î if
basi cuneatis apice grosse dentatis, capitulis terminalibus solitariis vel subtribus in spicas
gloineruliformes axillares digestís, involucri foliolis glabris apice fimbriatis, achenio oblongo
glaberrimo ^\mi-costato.— Mich.— Pursh, Fi. Bor. Am . v. 2. p. 523.
There are two very distinct states of this plant, which avc had almost supposed to be different species;
but Lessing, Avhose authority is doubtless high, as he appears to hai-e seen mimerous specimens,
describes both without distinguishing them eveu as varieties. In one, the heads of flowers are collected
usually by threes, into short compact spikes or racemes, which are almost invariably axillary. lii the other,
the iufloresconce is more tax, 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 Rlr. Menzies, on the
coast of California.
1. Xnnthiimi Canadense. Mill.— N . maculatimi. R o f. in Sill. Journ.— X . orientale.
L i n n . f l .
The fruit of this species is larger than that of X . stnimarium, and the tn-o bealrs to it are slightly incurved
a t the apcx,^ ivhile in X . strumarium they are nearly straight. Whether these be sufficiently go'od cliaracters,
we are inclined to doubt, but have not been able to discover any others. We presume it is the X . stru-
mariiim of Pursh, Nuttall, Elliott, and other North-American Botanists, and indeed Ave have seen uo other
from North America.
I. Ambrosia artemisiafolia; caule birsuto, foliis bipinnatifidis subtus canescentibus laciniis
sinuato-dentatis obtusiusculis, racemis terminalibus ternis aggregatis. L in n .—Pursh, Fl.
Bor. Am. v. 2. p . 581.—A. absintbiifoba. Mich. Am. v. 2. p . 283.
The spines of the fruit are short and strong.
1. Franseria Chamissonis; liirsuto-incana, caule decumbente herbaceo, foliis confertis
rotundato-ellipticis integris bipinnatisectisve segmentis divergentibus obtusis, petiolis planis,
capitulis masculis cernuis foemineis oxecús.— Lessing in Linnæa, v. 6. p . 507.
The solitary and most imperfect specimen of this plant in the CoUection, Ave have compared with one received
from Chamisso. The leaves seem very A’ariable.
1. Bidens chrysanthemoides; foliis lanceolatis elongatis acuminatis connatis remote serratis
glabris, floribus longe radiatis cernuis, involucri foliolis exterioribus foliaceis interioribus
longioribus.—Alich. Am. v. 2. p . 136.
1. T rid a x ? 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, segmentis
brevibus, obtusis, patentibus, superiora integra omnia hispide pilosa. Involucrum hemisphæricum,'
simplex, polyphyllum : oblonga, acuta, basin florum radii eorumque achenia involventia. Corollæ
radii luteoe, basi attenuate, apice explanate, planæ, trifidæ, stylum absque staminibus gerentes: disci
tubulosæ, luteæ. Palea lineari-oblongæ, submembranaceæ, pluriseriales, inter radii discique flores inteijectæ,
receptáculo plano alioquin nudo. Anthera purpurascentes, ecaudate. S ty li rami recurvati, appendiculis
linearibus puberulis superati. AcAenia (júniora) oblonga, erostrata, basi attenuata; rarfeï glabra, apice calva;
disci pilosa; pappo persistente rigido basi piumoso apice simplici.
If this AA-ere to form a n ew genus, we would propose th e name of Layla, a fte r one of th e discoverers;
and this Ai'ould princ ipa lly differ from Tridax or Balbisia, by th e shape of th e involucre, its consisting of
numerous leaves, Avhich a re opposite to, and a re respectively Avrapt round, th e achenia and tu b e of th e corolla
of the rafiic.1 Oorets: by the raarjinal aeheeia without pappus, and by the imperfect raauner lu which the
reeeptaele is provided with scales: indeed it is diflioult to say if these iu the present case ought not to be
viewed as au inner scries of iuvolucral leaves, lo whiel. some of them bear a close resemblance m colour and
texture In Tridur prommbens, the leaves of the involucre do not surround the aehoma, and the margina
ache i7a Have a pappiif precisely the same as those of tbe disc, and similar to what wc have above described
■ f o i r p i a n t I Z specimti, and that far from a good one, exists in the Oolieetioii :
so resembles a Galardiu, that had we not examined it minutely, wo should have placed it m that genus.
1, Hcliiintlms longifolms; herbaceus, folii.s .alternis oblongo-lanceolatis ba.si in petiolum
planum longe attenuatis Integerrimis flaccitlis penninerviis utrinque glabris margine ciliato-
scabris, involucri foliolis subæqualibus discum superantibus spatlmLato-oblongis appressis
margine hispido-ciliatis, pappi aristis solitariis vel bhiis moequalibiis validis.—Dooi. Fl. Bor.
Am. V. 1. p . 313.
Tliis appears to he a true species of the genus, but the leaves are more like those of a Sudbeckia ; these,
particularly the lower ones, are about five inches long, and much attcnnated at the base into a flat petiole
Ih ic h is about three inches in length. In the upper ones the limb is longer, while the petiole is shorter,
Iq Mr. Douglas’s specimen from the Columbia, the leaves are decidedly glutinous, as if varnished.
1 Bahi°a artcmismfolia ; Mb s alternis sessilibus profunde pinnatifidis subtus nlveo-tomen-
tosis m.argine revolutis, capitidis fasciculatis, involucris 9-phyllis 1-seriabbus cylmdr.aceis,
floribus lad ii lingulatis.—iessiasr in Linnæa, v. 5. p . 160, et v. 6. p . 233.
The above character applies to the usual state of the plant: hut sometimes the leaves are either quite
entire, or they present one, or at most two, short lobes or segments at the side, about tbe mffidle " »
suspect that in this state it may become the Eriophyllum stmchadfohum oí Lagasca. A1 the florets are
fertile : those of the ray are without stamens, aud usualiy about six in number. Leaves of the involucre at
first tomeutose, hut afterward, becoming often quite glabrous. Achema w.tli four or hve angles, or pro-
ieetina ridues, somewliat hispid. Scales of the pappus eight or ten, unequal, linear, " k “ « »"<1 «‘"ated,
about°one-fourth of tlie length of the achenium. Between Eriophjlhmi of Lagasca, to which Mr. Lindley
has united TriAophy lhm of Kuttall, aud Bahia, there appears to be almost no difference: indeed, the only
character pointed out hy Lessing consists in the palea, of the pappus being nneq.ial, linear, and ti-unc. ed
BaUa, and equal, ohlnse, and narrowest a t the base in the other genus. n the present individiml, he
palem are not, as Lessing says, trniieate, but ronnded at the apex : while, on the other hand, those of T , ,dw-
appear sometimes truncated and lacerated. Nor does their attenuation below, or them equality,
prove a rood character, since in our specimens of what we consider Balna ainbras.o.des, from Chill, (the only
species we have received trom that country, .and which consequently is the type of Lagasca s genus Balna,)
the palcæ are short, equal, obtuse, not truncate, and n.irrower nt their base than a t the apex. Balna artaa-
isirfalia was first discovered by Mr. Menzies, in California.
1. Helenium jh ié c s coe ; heibnceum, pubovulum, raifie ramoso abato, foliis alternis oblongis
inferioribus obtusis superioribus acuminatis decurrentibus pelliicido-punctatis mtegernmis,
capitulis solitariis in ramis longe ante apicem apbyllis, involucro polyphyllo reflexo discum
superante, receptáculo subgloboso, radii flosculis lingulatis trilobis p ellu cu lo -p u n ctatis.-
Helciiium pubescens. ÆÏ. ?— Ceplialopliora decurrens. Lessing in Linnæa, v. 6. p. 517.
Lcssinu appears entirely to have overloohed the marginal series of scales on the receptacle, which constitutes
this i miauium, .as its habit indicates, aud not a CcpUopha,'« or Actinella. From H quadridan-
talum it differs by the shape of the réceptacle, and from H. autm.nmie by the le.aves, which wc li.avc always
fonnd entire, aud by tile much sm.aller r.ay, as well ns hy the long simple oue-llowered hra.iclies, like those
of H. quudridcntatum.
5
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