of tto Species of Tordylium. 347 
These species are clearly distinguishable by a character which, 
though faithfully indicated by Rivinus and Jacquin, has not been 
fixed upon by any botanist as a specific mark. In T. officinale the 
radiant or dilated part of the marginal flowers consists of two 
. neighbouring petals, each of which has one large, and one very 
small, lobe; in T. apulum there is only one radiant petal to each ` 
flower, whose two very large lobes are equal. I would therefore 
propose the following definitions of the two species in question : 
T. officinale, involucellis longitudine florum, foliolis ovatis incisis 
crenatis, petalis radiantibus geminis inæqualitèr bilobis. 
T. apulum, involucellis flore brevioribus, foliolis laciniatis ; supe- 
rioribus angustatis, petalis radiantibus solitariis ED bi- 
. lobis. a 
The synonyms of the former are pasrantly given in both edi- 
tions of Sp. Pi. as well as in FI. Brit. 294; to which are to be 
added Engl. Bot. t. 2440, and the unpublished figure in Fl. Grac. 
t: 967. There is every reason to suppose this the original Togdvasor 
of Dioscorides. 1f Columna had been as exact as usual, his figure 
would have left us in no doubt respecting the character of the 
petals. But asit is, enough may be discerned for our purpose ; and 
the form of the leaves, the length of the partial involucrum, and the 
figure of the seed, all agree with T. officinale, not with apulum. — 
To the latter belong the synonyms of Rivin. Pentap. Irr. t. 2 
and Jacq. Hort. Vind. v. 1. 21. t. 53; which last is quoted in MSS. 
by Linnzeus in his own copy. of Sp. Pl. This is likewise T. apulum 
of Prodr. Fl. Grec. n. 631, from which however must be removed 
the reference to Columna, and consequently the synonym of 
"Tournefort depending thereon; Jacq. Hort. v. 1. t. 53, being in- 
troduced in their stead. Bauhin’s Seseli creticum minimum also, 
being adopted from — belongs to T. officinale. 
VOL. XII. 2z I cannot 
