OF AETS AND SCIENCES. 47 



Pectis diffusa, Hook. & Am., from the specimens of Panama, 

 Seemann, which are all we possess, appears to differ from P. Berlan- 

 dieri only (therefore too slightly) in more numerous bristles to tlie 

 pappus, in the ray 5, in the disk 9 and 10. There are sometimes one 

 or two external setulre. So it comes nearest to P. elongata, and makes 

 a transition to the next section. P. Hcenkeana, Schultz i^Lorentea^ 

 DC), may be the same. Perhaps also no. 967 of Gregg's collection, 

 which, however, is more clearly of the Pectothrix section, the disk- 

 pappus of about 10 long, as many intermediate, and a few small and 

 short exterior setce. 



Pectothrix. This name is preferred to that of Lorentea for the 

 multisetose or multiaristate section, because the latter, as originated by 

 Lagasca, and one species (same as Lagasca's) of Lessing's genus, be- 

 long to Eupectis in the present arrangement ; although, notwithstand- 

 ing the words of the character, Lessing's two original species belong 

 here. The U. S. species are only P. papposa, Gray, remarkable for the 

 rather scanty and barbellate or almost plumose bristles of the pappus ; 

 and P. longipes, Gray ; both confined to near the Mexican border, but 

 not yet detected beyond it; for 3159 of Berlandier, referred to the 

 latter by Hemsley, belongs to the next species. 



The Mexican species which we can make out are as follows : — 



Pectis canescens, IIBK. Nov. Gen. & Spec. iv. 2G3, t. 293. 

 Lorentea cane'scens, & satureioides, Less, in Linn. v. l3o, & vi. 718. 

 X. auricularis, canescens, «& satureioides, DC. Prodr. v. 102. Pectis 

 auricularis, canescens, & satureioides, Schultz Bip. Bot. Herald, 225, 

 nomina tautum. P. latisquama, Schultz Bip. in herb. ; Grav, Proc. 

 Am. Acad. v. 181, var. Berlandieri. P. longipes, Hemsley, I.e., quoad 

 PI. Berlandier, 3159. With hardly a doubt, all these are of one species, 

 with character of ray-pappus quite variable, more so than in the pub- 

 lished accounts. For all our specimens (Berlandier, Ervendberg, 

 Schaffuer, Wright from Nicaragua, Parry & Palmer 1067, the latter 

 by oversight cited under P. Berlandieri by Hemsley) have a pappus 

 in the ray like that of the disk, or a little more scanty, but inclined to 

 be deciduous. The breadth of the involucral bracts varies much. 

 Kunth's specific name is oldest in the genus ; otherwise that of 

 satureioides would be preferred. The pappus is wholly setiform, 

 about 5 innermost and longer bristles more awn-like, being distinctly 

 stouter ; the numerous others all capillary ; outer ones shorter and 

 more delicate. 



Pectis Liebmanni, Schultz Bip. 1. c; Hemsley, 1. c. — San Au- 

 gustino, Liebmann, 467. A most distinct species, cauesceut with soft 



