60 PROCEEDINGS OF THE AMERICAN ACADEMY. 
but one of the latter, P. elongata, with “aristis crebris (20-25), scabris, 
inzequalibus, patulis, rufescentibus, persistentibus, corollam et akenium 
eequantibus,” has since been found in Mexico. P. Bonplandiana, with 
“ aristis 8-10, scabris, basi paulo dilatatis, rufescentibus, corollam «quan- 
tibus,” is identified with more recent specimens from Southeastern 
Mexico; and P. canescens is a species with variable pappus originally 
described as having the disk-akenes with “ paleis 20-20, aristaeformibus, 
scabriusculis, ineequalibus, rufescentibus, corollam vix superantibus, per- 
sistentibus,” while the ray-akenes are with “ squamulis nonnullis minutis 
subulatis.” The fourth species, P. pygme@a, has not yet been found in 
North America. 
In 1823 Cassini! discussed Lorentea, Lag., stating that it is undoubt- 
edly the same as his own Chthonia. But, though Lagasca’s genus was 
published some months before Cassini’s, he clings to his own name, 
arguing, that compared with his own, Lagasca’s description is inadequate. 
Chthonia repens,? based perhaps on Pectis humifusa, Swartz, and a second 
species, ©. leptocephala,? are described; and after some speculative 
remarks upon the genus, Cassini says, ‘“ Nous présumons que les Pectis 
pygmea et Bonplandiana sont des Chthonia, et que les Pectis elongata 
et canescens sont des Oryptopetalon.” 
In 1825 Cassini‘ discussed Pectis, restricting it to P. linifolia, L., and 
P. punctata, Jacq., and he again emphasized the distinctions he m 
between the genera: “ Les vrais Pectis different essentiellement des 
Chthonia et des Cryptopetalon, par Vaigrette, dont les squamellules sont 
subtriquétres, subulées, cornées, parfaitement lisses; car les squamellules 
de l’aigrette des Chthonia sont paléiforme et dentées inférieurement, fill- 
formes et barbellulées supérieurement ; et celles des Cryptopetalon sont 
filiformes et barbellulées d’un bout & l’autre.” 
Torrey’s P. angustifolia, described in 1828,° was the first species of 
Pectis recognized without awns, pales, or seta. The original form with 
a squamellose crown is not, however, constant, for there are sometimes 
present one or two slender awns. 
In 1830 Lessing * took up the name Lorentea, and applied it toa group 
very different from that of Lagasca. The characters as given by Lessing 
1 Cass. in Dict. Sci. Nat. xxvii. (1823) 202-207. 
2 Cass. l. c. 
% Cass. 1. c. 206. 
4 1. e. xxxviii. (1825) 202, 203. 
& Torr. Ann. Lyc. N. Y. ii. 214. 
6 Linnea, v. 135. 
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