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12. GYMNOSPERMA Less. 
Perennial herbaceous or suffrutescent erect glabrous mostly glutinous 
plants, with alternate entire narrow leaves, numerous small radiate 
heads of yellow flowers in fastigiately corymbose glomerate cymes, 
closely imbricated ovoid or oblong involucre with thick obtuse concave 
bracts, naked receptacle, very small ligules not surpassing the disk- 
corollas, oblong slightly compressed 4 to 5-ribbed glabrous achenes, 
and no pappus. 
1. G. corymbosum DC, Woody at base, 6 to 9 dm. high: leaves from oblong- 
lanceolate to linear: lower ones distinctly 3-nerved: flowers of the ray 5 to 9, of the 
disk mostly fewer and fertile.—Rocky soil, apparently throughout southern and 
western Texas. 
13. GUTIERREZIA Lag. 
Herbs or suffrutescent glabrous and often glutinous plants, with nar- 
rowly linear entire alternate leaves, small radiate heads of yellow 
flowers in fastigiate or paniculate cymes, closely imbricated oblong- 
clavate or turbinate to campanulate involucre with coriaceous green- 
tipped bracts, naked receptacle, short obovate or oblon g terete or 5 to 
10-ribbed achenes, and pappus of numerous chaffy scales, which are 
Shorter in the ray-flowers and sometimes wanting. 
*Pappus of ray and disk similar, or in the former shorter: ligules mostly short. 
+ Suffruticose: heads Sastigiately or paniculately cymose, mostly clavate-oblong: recep- 
tacle plane or small: pappus-scales conspicuous, from narrowly oblong to linear- 
subulate : achenes sericeous-pubescent. 
1. G. Sarothre Britt. & Rusby. Bushy and low, 1.5 to 4.5 dm. high: leaves nu- 
merous, 2.5 to 5 em. long: heads usually crowded, the disk- and short ray-flowers 
usually 3 or 4 each. (G. Euthamie Torr. & Gray)—Throughout Texas on arid 
plains and rocky hills. Var. MICROCEPHALA Gray (G. microcephala Gray) has smaller 
natrower fewer-flowered mostly oblong-cylindraceous heads (the flowers of disk and 
ray reduced to 1 or 2 each), and narrowly linear or nearly filiform leaves,—Southern 
Texas. 
+ + Annual herbs: heads singly terminating the branchlets and paniculate, hemis- 
pherical or obscurely obovate, about 4mm. in diameter : rays 9 to 15, disk-flowers 
20 to 30: receptacle more or less elevated and hirsute-fimbrillate : achenes very short, 
10-ribbed, the ribs very silky-villous. 
2. G. sphzrocephala Gray. Low: receptacle obtusely conical or hemispherical: 
pappus of 5 or 6 ovate short coroniform-concreted scales, barely half the length of 
the achene.—Southwestern Texas, 
3. G. eriocarpa Gray. Low or taller (3 to 6 dm. high): receptacle obtusely high- 
conical: pappus of 12 or more linear-lanceolate or subulate and mostly distinct 
scales, about half the length of the achene.—Plains and prairies of southern and 
western Texas. 
** Pappus wanting in the ray-flowers : ligules comparatively long. 
4. G. Texana. Torr. & Gray, Annual, effusely much branched, 6 to 9 dm. high: 
branches slender, bearing the very numerous pedunculate heads in open compound 
panicles: involucre turbinate-campanulate, 2 to 4 mm. long: rays8 or 10 (6 to 8mm. 
long); disk-flowers as many: achenes minutely pubescent; those of the disk with a 
minute pappus of ovate or subulate scales not as long as the breadth of the achene.— 
Sterile plains throughout Texas. 
