Parr 3, 1916] CARDUACEAE: TAGETEAE 211 
gland; ray-flowers 8-10; ligules yellow, 3-4 mm. long; disk-flowers 10-15; corollas 3 mm. long, 
the lobes lanceolate; achenes 4 mm. long; pappus of a crown of 4 or 5 short squamellae or rarely 
with 1 or 2 additional short awns in the ray-flowers (var. subaristaia), or in most of the flowers 
(P. fastigiata). 
TYPE LocaLity: Rocky Mountains. 
DistRiButTIoN: Nebraska and Colorado to Arizona, Sonora, San Luis Potosi and Tamaulipas 
(Fernald gives also Lower California, but specimen cited, Palmer 657, belongs to P. papposa). 
ILLUSTRATION: Bot. Mag. pl. 6286. 
52. Pectis tenella DC. Prodr. 5: 99. 1836. 
A low annual; stem 1 dm. high or less, dichotomously branched from the base, with 
‘ascending or spreading branches, angled, glabrous or slightly puberulent; leaves 1-4 cm. 
long, 1-2 mm. wide, linear, broadened at the base, pectinately divided (especially the lower) 
into 1—4 narrow lobes ending in bristles; glands conspicuous, marginal; heads fastigiate, sub- 
sessile or short-peduncled; peduncles rarely 5 mm. long; involucre turbinate, 4-5 mm. high, 
3-4 mm. broad; bracts 7-9, linear, prominently round-keeled, strongly involute, gibbous at 
the base, with a single conspicuous apical gland and sometimes 1 or 2 below; ray-flowers 7-9; 
ligules yellow, 3.5—5 mm. long, 1-1.5 mm. wide; disk-flowers 10-15; corollas about 3 mm. long; 
achenes about 3 mm. long, hirsutulous or glabrate; pappus of 2-6 unequal minutely scabrous 
awns. 
Type LocaLity: Near Laredo [Texas or Tamaulipas]. 
DIsTRIBUTION: Texas to Chihuahua and Tamaulipas. 
53. Pectis Pringlei Fernald, Proc. Am. Acad. 33: 76. 1897. 
A low annual; stem 5-10 cm. high, angled, with numerous spreading branches, glabrous; 
leaves linear-filiform, 1-2 cm. long, barely 1 mm. wide, with 2-3 pairs of basal bristles; glands 
marginal; heads in corymbiform leafy cymes; peduncles 1.5—2.5 cm. long, angled; involucre 
5-6 mm. high, 4-5 mm. broad; bracts about 8, strongly keeled below, flat above, linear, with a 
conspicuous apical gland and 1 or 2 smaller glands below; ray-flowers mostly 8; ligules oblong, 
yellow, 5—6 mm. long; disk-flowers 15-18; corollas 5 mm. long, the tube equaling the throat and 
limb together, the lobes ovate-lanceolate; achenes 4 mm. long, sparingly hirsute-strigose; pappus 
of 2-4 slender awns, 3-5 mm. long. 
TYPE LOCALITY: Jimulco, Durango. 
DISTRIBUTION: Type locality and vicinity. 
54. Pectis scabra Brand. Zoe 5: 226. 1905. 
A slender delicate annual; stem branching from the base, 1-1.5 dm. high, purple, scabrous- 
pubescent; leaves linear, 1-2 cm. long, 1-2 mm. wide, scabrous above, on the revolute margin 
and the midrib beneath, with 1 row of glands on each side of the midrib and 1 or 2 pairs 
of bristles at the base; heads on filiform peduncles from the upper axils; peduncles 2—4 
em. long; involucre turbinate, 3 mm. high and about as broad; bracts 6-8, linear, keeled 
below the middle, scarious-margined, with 5 or 6 glands, obtuse; ray-flowers 6-9; ligules linear, 
yellow, 2 mm. long; disk-flowers 10-15; corollas 2.5 mm. long; achenes slightly pubescent; 
pappus of 1-3 awns or bristles and as many small scales, the awns in the ray-flowers stouter 
than those of the disk. 
Tyre Locaiity: Cofradia, Sinaloa. 
DistrizutTion: Known only from the type locality. 
55. Pectis biaristata Rydberg, sp. nov. 
A low diffuse annual; stem less than 1 dm. high, branched from the base, minutely puberu- 
lent; leaves linear, 1-2 cm. long, 1 mm. wide, minutely puberulent above or glabrate, with 
1-3 pairs of small bristles near the base; heads peduncled, solitary at the ends of the branches 
and in the upper axils; peduncles 3-4 cm. long; involucre turbinate, 4-5 mm. high and nearly 
as broad; bracts about 8, round-carinate below, thin and flat above, acutish; glands in two 
lateral rows; ray-flowers 5-8; ligules elliptic, 5 mm. long, 2 mm. wide; disk-flowers 10-12; corollas 
