174 MR. NUTTALL’S DESCRIPTIONS OF NEW 
Very distinct from the Hymenoxys Californica of Hooker, (Ptilomeris Californica,) 
by its reduced size and smaller number of parts throughout, otherwise its habit and 
that of the following, are still very similar. 
An annual, four to five inches high, the stems and pedicels more or less pilose. 
The leaves small, except the radical ones, simply pinnatifid, with capillary and 
nearly simple segments, all usually terminated. with a blunt gland. _Pedicels 
elongated. Involucrum campanulate, of about eight ovate, subcarinated scales, (as 
usual in the genus, arranged in a single series, so that the involucrum is either 
hemispherical or campanulate, according to the number of its leaves or scales,) rays 
about eight, oval, and short, scarcely emarginate, nearly entire; the radial achenia 
subfusiform, curved, and embraced as in the rest of the genus, by a fold in the scales of 
the involucrum, crowned by a very short and blunt pappus, similar to that of the discal 
_ florets, but nearly abortive. Achenia somewhat terete, minutely scabrous, and partly 
fusiform, in the ray sterile, discal florets with a slender tube. Receptacle small, 
smooth, and naked, conical. : 
Has. In the vicinity of Pueblo de los Angeles, Upper California. Flowering in 
April.” 
P. *arrints. Similar to the preceding, excepting the pappus, which is fimbriate along the margin of the 
narrow scalcs, all termiuating in awns, excepting the rays, which have the same short awnless pappus 
as in the preceding. 
Ifas. With the former. ‘That these are true species, as well as the one which I 
called P. coronaria, I am persuaded by the fact of their retaining the same relative 
character when cultivated. 
One of the species of this very distinct genus, (of which the seeds were sent to 
London from my growing plants in Philadelphia,) having been hastily referred in 
the Botanical Magazine to the genus Hymenoxys of Cassini, the rest of the species I 
described in the Philosophical Transactions have by Torrey and Gray been also 
_placed in that very distinct genus, to which they have in fact no affinity, or external 
resemblance in habit. In Hymenoxys, the involucrum is biserial, with rigid 
appressed scales, of which the interior are longer; the achenia also are turbinate, and, 
as in Actinea, covered with erect, very copious, silky hairs; the rays are also, as in 
that genus, three-lobed at the extremity; the pappus is always entire, acuminately 
awned and consimilar. They are perennials, (at least the section Oxypappus,) and 
one of them was referred, even by H. B. and Kunth to the genus Actinea. I have 
also examined specimens of two or three species of Hymenoxys, in the herbarium of 
Fielding, Esq., of Lancaster, (England,) and perceive no affinity. 
In revising my specimens, I find that the dissimilar radial jlorets are always 
embraced in a central fold of the scales of the involucrum, somewhat after the 
