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 apwua, aroma; in allusion to the agree- 
able and powerful odour of the plant.) 
Aromia * tenuifoha. 
Has. Near the coast of St. Diego, Upper California. Smooth, but glutinous above, bitter to 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 eirobus; two to 
three inches long.—Although artificially placed in this section, the present plant presents no 
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 oe 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 tefininal segments trifid; branches one- 
flowered. Involucrum with all the sepals scariose; disk conic, elevated 
~ above the involucrum. Allied to Pyrethrum by the alated tube of the discal 
florets, but distinct in other respects. —(The name alludes to the scaly ap- 
pearance of the involucrum. ) 
