from that of Kunth, and with T. microcephalum of Pursh, 
which belongs to the same section of the genus. Of the 
latter there are specimens among Mr. Douglas's plants, 
which differ in nothing from Pursh's description, except in 
having scarcely any hairs upon either stem orleaves. In the 
same collection are also two other undescribed species, 
which are so closely akin to the, subject of the present 
article that a description of the one would be incomplete 
without some account of the others. 
One of these differs from T. fimbriatum in having very 
narrow leaves, the lower stipules entire, the involucrum - 
less deeply multifid, the flowers smaller, the limb of the 
calyx dilated and coloured, and each of its divisions 
3-toothed ! This may be called T. tridentatum, and thus 
defined :— 
T, tridentatum ; caulibus ascendentibus subsimplicibus glabris, foliolis line- 
aribus setaceo-denticulatis acutis, capitulis longé pedunculatis, involucro 
fimbriato aristato floribus breviore, stipulis superioribus pectinatis, calyce 
tubuloso: limbo dilatato colorato: laciniis tridentatis aristatis corollà 
brevioribus. 
The other species, of which mention has been made, 
possesses little of the fringed or multifid structure in either 
involucrum or stipulæ ; the leaves are obovate, slightly and 
irregularly denticulated, and the flowers small, and scarcely 
longer than the involucrum, which is undivided, toothed, 
and veiny, and surrounds the flowers like a cup. It may 
from. this circumstance be called T. cyathiferum, and its 
characters will be.these:— —— | 
T.cyathiferum; caulibus prostratis glabris, foliolis obovatis dentieulatis obtusis, 
capitulis longé pedunculatis, involucro cyathiformi truncato venoso dentato 
florum longitudine, stipulis ovatis abbreviatis, calycibus membranaceis: 
laciniis setaceis 3-5-partitis corollee longitudine. 
T. involucratum of Willdenow is extremely similar to 
T. fimbriatum, from which it is distinguished by its simple 
stems, erect habit, smaller flowers, and funnel-shaped, 
inflated calyxes, with ovate, aristate teeth. Such, at least, 
is the structure of our specimens, which ere raised in the 
Botanic Garden, Cambridge, in 1805, from seed sent from 
Berlin, and which we therefore presume to be authentic. 
