of the Class Composites. 229 



Nomen ad receptaculum crebre paleatum refert, a 7rAeo? refertus, 

 et xapfyos perfect. 



1. P. revolutus. 



In Chili ad Coquimbo. Caldclcugh. J? . 



This curious and well-marked genus has been referred to the 

 Jungea entirely from its similarity of structure in the parts of 

 fructification : for its habit certainly indicates no affinity to 

 Jungia, unless we regard the stipule-like appendages of the 

 leaves of Pleocarphus and some species of the former genus as 

 pointing out a connexion. 



Trib. 3. Polyachyre£. Receptaculum paleatum. Flosculi 



uniformes, hermaphroditi, bilabiati. Stigmata linearia, 



truncata, apice papillosa. Achenia difformia. Herbce foliis 



pinnatijidis. 



a. Pappo difformi. 



Polyachyrus. Las. et Dec. 



•5 ■ 



Involucella tetraphylla, biflora, in capitulum congregata. Flos- 

 culi inaequales. Pappus flosculo interiori elongatus, plu- 

 mosus. 



Capitulum compositum, globosum, basi squamis aliquot ovato- 

 lanceolatis mucronatis rigidis munitum. Involucella plu- 

 rima, tetraphylla, biflora, paleis ovato-lanceolatis, mucro- 

 natis, lanugine interstinctis interjecta : foliolis imbricatis, 

 ovali-oblongis, apice emarginato-truncatis, scariosis, colo- 

 ratis, conniventibus ; exteriore latiore, basi gibbosa. Re- 

 ceptaculum partiale nudum. Flosculi singulo involucello 

 gemini, hermaphroditi, bilabiati, intequales (exteriore mi- 

 nore) ; labio exteriore ligulato, obtuse tridenticulato, patu- 

 lo; interiore profunde bipartito: laciniis lineari-lanceolatis, 

 acutis, spiraliter revolutis. Antherce appendiculii lineari- 



lanceolata 



