172 BOTANY. 



branched; branches procumbent or ascending, conspicuously angled and 

 striate, smooth; leaves 1-2' long, half a line wide, the margins copiously 

 provided with roundish, brown glands, with several lung bristle-like hairs at 



base ; peduncles 3-6' long, with several small scale-like bractlets, filiform ; 

 involucral scales linear-lanceolate, glandless or with but a single gland; 

 ray- flowers 7" long, pappus (ray) of two strong awns ; disk-flowers 4" long, 

 pappus (disk) of many unequal and scabrous bristles; achenia reddish, 

 angled and roughish. — A well-marked species from the Sanoita Valley, 

 Arizona (635). 



Pectis imberbis, Gray (PI. Wright. 2, p. 70). — Erect, much branched 

 herb, 1-2° high, smooth; leaves scattered, few, gland-dotted, filiform, 2-3' 

 long; inflorescence paniculate-cymose; pedicels bracteolate; involucre scales 

 lanceolate, obtuse, enfolding the ray-achenia; ray-flowers purple (as are 

 also those of the disk and also the involucre scales); blade oval and 

 twice as long as the tube; disk-flowers with the tube short and limb dilated 

 upwardly, very slightly bilabiate, a dark gland on each lobe. Achenia 

 (disk and ray) narrow, hairy; pappus of two small scales, with smaller 

 ones between, and some more or less lacerate. The plant emits a tere- 

 binthinate odor, and is almost as naked as though it had no leaves. — Sanoita 

 Valley, Arizona (636). 



Pectis prostrata, Cav. — Prostrate, branching herb, puberulent; leaves 

 broadly linear or lanceolate (1/ long and \\" wide), entire, and strongly 

 bristle-ciliate at base; heads sessile and somewhat congested; involucre of 

 five oval scales, which are truncate at top and hyaline on the margins, not 

 embracing the ray-achenia; limb of the ray-corolla less than twice as long 

 as the tube, and both combined shorter than the achenium; pappus (ray) 

 of 2-4 lanceolate, acute, somewhat lacerate scales, which are half as long 

 as the hairy achenium ; disk-flowers almost cylindrical, and not longer than 

 the five lanceolate, hyaline, and very acute scales of the pappus Achenia 

 narrow and hairy (almost hairy-tufted at the apex). The dark glands are 

 scattered throughout the entire blade of the leaf. — Dry open plains of 

 Southern Arizona (722). 



IIelenium autumnale,' L. — Utah. 



Helenium Hoopesii, Gray. — Sierra Blanca, Arizona, at 11,500 feel 



