250 COMPOSITE. Pentach^ta. 



certainly that of Asteroidefe, although the appendages are unusually narrow 

 and prolonged. 



Subdiv. 4. Heterothece^, DC. — Rays in a single series. Pappus of the 

 disk and ray dissimilar. 



53. BRADBURIA. Torr. Sf Gray; not of Raf. 



Heads many-flowered ; the ray-flowers ligulate, pistillate, fertile, in a sin- 

 gle series; those of the disk perfect but infertile. Involucre hemispherical- 

 campanulate ; the scales oblong-lanceolate, mucronate, membranaceous, 

 shining, with broad scarious margins, imbricated in 3 or 4 series, appressed. 

 Receptacle flat, areolate, nearly naked. Corolla of the ray linear, twice the 

 length of the involucre ; of the disk tubular, slender, 5-toothed, about the 

 lenf^th of the involucre. Branches of the style in the ray-flowers included in 

 the tube of the corolla, narrowly linear, glabrous, stigmatose to the summit; 

 in the disk filiform, elongated, barbellate throughout. Achenia of the ray 

 short, triangular, turgid, villous ; of the disk very short, villous, rudimentary. 

 Pappus of the ray double ; the exterior of few unequal short squamellate 

 bristles; the interior of numerous rather rigid barbellate-scabrous capillary 

 bristles, somewhat longer than the achenium : pappus of the disk of 2 awn- 

 like bristles, nearly the length of the corolla, somewhat dilated and chaffy 

 towards the base. — An annual herb, sparsely hispid with rigid spreading 

 hairs, and glandular-scabrous, with numerous slender and elongated branches. 

 Leaves linear, very narrow, short, entire, involute when dry; the uppermost 

 setaceous. Heads solitary, terminating the branchlets. Flowers apparently 

 yellow. 



B. liirlella. 



Texas, Drummond! — Stem about 2 feet high, somewhat corymbosely 

 branched. Leaves rather rigid, numerous, the lower ones about an inch long, 

 apiculate, sparsely hispid, like the stem, with long bristly hairs arising from 

 a rigid somewhat dilated base, and minutely glandular-scabrous. Heads 

 pedunculate, as large as in Chrysopsis graminifolia. Involucre at length 

 spreading ; the scales nearly glabrous, shining, remarkably membranaceous, 

 1-nerved. Ray-flowers about 12 ; the achenia slightly obovate, 3-sided, 

 rather large. Pappus of the disk-flowers of 2 (very rarely one) bristles or 

 awns resembling those of Ageratum conyzoides: in one of them the chaffy 

 base is occasionally wanting. — We are not sure that the ray is yellow : if it 

 prove otherwise, the plant would belong to De Candolle's division Asterese, 

 subdivision Heteropappes. The style is nearly the same with that of Ver- 

 noniacffi. We dedicate this remarkable genus to the memory of John Brad- 

 bury, who in the year 1811 ascended the Missouri to the Mandan villages, 

 and made an interesting collection of plants, &c., a portion of which were 

 published by Pursh in the supplement to his Flora. " In 1817, he pub- 

 lished in London a journal of his travels in America during the years 1809- 

 11, in which is contained a great deal of interesting information on the bota- 

 ny' of the Missouri country/' {Short, on Western Botany.) This work we 

 have never met with. — Bradhurya of Rafinesque's Flurula Ludoviciana, is 

 founded on Robins' description of two species of Glycine, one of which ap- 

 pears to be Centrosema Virginiana, the other perhaps a Galactia. 



