1012 FLORA. 



81. BOEBERA Willd. 

 [Dysodia Lag., not Cav.] 



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

 lar herbs, with opposite or alternate, mostly finely dissected haves, 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.] 



1. 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, 6-10 mm. broad; involucre campanulate, of 8-10 appressed, oblong, 

 >btuse, 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, and 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. 



1. Thymophylla aurea (A. Gray) Greene. Thyme-leaf. (I. F. f. 3980.) 

 Annual, glabrous, 1-3 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. 

 Ivans, 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 usuallv cymose heads of both tubular and radiate yellow flowers. Involucre 

 cylindric. oblong or campanulate, its bracts in 1 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. Anther? entire at the base. Style-branches of the disk-flowers very short, 

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

 scales, Blender bristles or awn-, sometimes with a few outer smaller additional ones. 

 [Latin, pntru. 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 17. S. 



1. Pectis angustifolia Torr. Lemon scented Pectis. (I. F. f. 3981.) 

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





