358 ASTERACEAE. 



naked. Anthers not caudate at base. Style-branches 

 stigmatic only below the middle. 



Achenes 5-angled. 1. Eupatorium. 



Achenes 10-ribbed. 2. Coleosanthus. 



1. EUPATORIUM L. 



Erect mostly branching perennial herbs, with opposite 

 verticillate or alternate often punctate leaves, and 

 cymose-paniculate discoid heads of white, blue or purple 

 flowers. Involucre oblong to hemispheric, its bracts im- 

 bricated in 2-several series. Receptacle flat, convex or 

 conic, naked. Corolla regular, its lobes slender, 5-lobed 

 or 5-toothed. Style-branches flattened above, stigmatic 

 at the base. Achenes 5-angled, truncate. Pappus of 

 numerous capillary usually scabrous bristles, arranged 

 in a single row. 



1. E. glandulosum H. B. K. Stems slender and apparently her- 

 baceous, glandular-puberulent; upper leaves opposite, short-petioled, 

 ovate-deltoid, acute at apex, cordate at base, serrate, thin, minutely 

 atomiferous beneath; cymes rather compact, on dichotomous 

 peduncles longer than the leaves; pedicels 1 cm. long, with 2-3 linear 

 bracts; heads 20-30-flowered; involucral bracts lanceolate, firm, 

 4 mm. long, prominently 2-ribbed, the acute tips softer; corolla 4-5 

 mm. long, glabrous, white, the filiform tube twice the length of the 

 abruptly expanded throat; pappus scabrous, equaling the corolla, 

 early deciduous; achenes smooth, 5-angled, slightly arcuate, 1.5 mm. 

 long; receptacle somewhat rounded. (E. pasadense Parish.) 



Wet bank of a pool in a canyon south of Pasadena, McClatchie. 



2. COLEOSANTHUS Cass. 



Herbaceous perennial or partly shrubby plants, with 

 opposite or alternate leaves and discoid heads of whitish 

 or pink flowers in panicles or cymes. Involucral bracts 

 well-imbricated in several series, striate. Receptacle 

 flat or convex. Achenes 10-striate or -ribbed. Pappus 

 a single row of numerous rough or serrate bristles. 



I.e. califomicus (T. & G.) Kuntze. Shrubby at base, 6-9 dm. 

 high, paniculately branched; herbage somewhat glandular-puberu- 

 lent; leaves alternate, ovate, somewhat triangular or slightly cordate, 

 obtuse, irregularly crenate-toothed, 3-ribbed from the base, veiny, 

 roughish, 2-4 cm. long, short-petioled; heads spicate or racemose 

 along leafy branches, about 1 cm. high, 10-15-flowered; involucral 

 bracts with thinnish, mostly obtuse straight tips. {Brickellia 

 calif ornica Gray.) 



Occasional in the canyons of the San Gabriel and Santa Ana 

 Mountains. 



