85 CONTRIBUTIONS TO WESTERN BOTANY 
Sinvitalia Abarti Gray. No. 23612 Dragoon pazs Ariz.,Sept 
1931, Involucral bracts scarcely distinguishable from the chaff 
on receptacle, but thin and hyaline-edged, green-tipped and green- 
striate, as long as chaff. Chaff very rigid, sharp, linear, convex, 
greenish-white, 6-8 mm. long, erect, with sunken green grooves 
as if ribs, subtending the disk akenes but not the ray ones. Rays 
ovate, rigid, leathery, convex in cross-section, 3-4mm. long, yel- 
low inside and light-colored on the outside, and with many green 
ribs, grown to the thick and obpyramidal akene which is trique- 
trous and 4 mm. long and 4 as wide at tip and truncate and 7-10- 
striate with green and sunken ribs, with 2 horns on the outside 
of the awns, the raised area included inclined to be corrugated, 
Disk akenes oblong but a little wider above, somewhat flattened 
and 7-grooved, black, warty on the ribs and with no pappus. Disk 
flowers smull and greenish. 1t has the habit of a low Heliomeris. 
Robust specimens from Rustler’s Park have rays 1 inch long, the 
leaves lanceolate and strongly toothed, obtuse, Zinnia-like. 
utchinsonia hyalina n. gen et sp. Plants belong- 
to the Polypteris section of Composite and apparently allied to 
liymenopappus. Erect perennials, somewhat woody below, corym- 
bosely branched above and with clusters of 6-8 heads in loose cor- 
ymbs the heads on filiform peduncles with linear and smooth 
bracta. Leaves many, pinnately dissected into linear segments, 
1-2 inches long, minutely hairy, gradually reduced above to linear 
bracts. Heads white, rayless, without chaff, with 10-20 flowers. 
4 inch high. Bracts oblong,rounded, hyaline, lacerate at tip, 
free, in 1 series, ashy, not embracing the black akenes which are 
truncate at tip and 5-angled or -ribbed, puberulent, linear, Co- 
rolla tube broadly oblong, contracted below a bulbous enlargement 
and then reduced to a tube, its lobes triangular and erect. Pap- 
pus of 5 linear, hyaline, pubescent scales with 1-3 strong ribs end- 
ing in plumose awns. : : 
Named for Mrs Susan W Hutchinson who was with me in 
Aaizona in.1931.and who. collected this at.Peach Springs.in .1932 
