182 COMPOSITE. 



19. BACCHARIS, Linn. Dioecious shrubs or herbs, with striate or 

 angled branches, alternate simple, often glutinous leaves, and small 

 clustered discoid heads of white unisexual flowers. Involucre of scale- 

 like imbricated bracts. Fl. of staminate heads with tubular-funnelform 

 5 cleft corolla; of the pistillate slender-tubular, truncate or minutely 

 toothed. Style-appendages ovate to lanceolate, rarely coalescent. 

 Achenes 5 15-costate, glabrous or pubescent. Pappus of fertile flowers 

 very fine and soft, often becoming elongated in fruit. 



* Herbaceous perennial. 



1. B. Donglasii, DC. Erect, 3 4 ft. high, simple up to the terminal 

 corymb; leaves very glutinous, ovate-lanceolate, nearly or quite entire, 

 36 in. long: bracts of involucre erose-ciliate : pappus of pistillate fl 

 short, soft; of staminate clavellate and barbellate at summit. In moist 

 lowlands. Sept. Nov. 



* * Suffrutescent or shrubby. 



2. B. glntinosa, Pers. Shrub 612 ft. high: leaves lanceolate, acute, 

 entire, denticulate or repand- dentate, 2 3 in. long: heads in ample 

 cymose panicles at the ends of long willowy leafy branches. On banks 

 of streams, from Napa and Solano counties southward. May Dec. 



3. B. consaiigninea, DC. Compactly branching evergreen 812 ft. 

 high: branchlets green, angular from the leaf-bases: leaves subcoriaceous, 

 glutinous, 1 in. long and less, cuneate-obovate, coarsely toothed: heads 

 sessile singly or in pairs or threes in the leaf-axils: bracts of involucre 

 oblong-linear, obtuse, with subscarious fringed margins. Hillsides and 

 banks of streams everywhere. Oct. Dec. 



4. B. pilnlaris, DC. Low, slender, the depressed or prostrate diffusely 

 branching stems 1 2%/. long; branchlets angular: leaves seldom % in- 

 long, cuneate-obovate, angular- toothed or subentire, heads mostly solitary 

 in the leaf-axils and at the ends of the broom-like fastigiate branchlets: 

 involucral bracts acutish, fringed toward the tips. Sandy soils along 

 the seaboard and about San Francisco Bay. Aug. Oct. 



Suborder 3. G-NAPHALIACJE^:. 



Plants mostly white with floccose wool, the herbage apt to be more or 

 less pleasantly or unpleasantly scented. Heads discoid: bracts of invo- 

 lucre various, often scarious and white or yellowish. Anthers caudate. 

 Style-branches of perfect flowers blunt, unappendaged, the stigmatic lines 

 running almost to the summit, which is sometimes papillose or penieil- 

 late. Pappus finely capillary or none. 



