160 PROCEEDINGS OF THE AMERICAN ACADEMY 



although they include not the root or base, seem to be herbaceous. I 

 cannot doubt that the plant is a true congener of Solidago (^Euthamid) 

 tenuifolia and lanceolata, of which it has the habit (though more loosely 

 branched), involucre, flowers, stigmas, &c. Only the flowers are fewer, 

 and therefore also the fimbrillfe of the receptacle, which are more elon- 

 gated, chaffy, and combined in the centre of the receptacle. Com- 

 monly, however, all the flowers are hermaphrodite and tubular, but one 

 or two of the marginal ones are becoming liguliform and their stamens 

 abortive. This adds another to the many intricate transitions among 

 the Chrysocomeous genera which I have had occasion to notice. If, 

 in any revision, Euthamia is adopted as a genus, it may well embrace 

 Bigehvia of De Candolle. 



50. APLOPArpus ARENARius, Bcnth. Bot. Voy. Sulph. p. 24. Fo- 

 lia ramealia oblonga vel lanceolata, caulina (prajsertim inferiora) spathu- 

 lata, magis inciso-dentata quam undulata (dentibus mucrone cuspida- 

 tis), ima nunc lyrato-subpinnatifida, majora poUicaria vel paullo longi- 

 ora. — Mr. Bentham's specimens were probably older, and wanted 

 the lower cauline leaves. In ours the stems are nearly or quite her- 

 baceous. 



51. Baccharis c^rulescens, DC. Prodr. 5, p. 402. Same as the 

 Northern Mexican plant. 



52. Baccharis viminea, DC. Prodr. 5, p. 400? This accords 

 with what was named B. Douglasii in Whipple's Pacif R. R. Explora- 

 tion, and with specimens gathered in California by Fremont in 1845. 

 Although allied to B. Douglasii, it is not the same, but I believe is De 

 CandoUe's B. viminea. The heads are larger and looser tlian those of 

 B. Douglasii ; the scales of the involucre broader, the outermost ovate, 

 the innermost oval-lanceolate, smooth, and more scarious. The speci- 

 mens of Xantus all have the heads diseased or monstrous, probably by 

 the puncture of insects. 



53. Pldchea subdecurrens, DC. ? var. parvifolia. Folia ses- 

 quipoUicaria vel breviora, 2^-3 lin. lata, fere ad basin usque argute 

 serrulata, basi in alas lineares decurrentia. — This is quite different 

 from Hartweg's no. 112, and probably really belongs to P. subdecur- 

 rens. 



54. Franseria ambrosioides, Cav. Ic. 2, p. 79, t. 200. 



55. Franseria tenuifolia, var. tripinnatifida. Gray, PI. Lindh. 

 2, p. 227, & PI. Wright. 1, p. 104. Ambrosia fruticosa (excl. /3.) 

 and A. confertijlora, DC. Canescent forms. 



