'38 



FIELD COLUMBIAN MUSEUM BOTANY, VOL. III. 



peduncles naked, slender, sulcate, glabrous. Heads resin dotted, 8-10 

 mm. high, 30 mm. broad; disk depressed globose; ray flowers 6-8, 

 fertile, disk flowers numerous. 

 Involucral bracts soon reflexed, 

 in 2 series, the outer twice the 

 length of the inner, linear, acute, 

 punctate like the leaves and 

 bearing on the inner surface of 

 the slightly broadened base a 

 prominent thick gland; inner 

 submembranaceous, oblanceo- 

 late, acuminate, erose-denticu- 

 late, a gland less prominent than 

 those of the outer bracts on the 

 inner surface at the broadest 

 part. Ray corollas yellow, tube 

 very short, ligule cuneate, 3 

 lobed, 1 2-14 mm. long, pubescent 

 beneath, spreading or drooping 

 with a tendency to twist; disk corollas 5 lobed. Receptacle hemi- 

 spheric. Achene brown, .9x1.4-1.5 mm., turbinate-obconoid, apex 

 truncate in section hexagonal, the angles rounded the facets slightly 

 concave, a minute intermediate angle in the center of each; densely 

 clothed on the main angles with long, stiff, ascending, tawny hairs; 

 pappus of 6-7 long-aristate, obovate scales, 2-2.5 mm. long. 

 Hab. Fields near Uman, 1887, Millspaugh 23. 



Helenium quadridentatum Labill. Act. Soc. Hist. Nat. Par., 1 122. 



An erect, branching annual or biennial with sulcate or wing- 

 angled, glabrous stems and branches, and alternate, long-decurrent, 

 glabrous, punctate leaves, the lower incisely pinnatifid, the upper 

 lanceolate, entire. Inflorescence loosely paniculate, peduncles sul- 

 cate, minutely puberulent, the summit 

 clavate. Heads 10-12 mm. high, 15-20 

 mm. broad, disk globose-ovoid; ray 

 flowers about 10, disk flowers nu- 

 merous. Involucral bracts soon re- 

 flexed, in 2 series, the outer 2-3 times 

 the length of the inner, linear, acute, 

 pubescent; inner hyaline, linear, acute, 

 pubescent at the summit. Ray corol- 

 las yellow, tube very short, ligule 

 cuneate, 3 lobed, 7-8 mm. long, mi- 

 nutely pubescent and resin dotted 

 beneath, drooping; disk corollas 4 

 lobed. Receptacle oblong-ovoid. 

 Achene reddish brown, -5X.7 mm., 

 turbinate, base broad, apex truncate; 



in section orbicular, obscurely 10 angled; the 10 ribs villous, the inter- 

 nerves sparingly so; pappus of 4-6 roundish-oval, ecostate, erose- 

 dentate scales, .3 mm. long. 



