*• PLANT M FRi; MONTI AIOE. 17 



uniseriali paleaceo (e squamcllis pluribus setaceis varie modo concretis) achenio 

 dimidio breviore superatum. Achenia disci infertilia, turbinata, pappo piloso 

 uniseriali elongato instructa ; setis rigidulis, tortuosis, denticulatis, valde inaequa- 

 libus, interdura subramosis. — Frutcx Californicus, ramosissimus ; foliis alternis, 

 brevibus, obovato-spatlmlatis, integerrimis, subsessilibus ; capitulis dense corym- 

 bosis ; floribus aureis.* 



* Amphipappus, Torr. & Gray, in Bost. Joum. Nat. Hist. 5. p. 4. 



AMPHIPAPPUS FREMONTII, Torr. $ Gray, I. c. Tab. IX. 



Hab. — Interior of California, in the mountains between 35° and 36° of North 

 latitude ; particularly on the Mohave River and other tributaries of the Colorado : 

 flowering in April. 



A smoothish shrub, growing about a foot and a half high, with numerous slender, 

 whitish, corymbose branches. The leaves are from half an inch to three fourths 

 of an inch long, nearly glabrous, of a rather thick texture, mucronate at the tip, and 

 tapering at the base into a short petiole. The flowers are yellow, in numerous 

 heads, which are three or four lines long, in clusters of from three to five each, 

 and disposed in somewhat naked corymbs. The involucres are nearly glabrous ; 

 and the oblong obtuse scales are of a pale straw color. There is but a solitary 

 ray-flower, the ligule of which is obovate, entire, and about one third as long as 

 the involucre. Its achenium is villous, and crowned with a paleaceous pappus of 

 five or six scales, which are deeply cut into several unequal subulate segments, or 

 rather consist of bristles variously united. The disk flowers are usually five in num- 

 ber, infundibuliform, with a slender tube, 5-cleft ; the segments revolute. Stamens 

 at length exserted ; the anthers furnished with a subulate appendage at the tip. 

 The achenia of the disk are apparently always infertile, though containing a large 

 and well formed ovule. They are crowned with a setose pappus which is nearly 

 as long as the corolla. Its bristles are usually very tortuous, and sometimes forked 

 or rather united in pairs, at the base. 



This rare Composita belongs to the subtribe Asterinese of the tribe Astereae, and 

 to the division Chrysocomeae. It resembles in many respects Solidago, parti- 

 cularly the sections Euthamia and Chrysoma of that genus, from which it differs 

 in the involucre and in the dimorphous pappus. In its involucre and general habit 

 it more nearly resembles Guttierrezia, and might be referred to that genus were it 

 not for the truly pilose or setose pappus of the disk-flowers. 



SARCODES, Nov. Gen. 



Calyx quinquesepalus, marcescens ; sepalis concavis, basi vix gibbosis. Corolla 

 campanulata, persistens, quinquelobata ; lobis ovatis, erectis. Stamina 10, hypo- 

 gyna : filamenta subulato-filiformia : antherce oblongce, biloculares, didymas, fere 



