504 COMPOSITAE. Vor. III. 
77. PSILOSTROPHE DC. Prodr. 7: 261. 1838. 
[Rippettia Nutt. Trans. Am. Phil. Soc. (II) 7: 271. 1841.] 
Branched annual or perennial woolly herbs, often nearly glabrous when old, with alter- 
nate leaves, and middle-sized heads of both tubular and radiate yellow or orange flowers, 
corymbose, or clustered at the ends of the branches. Involucre cylindraceous, its bracts 4-10 
in I series, narrow, equal, densely white-woolly, separate, but erect and connivent, commonly 
with 1-4 scarious ones within, and occasionally a narrow outer one. Rays broad, becoming 
papery and whitish, persistent, 5-7-nerved, 2-3-toothed, pistillate. Receptacle small, naked. 
Disk-flowers perfect, fertile, their corollas with a short proper tube and elongated cylindra- 
ceous limb, 5-toothed, the teeth glandular-bearded. Anthers obtuse and entire at the base. 
Style-branches of the disk-flowers capitellate. Achenes linear, striate. Pappus of 4-6 nerve- 
less acute scales, glabrous or villous. [Greek, referring to the naked receptacle.] 
About 7 species, natives of the southwestern United States and northern Mexico. Type species: 
Psilostrophe gnaphalddes DC. 
1. Psilostrophe villosa Rydb. Plains Psilo- 
strophe. Fig. 4527. 
P. villosa Rydb.; Britton, Manual 1006. 1901. 
Perennial, branched, 6’-2° high, loosely white- 
woolly. Basal and lower leaves spatulate, entire, den- 
tate or rarely pinnatifid, mostly obtuse, 2-4’ long; 
upper leaves sessile, or nearly so, smaller, linear to 
spatulate, usually entire; heads several together in 
the clusters, 4-6” broad, short-peduncled; rays few, 
lemon-yellow, commonly as wide as long, with 2 or 
3 broad teeth or lobes at the summit; achenes gla- 
brous, or sparingly pubescent; pappus scales linear- 
lanceolate to oblong-lanceolate, glabrous, shorter 
than the disk-corollas. 
In dry sandy soil, Kansas to Texas and Arizona. In- 
cluded, in our first edition, in P. Tagetinae (Nutt.) 
Kuntze, which has much larger yellow rays. June-Sept. 
78. FLAVERIA Juss.; Gmelin, Syst. 1269. 1791. 
Glabrous or minutely puberulent, light-green, mostly annual herbs, with opposite sessile 
entire or serrate leaves, and small 1-several-flowered, usually sessile, oblong and densely 
cymose-capitate heads of tubular, or both tubular and radiate yellow or yellowish flowers. 
Involucre of 2-5 narrow, nearly equal, appressed bracts, sometimes with 1 or 2 additional 
small exterior ones. Receptacle small, naked or setose. Ray-flower commonly only 1, pistil- 
late, fertile, sometimes wanting. Disk-flowers I-15, perfect, fertile, their corollas 5-toothed. 
Anthers entire at the base. Style-branches of the disk-flowers truncate. Achenes oblong or 
linear-oblong, 8-10-ribbed. Pappus none. [Latin, flavus, yellow, from its dyeing properties.] 
About 7 species, natives of the warmer parts of America. In addition to the following, 3 others 
occur in the southern United States. Type species: Flaveria chilensis Gmelin. 
1. Flaveria campestris Johnston. Plains Fla- 
veria. Fig. 4528. 
Flaveria campestris Johnston, Proc. Am. Acad. 39: 287. 
1903. 
Annual, glabrous, erect, 1°-2° high, little branched. 
Leaves linear or lanceolate, serrulate or entire, 3-nerved, 
acuminate or acute at the apex, sessile by a broad and 
somewhat clasping base, 1’-23’ long, 2’-4” wide; heads | 
about 3” high, closely sessile in terminal glomerules or 
these pedunculate from the upper axils; involucre of 3 
oblong-lanceolate bracts, 2-5-flowered; ray equalling or 
longer than the breadth of the disk; achenes linear, gla- 
brous, about 14” long. 
In alkaline soil, Missouri to Colorado, Texas and Mexico. 
Aug.-Oct. In our first edition included in the Mexican F. 
angustifolia (Cav.) Pers. : 
