194 , Mr. D. Don's Descriptions of new Genera and Species 



Involucrum copiose glandulosum, serie simplici 8-phyllum, 

 bracteis amplis, foliaceis, ovato-lanceolatis, mucronatis ob- 

 vallatum : foliolis lineari-lanceolatis, mucronatis, nervosis. 

 Receptaculum copiose villosum. Flosculi aurei, copiosi, bi- 

 labiati, hermaphroditi, ajquales : titbo intus hirsuto ; labia 

 eiteriore ligulato, patulo, apice tridenticulato ; interiore altr 

 bipartite : segmentis linearibus, revolutis, apice obtuso, bar- 

 bate. Filamenta compressa, glabra. Antherce appendicula 

 ipsius antherae longitudine, ligulata, coriacea terminate, 

 basi longe biaristatae : aristis nudis, lineari-setaceis. Stylus 

 filiform is, glaber. Stigmata semicylindrica, truncata, minute 

 papillosa. Achenia longitudine fere involucri, angusta, te- 

 tragona, minute papilloso-scabra. Pappus pilosus, fulvo- 

 cinereus : radiis duplici ordine digestis, creberrime denti- 

 culatis, basi solutis, deciduis. 



This genus constitutes the transition from the Cichoracece to 

 the more aberrant groups of the Labiatijhrce. The habit and 

 the general resemblance of its flowers to those of the former 

 family, justify the place which I have assigned to it. I have 

 followed Lacasca and DeCandolle in restoring the old name 

 of Triiis, first applied to designate the original species of this 

 _< nus by Dr. Patrick Browne ; but the genus having been united 

 to Perdicium by Linnaeus, the name was subsequently used by 

 Swartz to denote the Jiaitlieria of Aublet. The third section 

 may probably be reckoned sufficiently distinct to constitute 

 another genus ; but this point I shall leave till further observa- 

 tions shall determine. 



Cleantiies. 



Perdicii sp., L. 



Receptaculum glabrum ! Flosculi indefiniti. Involucrum aequale. 



Involucrum simplici v. duplici ordine polyphyllum : foliolis sub- 



aequalibus. 



