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 long 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). 
PectTis 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. 
Valley, Arizona (636). 
PrcTis ProstRATA, Cav.—Prostrate, branching herb, puberulent; leaves 
broadly linear or lanceolate (1’ long and 14” 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 
Sanoita. 
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 (2lmost hairy-tufted at the apex). The dark glands are 
scattered throughout the entire blade of the leaf—Dry open plains of 
Southern Arizona (722). 
HELENIUM AUTUMNALE, L.—Utah. 
Heventum Hoopesn, Gray.—Sierra Blanca, Arizona, at 11,500 feet 
