OF AKTS AND SCIENCES : MAT 30, 1865. 551 



5 inches long, leafless and bractless. Involucre over half an inch in 

 length, of 7-12 linear scales, which coalesce to near their acute tips, 

 but are readily separable. Corolla light yellow. Branches of the 

 style linear and gradually produced into a slender subulate appendage* 

 Achenia linear, compressed, silky-pubescent, scarcely narrowed at the 

 base. Bristles of the pappus softly plumose, bright white, nearly equal- 

 ling the corolla. 



Raillardia (Raillardella) scaposa: foliis subspathulato-line- 

 aribus ciliolatis cum scapo elongato inferne nunc 1 - 2-phyIlo subvis- 

 cosis ; involucro cylindraceo-campanulato 20 - 30-floro, squamis vix 

 ultra medium coalitis ; receptaculo convexo subpiloso. — On a peak of 

 the Sierra Nevada, N. N. E. of Soda Springs, in sunny places, at an 

 elevation of 10,000 feet. Leaves narrower and mostly longer than in 

 the preceding species, 2^ to 4 inches long, including the slender taper- 

 ing base or petiole, wholly destitute of silvery pubescence, glabrous 

 except a slight glandular pubescence along the margins, and viscid. 

 Scape very slender, eight inches to a foot high. Head nearly an inch 

 long. Receptacle showing somewhat of the hairiness and convexity of 

 the genuine species of Raillardia. 



These two species are, perhaps, the most interesting botanical dis- 

 covery made by Professor Brewer. I had long since remarked that 

 Argyroxiphhcm and Wilkesia, — very peculiar Composites of the Sand- 

 wich Islands, — represent there the Madieoe so characteristic of Cali- 

 fornia and Oregon. We have here, in turn, two Californian plants so 

 intimately allied to a most characteristic Hawaiian genus, Raillardia 

 that, notwithstanding the difference in habit, I cannot venture to dis- 

 tinguish them generically. 



Artemisia potentilloides : Seriphidium, undique incano-sericea, 

 subpedalis ; foliis radicalibus bipinnatisectis, caulinis plerisque pin- 

 natipartitis, segmentis 3-11 Hnearibus nunc latiusculis ; capitulis 3-6 

 hemisphaericis (majusculis) corymbosis ; pedunculis gracilibus ; involu- 

 cri squamis circa 10 aequalibus obovatis, marginibus hyalinis ; recep- 

 taculo convexo hirsutissimo ; floribus corapluribus flavis. — Nevada, 

 near Carson City, Dr. C. L. Anderson. — A most distinct species, 

 with a tuft of simple ascending stems and bipinnately-divided silvery 

 leaves from a thickish caudex ; the cauline leaves few and small, an 

 inch or less in length, the uppermost reduced to simple linear bracts. 

 Heads 4 lines in diameter, depressed ; the flowers all hermaphrodite 

 and fertile. 



