236 
definitely numerous capillary bristles; inner of 5 lanceolate long very 
thin scales with rib extended into a scabrous awn), 
1. N. Edwardsii Gray. Leaves attenuate-linear, few-lobed: heads somewhat 
naked pedunculate: involucre 12 mm. long, of 8 or 9 bracts: ligules much exserted, 
elongated-oblong, toothed at the truncate summit.—Sandy banks and plains of 
southwestern Texas. 
98. DYSODIA Cav. (FETID MARIGOLD.) 
Annual or biennial herbs dotted with large pellucid glands (which 
give a strong odor), with heads of yellow flowers terminating the 
branches, pistillate rays, one row of involucral bracts united into a 
firm cup (with some loose bractlets at base), flat receptacle (not chaffy 
but) beset with short chaffy bristles, slender 4-angled achenes, and 
pappus a row of chatty scales dissected into numerous rough bristles. 
1. D. chrysanthemoides Lag. Nearly smooth, diffusely branched: leaves oppo- 
site, pinnately parted, the narrow lobes bristly-toothed or cut: rays few, scarcely 
exceeding the involucre.—Alluvial soil, extending from the Mississippi Valley 
across Texas to Arizona. 
99. HYMENATHERUM Cass. 
Low herbs or shrubby plants (mostly pleasant-scented), with alter- 
nate or opposite leaves, usually radiate heads of yellow flowers, involu- 
cral bracts united high up into a cup (glandular-dotted or striped), 
mostly terete and striate achenes, and pappus of several or numerous 
scales (either 1 to 5-aristate or pointed, or partly resolved into as many 
bristles, or some or all of them entire and even truncate). 
* Pappus simple, of 18 to 20 scales, resolved above into about 5 or the alternate ones into 
3 capillary bristles : heads sessile (or nearly so) at the end of woody branchlets : 
leaves opposite, entire. 
1. H. acerosum Gray. Shrubby, low, rigid, exceedingly branched: leaves fili- 
form-acerose, usually with axillary fascicles of shorter ones: heads 6 to 8 mm. high: 
involucre with copious large oil-glands: rays oblong. (Aciphyllea acerosa Gray, 
Pl. Fendl.)—Western borders of Texas. 
** Pappus simple, of 10 rigid scales not longer than the thickish achene and much shorter 
than the disk-corolla, some of them entire witha single awn, others with 3 aristate- 
subulate tips: heads loosely calyculate: leaves alternate. 
2. H. tagetoides Gray. Rigid glabrous annual, fastigiately branched atsummit: 
leaves narrowly linear, laciniately and spinulosely dentate or almost pinnatifid: 
heads less than 12mm. high: involucre rigid, with bracts imbricated but connate 
almost to the tip: rays oblong, conspicuous. (Dysodia tagetoides Torr. & Gray, F1.) 
—Low prairies of Texas. 
*** Pappus-scales 10 to 20, all or the inner ones 1 to 3-awned, the awns about equaling or 
surpassing the disk-corolla: heads naked at base (or with some small and scanty sub- 
ulate bracts): rays oblong, conspicuous. 
+ Scales of pappus mostly alike and 3-awned (lateral awns shorter): glabrous leafy- 
stemmed herbs, 
3. H. polychetum Gray. Low and diffusely much branched, leafy to near the 
numerous short-peduncled heads: leaves pinnately parted into several short-filiform 
obtuse and pointless divisions: involucre 10 to 16-toothed: scales of pappus 18 or 20, 
