198 NORTH AMERICAN FLORA [VoLuME 34 
2. Pectis prostrata Cav. Ic. 4: 12. 1797. 
Chthonia prostrata Cass.; DC. Prodr. 5: 100, as synonym. 1836. 
Pectis costata Ser. & Merc.; DC. Prodr. 5: 100. 1836. 
A diffuse annual; stem branched at the base; branches 4-20 cm. long, decumbent or 
prostrate, short-pilose in decurrent lines; leaves oblanceolate-linear, entire, 1-3 cm. long, 2—4.5 
mm. wide, acute, often mucronate, ciliate with 5—9 pairs of bristles below, with many distinct, 
scattered glands; heads axillary and terminal, the lower solitary, the upper in 2-9-cephalous 
glomerules; peduncles 0-5 mm. long; involucre oblong, 5-6 mm. high, 2.5-3 mm. broad; 
bracts 5, oblong or linear-oblong, rounded or truncate at the apex, with a thick rounded keel 
extending to the apex; glands several, oblong, near the apex; ray-flowers 5; ligules oblong, 3 
mm. long; disk-flowers 4-15; corollas 2-2.5 mm. long; achenes 3-4 mm. long, short-pubes- 
cent; squamellae of the ray-flowers 2, narrowly lanceolate, and 1-3 smaller bristles; those 
of the disk-flowers 5, unequal. 
TYPE LOCALITY: Mexico. 
DistrrBution: New Mexico and Arizona to Colombia and Venezuela; Florida, Cuba, and 
Jamaica. 
ILLUSTRATION: Cav. Ic. pl. 324. 
3. Pectis multisetosa Rydberg, sp. nov. 
A diffuse annual; stem branched at the base, prostrate, 1 dm. long or less, pilose on two 
decurrent lines; leaves linear-oblanceolate, 1-2 cm. long, 2-3 mm. wide, short-acuminate, 
setose-ciliate to near the apex; glands conspicuous, numerous, irregularly scattered; heads 
mostly glomerate at the ends of the branches, sessile; involucre about 5 mm. high, 2 mm. 
broad; bracts 5, linear-oblong, obtuse, bluntly keeled to near the apex; ray-flowers 5; ligules 
1.5 mm. long; disk-flowers 4 or 5; corollas 2~2.5 mm. long; achenes 3 mm. long, sparingly hirsute; 
squamellae of the disk-flowers 5, of the rays 2, linear-lanceolate, aristate-acuminate, 1.5—2 
mm. long. 
Type collected at Chupadero, Santa Rosa, Guatemala, 1892, Heyde & Lux [J. D. Smith distrib. 
no.] 4232 (herb. Columbia Univ.). 
4. Pectis cylindrica (Fernald) Rydberg, sp. nov. 
Pectis prostrata cylindrica Fernald, Proc. Am. Acad. 33: 68. 1897. 
A diffuse annual; stem branched at the base, decumbent or ascending; branches 1-3 dm. 
long, pilose on decurrent lines; leaves linear, 1.5—3 cm. long, about 3 mm. wide, entire, obtuse 
or rounded at the apex, ciliate at the base with 2-5 pairs of bristles; glands numerous, small, 
scattered; heads axillary, mostly solitary, subsessile; involucre cylindric, 9 mm. high, 2-3 
mm. broad; bracts 3, thin, striate, slightly round-keeled to near the rounded or retuse apex; 
glands few, scattered; ray-flowers 3; ligules oblong, 2 mm. long; disk-flowers 4-6; corollas 2 
mm. long; achenes 4.5 mm. long, hirsute; squamellae 4-6, unequal, narrowly lanceolate, 
acuminate into a short awn. 
TYPE LocaLity: Arizona. 
DistRiBsutIoN: New Mexico, Arizona, and Sonora. 
5. Pectis tenuicaulis Urban, Symb. Ant. 1: 468. 1900. 
Pectis prostrata Griseb. Fl. Brit. W. Ind. 378, in part. 1861. Not P. prostrata Cav. 1797. 
A diffuse annual; stem prostrate, branched at the base, 3-15 cm. long, dichotomously 
branched, short-pilose on two decurrent lines; leaves oblong-oblanceolate or gblong-linear, 
5-15 mm. long, 1.5~3.5 mm. wide, obtuse, mucronate or apiculate at the apex, with 3-5 
pairs of bristles near the base; glands rather few, irregularly scattered; heads solitary in the 
forks, or 2—5 in small clusters at the ends, sessile or short-peduncled; peduncles 2 mm. long or 
less; involucre 4-5 mm. high, 1.5-2 mm. broad; bracts 3, obovate-oblong, obtuse or truncate, 
with thick obtuse keel to near the apex; glands few, mostly near the apex; ray-flowers 3; 
ligules nearly 3 mm. long; disk-flowers 4 or 5; corollas about 2 mm. long; achenes scarcely 3 
mm. long, short-pilose; squamellae of the disk-flowers 3-5, of the ray-flowers 2, unequal, lan- 
ceolate, setaceous-acuminate, scarcely 1.5 min. long. 
TyPE Locatity: Near Pefiuela, Porto Rico. 
DISTRIBUTION: Porto Rico, Antigua, and Martinique. 
