29S DESCRIPTIONS OF NEW SPECIES 



lines wide; rays oblong, slightly three-toothed; pednncles short and naked. Stem about a span 

 high. Pappus bright brown, barbellated. 



Xylorhiza *vilJosa, softly villous; leaves oblong-linear or snblanceolate, nm- 

 cronulate ; stem mostly one-flowered ; sepals of the involucrum lanceolate, very 



acute, nearly all equal; flowers large. 



Hab. With the above, but less abundant. Very similar to the preceding; root equally large and 

 woody. Flower as large as that of the garden marygold. Rays wide, and longer much than the 

 disk, pale red. Involucrum pubescent, nearly equal. A showy plant, well deserving of cultiva- 

 tion. Achenia very silky, as in the preceding. 



* BUCEPHALUS. 



Capitulum radiate, styliferous rays, fertile; liguli of one series (seven to fifteen;) 

 hermaphrodite florets of the disk fertile. Stigma slender, filiform, acumi- 

 nate, nearly smooth. Involucrum ovate, imbricate, of three or four series of 

 nearly similar ovate, carinated scales. Receptacle flat, alveolate, fimbrillate. 

 Achenia angular, pubescent (or smooth in C. alba.) Pappus about two se- 

 ries, scabrous, simple and clavellate. — Herbaceous perennials with nearly 

 simple stems, the summit, or the fastigiate branches, corymbose. Leaves 

 entire, the radical rarely serrulate. Disk yellow. Liguli pale purple or 

 white. — Plants with the habit of Galatella, and the pappus of Sericocarpus. 

 (The name alludes to the elegant appearance of the calyx.) 



t Achenia -pubescent, flowers purplish. 



Bucephalus ^elegans; minutely scabrous; stem attenuated; leaves all entire, 

 linear-lanceolate, sessile, acute, the lower three-nerved; flowers in a short, un- 

 equal, contracted corymb; sepals purplish, ovate, acute, one-nerved, pubescent 

 on the margin; rays purplish, about six or seven. 



Hab. Oregon plains and the Blue Mountains of the west. Flowering from September to Octo- 

 ber. — Avery elegant species, with a stout ligneous root, sending up a cluster of simple stems, two 

 to three feet high, thickly clad Avith erect leaves, becoming smaller towards the summit, one to two 

 inches long, by a quarter to half an inch wide, scabrous towards the margin ; branchlets about an 

 inch long, one-flowered; capituli eight to twelve in number. Involucrum of four series of very 

 elegant, purplish, ovate, acute, appressed, carinated scales, conspicuously pubescent along the 

 margin. Rays three-toothed, about six to seven, rather narrow and distant, pale purple ; tubular 



