172 MR. NUTTALL’S DESCRIPTIONS OF NEW 
the achenium.* Achenium oblanceolate, and compressed, sericeous villous, with only 
two marginal lines. Receptacle conspicuous, with alveolar margins. 
In the present genus the involucrum is imbricated distinctly, in three to five series 
of subearinated scales, the lowest very small. The florets few in number, have a 
short, five-cleft border. The processes of the style are long and subulate, much 
exceeding the lower, naked portion. Pappus slender, much less copious, and not so 
scabrous as in the preceding; more than double the length of the achenium. 
Achenium somewhat cylindric, smooth, about five lined. Receptacle very small and 
smooth. 
*OXYTENIA.+ 
Capitulum heterogamous, many-flowered, the marginal ones in a single series, 
apetalous and feminine.. Florets of the disk tubular, masculine. Involucrum 
composed of a single series of imbricated, ovate, rather rigid scales, (about five.) 
Receptaculum small and flat; its palea narrow, spathulate and membranaceous, tufted 
with long hairs. Mae Fiowers.—Corolla obconic, with a narrow tube ; border 
five-toothed. Anthers distinct. Frmate.—Corolla none. Stigmata terete, filiform, 
smooth. Achenia bluntly obovate, obeompressed and ridged on the inner side, covered 
with dense white hairs, situated beneath the scales of the involucrum and without 
pappus. 
O. *acerosa. A stout shrub? with soft wood, (a branch of which, one of the Specimens, is 
three feet long;) every part of the plant (in a dried state, at least) covered with a fine close down. 
Leaves alternate, four to eight inches long, acerosely, linear and rigid, like those of a pine tree, nearly 
sessile, pinnatifid, with about two pair of segments, or simply trifid ; both above and below simple ; the 
divisions about the usual width of the leaves of the common Scotch fur, grooved beneath, but so closely 
revolute as to be terete. Flowers in terminal fascicles or divided brinchlets. In some specimens, the 
capitulum appears to be smaller and the achenia more woolly, ‘with only about ten male florets, while 
in others the infertile central florets are aboout twenty; the latter appear, 
not less than 
therefore, to be male plants 
chiefly, but they have also female flowers, which are less woolly; involucrum roundish, of five ovate, 
acute, imbricated scales; male florets obconic, witha slender tube, covered with yellow glands; 
anthers free; stigmas slender, filiform; radial florets about five, the number of the involucrum scales ; 
corolla none; stigmas two, sometimes, short, linear-oblong, smooth ; achenia obovate, truncate, 
internally, covered (particularly towards the summit,) with long conspicuous white hairs. 
A large, erect, spreading bush, with the inflorescence of an Iva 5 the leaves 
alternate, acerosely linear and rigid, pinnately divided into trifid or more compound 
divisions ; capituli sessile, arranged in a compound panicle, as in many Artemisias. 
The whole plant very bitter, but with very little aroma. In habit more allied to 
Artemisia than Iva. Appears to be near! y related to Euphrosyne of Decandolle, as 
well as to Pycrothamnus and Cyclachena, which last, however, is not sufficiently 
distinct from Iva. 
rigid 
t From efure: acuminate. In allusion to the rigid narrow foliage, 
