FERNALD. — GENUS PECTIS. 65 
__ awns and low diffuse habit to separate it from the erect entire-leaved spe- 
cies of § Pectidium with smooth awns. The subgenus Hupectis, too, as 
recently defined by Dr. Gray, seems to contain two well marked groups, 
and therefore essentially the distinctions made by him in Plantze Wright- 
iane have been adopted : § Hupectis, with definitely paleaceous pappus, 
and § Pectidopsis, with a few slender but rather rigid ariste. The sub- 
= genus Pectothrix has been taken up as defined by Dr. Gray in the 
_ Proceedings of the American Academy, it being impossible to find any 
satisfactory character to distinguish the old and confused § Lorentea. 
As suggested before, these groups are not constant in their characters. 
_ Bat with the exception of a few cases, they are fairly well marked. Some 
a 
= forms of § Hupectis (P. Berlandieri and Sinaloensis) may have the pales 
rarely deciduous from the bases of slender awns, thus assuming the 
; characters of § Pectidopsis. Other species (P. arenaria and bracteata) 
_ have in addition to definite pales some slender sete, in this making a 
close approach to members of § Pectothrix (P. Henkeana, longipes, 
-eanescens, &c.) with a few stout elongated sete. In § Pectidopsis and 
§ Pectothrix the pappus in either the disk or ray, or in both, may be 
reduced, and in such cases species, ordinarily well marked, may be con- 
fused. For instance, there are rarely such specimens of P. papposa with 
subfastigiate heads hardly to be distinguished from similar forms of 
- angustifolia. In some species, too, of § Pectidopsis (P. filipes and 
capillaris for example), the pappus, either in the disk or ray, consists of 
Tather stout smooth awns suggesting those of § Pectidium. In § Pecto- 
thrix the bristles are normally more than 10, but in P. elongata and 
diffusa they may become reduced in number and more or less dilated 
low, as in species of § Pectidopsis (P. Berlandieri, &c.). Species of 
§ Heteropectis generally show little tendency to run into the other sub- 
seuera, but the disk-pappus in two species, P. multiseta and ambigua, is 
reduced, And in the apparently well-marked § Pectidivm the pappus of 
- imberbis may sometimes have, in addition to the rigid awns, a few 
paleaceous awns not unlike forms in § Hupectis; or the pappus may be 
entirely obsolete, as in the other subgenera. 
CTIS, L. Rather low branching mostly aromatic or heavy- 
Scented herbs with opposite connate generally glandular-dotted leaves 
peer With a few basal sete, rarely setiferous to the tip, or even naked : 
eads small or middle-sized, mostly radiate, sessile or on bracteate 
peduncles, solitary or subcorymbose: involucre cylindrical or campanu- 
ate, naked at the base, of a single series of equal free generally glandu- 
ar-dotted carinate and often involute bracts, more or less conduplicate 
VOL. RXx111,— 5 
