the 

 leaves, dying away in summer before the flowering begins, 

 are wanting in herbarium specimens, and so the following 

 has long been confused with it. 



6. P. CANESCENS. Tall and stout, but parted above into 

 slender paniculate branches, the stem and leaves tomentulose : 

 heads few and scattered, about twice as large as in the last; ^ 



crer 



es. 



bristl 



This replaces P. virgaia ii\ the interior of middle Cali- 

 fornia, where it is very common. But it also occurs at 



Francisco Bay ; and in Napa Yalley, where 

 by the writer in 1874, and at that time 

 referred by Dr. Gray to '' S. panicidaia'' rather than to 

 virgata. The pubescence, and the sparse, not virgately dis- 

 posed heads at once distinjiuish it. 



it was collected 



o 



7. P. TOMENTOSA. StepJiauomeria tomcniosa, Greene, 

 Bull. Calif. Acad. ii. 152 (1886). Here again the inflo^ 

 rescenee is even more strictly and densely virgate than in P. 

 virgata, and the achenes and j^appus are as in that species ; 

 but the herbage is white-tomentose. Habitat, Santa Cru2 

 Island, where it has been found only by the writer. 



8. P. PLEUKOCARPA. Tall and stout, virgate-paniculate, 

 glabrous and glaucous : heads small, few-flowered : achenes 

 very light-colored (buff rather than brown), fusiform, rugose- 

 tuberculate between the salient rib-like angles ; pappus, 

 bristles numerous, distinct, plumose to the base, bright white, 

 very soft, deciduous. 



The only specimen knowu to me is of my own collecting, 

 ^ear Redding, Shasta Co., Calif., Sept. 1889; but the species 

 ^ay be common enough in those northerly foothills. I 



«iistook it for P. virgaia; but the character of the achenes 

 is very peculiar. In the related species, the angles are 

 elevated between as many deep and usually closed grooves. 



