SYNGENESIA. SUrEKFLUA, l65 



5^1. *BRAClIYRIS.t 



ra/fxcjlindric-ovate, closely imbricate, scales 

 aj^glutinated. Jiadial florets about 5; dlscal 

 florets also 5. Beceyiade naked. Pajjpus short 

 and paleaceous, leaflets 5 to 8, persistent. 



Vegetation almost exactly similar to that of Exithamia 

 tcnui folia. 



B. EiithamU. SoUda^o Saroih\t. Ph. 2. p. 540. 



Ods. Perennia]. Stems numerous, marginately ang-ular 

 and scabrous, 6 to 12 inches liigb, fastitriately branched 

 and corymbose, l.eavcs proximate, narrow linear, entire, 

 punctate, and scabrous on the margin; branchlets dicho- 

 lomous. Flowers terminal, often glomerated by 3s, smail^ 

 and vellow. Scales of the calix subcarinate, partly acute, 

 witl/grecjiish fuliaceous points, resinosely glutinous. Rays 

 5, entire, nearly as long as the calix. Discal florets the 

 same number, 'tubular, 5-toothed. Seed somewhat in- 

 versely conic, pubescent; pappus paleaceous, about the 

 length of the seed, 5 to 8-parted, leaflets unequal, linear 

 and subacute. Hab. On the arid hills of the Missouri, 

 ii-om the Arikarees to the Mountains? The whole plant 

 possesses a strong balsamic but disagreeable scent, and 

 is used medicinally by the aborigines, operating power- 

 fully as a diuretic. 



562. DONIA. R, Brown. 



Calix hemispherical, imbricated, squarrose 

 and glutinous. Radial florets numerous, (30 to 

 35, yellow). Receptacle naked, scrobiculate. 

 Pappis setaceous, setse 3 or 4, deciduous, some- 

 what paleaceous. 



SuflTruticose, or biennial; leaves serrated, resinosely 

 punctate; flowers terminal, fasligiate. Seeds obovate, 

 smooth. 



Species. 1. D. squarrosa. Ph. Obs. Biemiial or suf- 

 fruticose. Stem 3 or 4 feet high, erect or spreading, 

 white or purplish; branches fastigiate, few-flowered, ra- 

 muli l-flowered. Radical leaves spathulate-obo\ate, ob- 

 tuse, stem leaves oblong, acute, serrate, amplexicaule, 

 smooth and reticulately veined, glandularly punctate. 



t From ^^^'/.^^^ ^hort, and ^Pi^f o") « Qhajfij scale; the pap- 

 pus being short apd paleaceous. 



