166 
Fig. 
EXPLANATION OF THE PLATES. 
PLATE XVI. LAYIA PENTACHZETA.—Pack 108. 
A FLOWERING BRANCH OF THE NATURAL SIZE。 
1. Vertical section of part of a head of flowers ` wears 
2. A ray flower, with its embracing involucral scal 
3. A marginal = of the receptacle. 
4. A disx flow 
5. A stamen w ch same; magnified. 
6. Style of a ray flower ; magnified. 
7. Style of a disk flower; equally vet SET 
8. Involucre and receptacle ; enlar 
9. Achenium of a ray flower ہہت‎ its scale. 
10. Achenium of a disk flower, with its pappus; the details variously magnified. 
Prate XVII A. CALAIS BIGELOVII. 一 PAGE 113. 
A PLANT OF THE NATURAL SIZE. 
ç r A separate flower; magn 
ified. 
. Divisions of the style, showing the stigmatic lines ; highly magnified. 
=. An exterior achenium, and 
4. An interior achenium ; both ee enlarged. 
5. A separate palea of the pappu 
Prate XVII, B. CALAIS TENELLA.— PAGE 114. 
. 6. A separate flower ; m 
agnified. 
7. Divisions of the style; highly magnified. 
8. An achenium, destitute of pappus. 
9. Another achenium crowned with two awned palez. 
10. The receptacle. The last three figures equally magnified. 
PrarE XVIII. CALAIS CYCLOCARPHA.—Pace 113. 
: is flower; magnified. 
stamen ; more highly e 
i € pun gemi magnified. 
4. Ana ium cr wned with its pappus ; magnified. 
5. A Zeg: palea ; e magnified. 
6. Receptacle ; enlarged 
PLATE XIX. ERIOGONUM LACHNOGYNUM.—Pace 132. 
AN ENTIKE PLANT OF THE NATURAL SIZE. 
o e سیت‎ from which several flowers protrude ; magnified. 
th laid ed. 
: Perian Open; more magnifi 
pedicel, with a pair of و‎ at its base ; equally magnified. 
ge A third and broader bracteole, inserted exterior to the itat: equally magnified. 
4. The pistil ; more magnifi 
5. A ripe achenium ; considerably enlarged. 
6. Embryo, from the 
了 PrATE XX. OBIONE HYMENELYTRA.—Pace 129. 
1. A branch, with male flowers, of the natural size. 
2. A branch from a female plant, with fruit, of the natural size. 
3. A male flower ; magnified. 
x A female flower ; also magnified. 
. The same, with one bract removed to show the pistil ; more enlarged. 
6. Embryo; considerably magnifi 
