210 NORTH AMERICAN FLORA [VOLUME 34 
the upper axils, 2-3 cm. long; heads nodding at first; involucre about 4 mm. high and 2.5 mm. 
broad; bracts 5, lanceolate, acuminate, bearing a few glands on the thickened midrib; ray- 
flowers 5; ligules greenish-white, slightly tinged with purple, oblong, 1 mm. long; disk-flowers 
3 or 4; corollas whitish; achenes fully 2 mm. long, linear-oblanceolate, sparsely pubescent or 
glabrate; pappus of 15 unequal rufescent scabrous bristles, dilated below, 1-2 mm. long. 
Type Loca.ity: [Sercania, near] Maxcanti, Yucatan. 
DISTRIBUTION: Known only from the type locality. 
ILLUSTRATION: Field Columb. Mus. Publ. Bot. 3: fl. opp. 143. 
49. Pectis elongata H. B. K. Nov. Gen. & Sp. 4: 262. 1820. 
Pectis stricta Willd.; Less. Linnaea 6: 710, assynonym. 1831. 
Lorentea polycephala Gardn. Lond. Jour. Bot. 5: 240. 1846. 
Pectis floribunda A. Rich. in Sagra, Hist. Cuba 11: 36. 1850. 
Pectis ciliaris A. Rich. in Sagra, Hist. Cuba 11: 36. 1850. 
Pectis Plumieri Griseb. Fl. Brit. W. Ind. 378, in part. 1861. 
Cryptopetalon elongatum Cass.; Urban, Symb. Ant. 5: 283, assynonym. 1907. 
An erect annual; stem 1.5—7.5 dm. high, more or less angled, scabrous under the nodes, 
with numerous spreading or ascending branches; leaves linear, 2-6 cm. long, 1.5-3 mm. wide, 
mucronate or bristle-tipped, with 3-10 pairs of bristles near the base; glands many, in 4-6 
irregular rows; heads cymose-paniculate; peduncles slender, 0.5—-2 cm. long; involucre 5-6 
mm. high, 4-5 mm. broad, turbinate; bracts 5, purplish, linear, acuminate, obtusely keeled 
at the base, glabrous; ray-flowers 5; ligules 2.5—-3 mm. long, yellow, tinged with purple; disk- 
flowers 5-7; corollas about 2.5 mm. long; achenes 2—2.5 mm. long, hirsutulous on the angles or 
glabrate; pappus-bristles of the disk-flowers 8-24, of the ray-flowers 5-20, capillary, sca- 
brous, the longer 4 mm. long. 
TYPE LOCALITY: Popayan, Colombia. 
DisTRIBUTION: Cuba, Jamaica, and Hispaniola; Yucatan and Guatemala to Guiana and Peru. 
ILLUSTRATION: H. B. K. Nov. Gen. & Sp. pl. 392. 
50. Pectis papposa Harv. & Gray; A. Gray, Mem. Am. Acad. II. 
4: 62. 1849. 
Pectis tenella Rothr. Bot. Wheeler’s Surv. 171. 1878. Not P. tenella DC. 1836. 
Pectis Palmeri S. Wats. Proc. Am. Acad. 24: 58,in part. 1889. 
A slender yellowish-green annual; stem dichotomous, with more or less spreading branches, 
1-3 dm. high; leaves fleshy, filiform, 1-6 cm. long, 1-2 mm. wide, with 2-5 pairs of bristles 
near the base; glands conspicuous, marginal; heads in leafy cymes, subfastigiate; peduncles 
1-3 em. long; involucre turbinate, 4.5-6 mm. high, 3-5 mm. broad; bracts 7—9, narrowly 
linear, strongly involute, strongly round-keeled and gibbous at the base, obtuse, with 3-7 
conspicuous glands; ray-flowers 7—9; ligules 4-6 mm. long, 1.5-2 mm. wide; disk-flowers 10— 
15; corollas 4-5 mm. long, the lobes lanceolate; achenes 4-5 mm. long, hispidulous or strigose; 
pappus of the disk-flowers of 12-20 short-plumose bristles, about 4 mm. long, or rarely reduced 
to a crown; that of the ray-flowers a short oblique crown of united squamellae, one or two of 
which are rarely produced into an awn. 
TYPE LocaLity: California. 
DIsTRIBUTION: New Mexico to California, Lower California, and Sonora. 
51. Pectis angustifolia Torr. Ann. Lyc. N. Y. 2: 214. 1827. 
Helioreas angustifolius Raf. Atl. Jour. 145. 1832. 
Pectidiopsis angustifolia DC. Prodr. 5: 98. 1836. 
Pectis fastigiata A. Gray, Mem. Am. Acad. II. 4: 62. 1849. 
Pectis angustifolia subaristata A. Gray, Pl. Wright. 1: 82. 1852. 
Pectis papposa sessilis M. E. Jones, Contr. West. Bot. 12: 46. 1908. 
A diffuse dichotomously branched annual; stem 1-2 dm. high, glabrous, slightly angled; 
leaves 1-4 cm. long, 1-1.5 (rarely 2) mm. wide, glabrous, fleshy, with (especially the upper) 
more or less dilated and scarious margins below, pectinately lobed into 3-5 pairs of lanceolate 
or subulate bristle-tipped lobes; glands conspicuous, marginal; heads fastigiate at the ends of 
the branches; involucre turbinate, 4-5 mm. high and about as broad; bracts 8-10, narrowly 
linear, strongly involute and round-ribbed, gibbous at the base, with a conspicuous apical 
