148 
CALIFORNIA. 
[ Composite. 
basi cuneatis apice grosse dentatis, capitulis terminalibus solitariis vel subtribus in spicas 
glomeruliformes axillares digestis, involucri foliolis glabris apice liinbriatis, acheuio oblongo 
glaberrimo pluri-costato. — Mich.-^Pursh, FI. Bor. Am. v. 2. p. 523. 
There are two very distinct states of this plant, which we had almost supposed to be different species; 
but Lessing-, whose authority is doubtless high, as he appears to have seen numerous specimens, 
describes both without distinguishing them even as varieties. In one, the heads of flowers are collected 
usually by threes, into short compact spikes or racemes, which are almost invariably axillary. In the other, 
the inflorescence is more lax, and the heads of flowers are constantly solitary and terminal. Neither in the 
involucre, achenium, pappus, nor leaves, is there any difference. It was found also by Mr. Menzies, on the 
coast of California. 
1. Xantbium Canadense. Mill. — X. maculatum. Bqf. in Sill. Journ. — X. orientale. 
Limi.jil. 
The fruit of this species is larger than that of X. strumarium, and the two beaks to it are slightly incurved 
at the apex, while in X. strumarium they are nearly straight. Whether these be sufficiently good characters, 
we are inclined to doubt, but have not been able to discover any others. We presume it is the X. stru- 
mariuni of Pursh, Nuttall, Elliott, and other North-American Botanists, and indeed we have seen no other 
from North America. 
1. Kmkixo^Wiartemisicefoliai caule hirsuto, foliis bipinnatifidis subtus canescentibus laciniis 
sinuato-dentatis obtusiusculis, racemis termiualibus ternis aggregatis. Linn. — Pursh, FI. 
Bor. Am. v. 2. p. 581. — A. absintliiifolia. Mich. Am. v. 2. p. 283. 
The spines of the fruit are short and strong. 
1. Franseria Chamissonis ; liirsuto-incana, caule decumbente herbaceo, foliis coiifertis 
rotundato-ellipticis ihtegris bipinnatisectisve segmentis divergentibus obtusis, petiolis plani.s, 
capitulis masculis cernuis foemineis erectis . — Lessing in Linncca, v. 6. p. 507. 
The solitary and most imperfect specimen of this plant in the Collection, we have compared with one re- 
ceived from Chamisso. The leaves seem very variable. 
1. Bidens chrysanthemoides ; foliis lanceolatis elongatis acuminatis connatis remote serratis 
glabris, floribus louge radiatis cernuis, involucri foliolis exterioribus foliaceis interioribus 
longioribus. — Mich. Am. v. 2. p. 136. 
1. Tridax ? galardioides; hispido-pilosus, foliis alternis sessilibus lineari-lanceolatis 
inferioribus pinnatifidis. 
Caulis herbaceus, decumbens, patentim hispido-pilosus, ramosus ; rami subelongati, usque ad apicem parce 
foliosi, capitulum unicum terminalem gerentes. Folia lineari-lanceolata, alterna ; inferiora pinnatifida, seg- 
mentis brevibus, obtusis, patentibus, superiora integra omnia hispide pilosa. Involucrum hemisphajricum, 
simplex, polyphyllum : foliola oblonga, acuta, basin florum radii eorumque achenia involventia. Corolla 
radii lutea?, basi attenuatie, apice explanatm, planie, trifidue, stylum absque staminibus gerentes; disci 
tubulosse, lutese. Paha lineari-oblongse, submembranacea?, pluriseriales, inter radii discique flores inteijectae, 
receptaculo piano alioquin nudo. Antliera purpurascentes, ecaudatse. Styli rami recurvati, appendiculis 
linearibus puberulis superati. Achenia (juniora) oblonga, erostrata, basi attenuata; radii glabra, apice calva; 
disci pilosa ; pappo persistente rigido basi plumoso apice simplici. 
If this were to form a new genus, we would propose the name of Layia, after one of the discoverers; 
and this would principally differ from Tridax or Balbisia, by the shape of the involucre, its consisting of 
numerous leaves, which are opposite to, and are respectively wrapt round, the achenia and tube of the corolla 
