238 
100. PECTIS L. 
Mostly low and spreading usually glabrous heavy-scented herbs, with 
narrow opposite leaves conspicuously dotted with round oil-glands, and 
usually with copious slender rigid bristles at base, radiate heads of yel- 
low flowers, equal keeled involucral bracts in a single series, small 
naked receptacle, linear terete or angled achenes, and pappus of bristles 
or awns (sometimes chaffy at base), or of scales, or coroniform, or obso- 
lete. 
* Pappus of a few scales, or slender awns, or reduced to a chaffy crown, or obsolete, 
+ Pappus of conspicuous scales which are prolonged into awns: involucral bracts broad. 
1. P. prostrata Cav. Procumbent or prostrate: leaves oblanceolate or spatulate- 
linear: heads sessile or nearly so: disk-flowers 5 or 6: pappus-scales ovate-lanceo- 
late, often unequal, short-awned.—Southwestern Texas. 
++ Pappus of 1 to 6 scabrous awns, or reduced to a chaffy crown, or obsolete: involucral 
bracts linear, at length with involute margins partly surrounding outer achenes : 
low and much branched. 
++ Heads subsessile or short-peduncled, more or less Jastigiate or cymose at the end of 
branches. 
2. P. tenella DC. Pappus of 3 to 6 slender awns not much shorter than the 
achene; no scales or crown.—Southern Texas. 
3. P. angustifolia Torr. Lemon-scented: pappus a crown of 4 or 5 mostly connate 
scales, and sometimes 1 or 2 slender usually short awns. (Incl. P. fastigiata Gray, 
Pl. Fendl.)—Dry hills and plains of southern and western Texas. Dr. Havard says 
that this species and nos. 5 and 6 are lemon-scented, “with abundant star-like yel- 
low blossoms, filling the air with their fragrance.” 
++++ Heads scattered or solitary, on filiform peduncles terminating stem and diffuse branches, 
4. P. filipes Gray. Lemon-scented: involucral bracts 5: pappus of 2 or 3 (rarely 1) 
rigid subulate awns, with thickened bases and usually very short interposed scales, 
sometimes all united into a crown, or some disk-flowers destitute of pappus.— 
Mountains west of the Pecos. 
** Pappus of numerous capillary bristles and no scales. 
5. P. papposa Gray. Diffusely or divaricately much branched: leaves very nar- 
row and elongated, with very few bristles at base: peduncles once to thrice the 
length of the heads: involucral bracts 7 to 9: pappus of 12 to 18 unequal barbellate 
bristles in one series, occasionally reduced to a scaly crown, or quite obsolete.— 
Southwestern Texas, beyond the Pecos. (See note under no. 3.) 
6. P. longipes Gray. Forming spreading or depressed tufts: leaves crowded, 
conspicuously bristly at base: peduncles elongated, often scape-like, 7.5 to 10 cm. 
long: involucral bracts 12 or 13: pappus of ray-flowers setosely 2-awned; of the disk 
of 20 to 30 scabrous bristles, and of some small more attenuate outer ones.—South- 
western Texas. (See note under no. 3.) 
101. LEUCAMPYX Gray. 
Perennial flocculent-woolly (becoming glabrate) herbs, with pinnately 
dissected leaves, conspicuously radiate heads, broad equal involucral 
bracts in 2 or 3 series and with white-scarious margins, scarious chaff 
partly infolding the disk-achenes, 3-angled glabrous achenes with nar- 
rowed base and rounded summit, and pappus an obscure scaly soon ob- 
solete crown. 
