ee ae 
FERNALD. — GENUS PECTIS. _ 59 
Poiret,' who discussed five of the species already mentioned (omitting 
P. minuta and P. prostrata) and described an additional one, P. fascic- 
ulata* from an unknown habitat. P. ptnnata, Lam, he retained doubt- 
fully in the genus, and P. punetata, Jacq. he kept distinct from P. linifolia, 
L., describing the pappus of the latter as “deux poils roides et piquans,” or 
in the ray-akenes “ trois poils trés-ouverts,” while the pappus of the former 
he describes as “ deux filets sétacés ” ; yet apparently Poiret had not seen 
this species and his description was drawn directly from Jacquin. 
In 1816 Lagasca founded the genus Lorentea,’ distinguished generi- 
cally from Pectis by the character, “ pappus paleaceo-setaceus, paleis 
pluribus, ineequalibus.” The original species, L. prostrata from Cuba, 
has subsequently been identified ¢ with P. humifusa. 
Cassini in 1817 described the genus Oryptopetalon ® with one species, 
C. ciliare from Peru. The genus was distinguished by the “ aigrette ... 
Composée de squamellules nombreuses, plurisériées, inégales, filiformes, 
fortement barbellulées, roides comme des crins, rousses, entre-griffées & la 
base.” In the same year he founded the genus Chthonia® with one 
Species, C. glaucescens. This genus Cassini distinguished from Pectis by 
its paleaceous pappus, while in true Pectis, he argued, the pappus is of 
“squamellules subtriquétres, subulées, cornées, parfaitement lisses. Ainsi, 
les pectis punctata et linifolia doivent demeurer dans le genre Pectis ; 
mais les _peetis humifusa, prostrata, et probablement le ciliaris, doivent 
eutrer dans le genre Chthonia.” 
The collections made by Humboldt and Bonpland during the great 
scientific expedition headed by Humboldt, contained at least four species 
of the genus Peet's (of which Ohthoniia was made synonymous), and 
these were described in 1820.7 The characterization of the involucre, 
which had formerly been described as pentaphyllous, was extended in the 
Seneric description to include forms with 8 or 10 bracts, but the pappus 
character was limited to aristiform pales (*‘ Akenia linearia, triangulari- 
“ompressa, paleis compluribus aristaformibus coronata” *). the four 
Species described two were from Mexico and two from New Granada ; 
Reape antec eA 
1 Dict. v. 119-121. 
? Poir. L. ec. 120. 
® Bull. Soc. Philom. (1817) 12, & Dict. Sci. Nat. xii. (1818) 125. 
® Bull. Soe. Philom. (1817) 83, & Dict. Sci. Nat. ix. (1817) 178, 174. 
" HBK. Nov. Gen. & Sp. iv. 261-264. 
8 HBK. 1. ¢. 261. : 
