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 or leaves. 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: Jimbo dilatato colorato: laciniis tridentatis. aristatis corolla 
brevioribus. 
The other. species, of which mention has been made, 
possesses little of the fringed or multifid structure in either 
inyolucrum or stipule ; 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 denticulatis obtusis, 
capitulislongé pedunculatis, involucro cyathiformi truncato venoso dentato 
florum longitudine, stipulis ovatis abbreviatis, calycibus membranaceis: 
laciniis setaceis 3-5-partitis corolla: longitudine. ’ 
T. involucratum- of Willdenow is extremely similar to 
T. fonbriatum, 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 were raised in the 
Botanic Garden, Cambridge, in 1805, from seed sent from. 
Berlin, and which we therefore presume to be authentic. 
Jel. 
