396 DESCRIPTIONS OF NEW SPECIES 



partly four-sided. Pappus paleaceous, formed of a small crown of twelve^ 

 or more, linear, obtuse segments, partly united at base. — A very aromatic 

 annual or biennial plant of Upper California, branching from the base; leaves 

 alternate, ternately dissected, the segments almost filiform. Flowers corym- 

 bose, yellow, without any projecting rays. Upper part of the plant glutinous 

 and aromatic, the scent something like that of the officinal Chamomile, but 

 more agreeable. — (The name from apw/ua, aroma; in allusion to the agree- 

 able and powerful odour of the plant. ) 



Aromia *tenuifoKa. 



Hab. Near the coast of St. Diego, Upper California. Smooth, but ghitinoxis abote, bitter tc the 

 taste; when luxuriant, branching from the base, at other times more towards the summit, stems 

 and branches fastigiate. Leaves filiformly linear, rather long petiolate, mostly trifid at the summit, 

 some partly pseudopinnate, with a few shorter segments than the terminal ones; uppermost leaves 

 entire. Capituli numerous, small and inconspicuous, yellow, rather less in bulk than a grain of 

 black pepper, roundish-obovate, or narrower at the base, nearly sessile; corymb trichotomous. 

 Rays, or feminine florets minute, not at all exserted, and scarcely distinguishable from the discal 

 florets, but by the projecting stigmas. Receptacle narrow. Discal florets ten to twelve. Pappus 

 about a third the length of the achenium, which is about a line long. Flowering in the month of 

 May. Stem six to ten inches high. Leaflets about as narrow as those of Pinus strohus, two ta 

 three inches long. — Although artificially placed in this section, the present plant presents na 

 affinity with any genus included in it. 



*LEPIDANTHUS. 



Capitulum homogamous; florets tubular, minute, three to four, rarely five- 

 toothed, the tube alated. Receptacle naked, acutely conic, higher than the 

 involucrum. Involucrum hemispherical, biserial ; sepals oval, obtuse, broadly 

 scariose, and nearly equal. Stigmas exserted, short, filiform, obtuse. Ache- 

 nium naked, subquadrangular, flattened at the summit, with a large epigy- 

 nous disk. — A somewhat decumbent, much-branched annual, with alternate, 

 pseudobipinnate, linear leaves, the terminal segments trifid; branches one- 

 flowered. Involucrum with all the sepals scariose; disk conic, elevated 

 above the involucrum. Allied to Pyreihrum by the alated tube of the discal 

 florets, but distinct in other respects. — (The name alludes to the scaly ap- 

 pearance of the involucrum.) 



