1012 FLORA. 







81. BOEBERA Willd. 

 [DvsdoiA Lag., not Cav.] 



Erect or diffuse, branching, mostly annual, strong-scented more or less glandu- 

 lar herbs, with opposite or alternate, mostly finely dissected leaves, and small 

 peduncled heads of both tubular and radiate yellow flowers. Involucre cylindric, 

 campanulate or nearly hemispheric, its bracts in I series, united into a cup, usually 

 with a few small additional outer ones. Receptacle flat, pubescent, or covered 

 with short bristles. Ray-flowers pistillate, the rays short. Disk-flowers perfect, 

 their corollas 5 -toothed. Anthers entire or minutely 2 -toothed at the base. Style- 

 branches of the disk-flowers elongated, hirsute, sometimes apiculate. Achenes 

 narrowly obpyramidal, 3~5-angled, striate. Pappus of about 10 scales, parted to 

 beyond the middle into numerous capillary, rather stiff, bristle-like segments. 

 [Named for J. von Boeber, a Russian botanist.] 



i. Boebera papposa (Vent.) Rydb. FETID MARIGOLD. FALSE DOG- 

 FENNEL. (I. F. f. 3979.) Annual, very leafy, glabrous or finely pubescent, gland- 

 dotted, much branched, 15-45 cm. high, the branches diffuse or erect. Leaves 

 opposite, sessile, or short-petioled, 1-4 cm. long, pinnately parted into linear or 

 slightly spatulate, sharply serrate or incised segments; heads numerous, short- 

 peduncled, 6-IO mm. broad; involucre campanulate, of 8 10 appressed, oblong, 

 obtuse, green or purplish, glabrous or ciliate bracts, with several narrow shorter 

 outer ones; rays few, not longer than the width of the disk; receptacle and achenes 

 pubescent. Along streams and roadsides, Ohio to Minn, and Neb., south to La., 

 Mex. and Ariz. Occasionally found as a weed in waste places in the Eastern and 

 Middle States, and in Ont. July-Oct. \Dysodia papposa (Vent.) A. S. Hitchc. 



82. THYMOPHYLLA Lag. 



Annual or perennial herbs, some species low undershrubs, with gland-dotted 

 foliage and involucre, alternate or opposite leaves, arid small heads of both tubular 

 and radiate, mostly yellow flowers. Involucre campanulate, its principal bracts 

 united into a cup, sometimes with smaller outer ones. Receptacle naked, or fim- 

 brillate, not chaffy. Ray-flowers pistillate, fertile, Disk-flowers perfect, fertile. 

 Style-branches truncate or blunt. Achenes striate. Pappus of several or numer- 

 ous scales or bristles. [Greek, thyme-leaf, not applicable to the following species.] 

 About 15 species, natives of America. Besides the following, some 4 others occur 

 in the western parts of the U. S. 



I. Thymophylla aurea (A. Gray) Greene. THYME-LEAF. (I. F. f. 3980.) 

 Annual, glabrous, 13 dm. high, much branched; the leaves and involucre with 

 large oval oil-glands. Leaves alternate, or the lower opposite sessile or nearly 

 so, very deeply parted into 5-9 linear-filiform, mostly entire, blunt segments; 

 heads numerous, corymbose, 12-20 mm. broad, terminating the branches; invo- 

 lucre about 6 mm. high, its bracts acute; rays about 12, 5-6 mm. long; pappus of 

 6-8 erose truncate scales, somewhat longer than the thickness of the achene. 

 Kans. and Colo, to Tex. June-Sept. 



83. PECTIS L. 



Annual or perennial, diffuse prostrate or erect, mostly glabrous herbs, gland- 

 dotted and strong-scented, with opposite narrow sometimes ciliate leaves, and 

 small usually cymose heads of both tubular and radiate yellow flowers. Involucre 

 cylindric, oblong or campanulate, its bracts in I series, narrow, keeled, distinct. 

 Receptacle small, naked. Ray-flowers pistillate, the rays small, entire or 3-lobed. 

 Disk-flowers perfect, their corollas with expanded, somewhat irregularly 5 -cleft 

 limbs. Anthers entire at the base. Style-branches of the disk-flowers very short, 

 obtuse. Achenes linear, slightly angled, striate. Pappus of several or numerous 

 scales, slender bristles or awns, sometimes with a few outer smaller additional ones. 

 [Latin, pert en, comb, referring to the pappus.] About 50 species, natives of the 

 warmer parts of America. Besides the following, about 10 others occur in the 

 southern and western U. S. 



i. Pectis angustifdlia Torr. LEMON-SCENTED PECTIS. (I. F. f. 3981.) 

 Annual, much branched, 1-3 dm. high, the branches diffuse or ascending. Leaves 



