COMPOSITAE. 



VOL. III. 



4. Baccharis Wrightii A. Gray. Wright's 

 Baccharis. Fig. 4387. 



Baccharis Wrightii A. Gray, PI. Wright, i: 101. 1852. 



Herbaceous from a thick woody base, much 

 branched, glabrous, not glutinous, i-3 high, the 

 branches straight, nearly erect, slender, striate. 

 Leaves linear, sessile, i-nerved, entire, 3"- 12" long, 

 i"-i" wide; heads solitary at the ends of the 

 branches, 5 "-6" broad; involucre of the sterile 

 heads hemispheric, about 3" high, that of the fertile 

 ones somewhat campanulate and longer; bracts of 

 both involucres lanceolate, acuminate, with scarious 

 margins and a green back; pappus of the fertile 

 flowers of several series of tawny or purplish capil- 

 lary bristles. 



Western Kansas and Colorado to Tex? 3, Arizona and 

 Chihuahu'a. April-July. 



40. FILAGO Loefl.; L. Sp. PI. 927. 1753. 

 [EvAX Gaertn. Fr. & Sem. 2: 393. pi. 165. f. j. 1791.] 



White-woolly annual herbs, with alternate entire leaves, and small discoid clustered 

 heads, usually subtended by leafy bracts. Bracts of the involucre few and scarious. Recep- 

 tacle convex or elongated, chaffy, each chaffy scale subtending an achene. Outer flowers 

 of the heads in several series, pistillate, fertile, their corollas filiform, minutly 2-4-dentate. 

 Central flowers few, perfect, mainly sterile, their corollas tubular, 4-5-toothed. Anthers 

 sagittate at the base, the auricles acuminate. Achenes compressed or terete. Pappus none. 

 [Latin filum, a thread.] 



About 12 species, natives of temperate or warm regions of both the New World and the Old. 

 In addition to the following, 3 others occur in the western and southwestern United States. Type 

 species : Filago pygmaea L. 



i. Filago prolifera (Nutt.) Britton. Filago. 

 Fig. 4388. 



Evax prolifera Nutt. ; DC. Prodr. 5 : 459. 1836. 

 Diaperia prolifera Nutt. Trans. Am. Phil. Soc. (II) J: 



338. 1841. 

 Filago prolifera Britton, Mem. Torr. Club 5: 329. 1894. 



Stem simple, or branched at the base, very leafy, 

 2'-6' high. Leaves spatulate, obtuse, sessile, ascend- 

 ing or appressed, 4"-8" long, i"-2i" wide; heads in 

 a sessile leafy-bracted cluster, usually subtended by I 

 or several slender, nearly leafless branches, each ter- 

 minated by a similar cluster, or these again prolifer- 

 ous; heads oblong or fusiform; receptacle convex; 

 chaff of the central sterile flowers woolly-tipped, that 

 of the fertile flowers scarious, mostly glabrous. 



In dry soil, Texas to western Kansas and South Da- 

 kota, west to Colorado and New Mexico. April-July. 



41. GfFOLA Cass. Bull. Soc. Philom. 1819: 143. 1819. 

 [FILAGO L. Gen. PI. Ed. 5- 1758. Not Sp. PI. 927. 1753.] 



White-woolly herbs, closely resembling those of the preceding genus, with alternate, 

 entire leaves, and small discoid glomerate heads, often subtended by leafy bracts, the clusters 

 proliferous in our species. Involucre small, its bracts scarious, imbricated in several series, 

 the outer usually tomentose. Receptacle subulate, cylindric or obconic, chaffy, each chaffy 

 scale near its base enclosing an achene. Outermost flowers pistillate, fertile, with filiform 

 corollas and no pappus, or the pappus a few rudimentary bristles ; inner flowers also pistillate 

 and fertile, but with a pappus of capillary scabrous bristles; central* (uppermost) flowers few, 

 perfect, their corollas tubular, their pappus capillary and scabrous. Anthers sagittate at the 

 base. Achenes terete or slightly compressed. [Anagram of Filago.} 



About 10 species, natives of warm and temperate regions, the following typical. In addition to 

 the following, 3 Californian species are probably to be referred to this genus. 



