110 [166| EXPLANATION OF THE PLATES. 
Pirate XVI. LAYIA PENTACH ZTA.—Pace 108. 
A FLOWERING BRANCH OF THE NATURAL SIZE, 
Fig. 1. Vertical section of part of a head of flowers; enlarged. 
‘A ray flower, with its embracing involucral scale. 
3. A marginal palea of the receptacle 
4. A diss flower. 
5. A stamen of the same; magnified 
6. Style of a ray flower; magnified. 
7. Style of a disk flower; equally Zi aa 
Tge 
10. Achenium of a disk flower, with its pappus; the details variously magnified. 
Prate XVII A. CALAIS BIGELOVII.—Pagz 113. 
A PLANT OF THE NATURAL SIZE. 
Fig. 1. A separate flower; magnified. 
2. Divisions of the style, showing the —— lines ; highly magnified. 
: and 
4. An interior achenium seve moderately enlarged. 
5. A separate palea of the pappus. 
Prats sages. B. CALAIS TENELLA.—Pace 114. 
fe 
& 
. 6. A separate flower; magnified. 
7. Divisions of the style ; highly magnified. 
: An achenium, destitute of pappus 
. Another achenium crowned with ie awned palee. 
a The receptacle. The last three figures equally magnified. 
Prate XVIII. CALAIS CYCLOCARPHA.—Paae 113. 
Fig. 1. A. flower ; magnified. 
2. A stamen; more highly magnified. 
3. The style; equally magnified. 
achenium crowned with its pappus ; magnified. 
. Asingle palea; equally magnified. 
c Receptacle ; blac. 
Pirate XIX. ERIOGONUM LACHNOGYNUM.—Pace 132. 
AN ENTIRE PLANT OF THE NATURAL SIZE. 
Fig. 1. An involucre, from which several flowers protrude ; magnified. 
2. Periant’ id Open ; more fied. 
3. A pedicel, with a pair of bracteoles at its base ; equally magnified. 
3a, A third and broader bracteole, inserted exterior to the others ; equally magnified. 
4. The pistil; more magnifi 
5. A ripe achenium ; considerably enlarged. 
6. Embryo, from the 
Puate XX. OBIONE HYMENELYTRA.—Pacs 129. 
Fig. 1. A branch, with male flowers, of the natural size 
2. A branch from a — plant, with fruit, of the ‘cites size. 
3. A male flower ; magnified. 
agnified. 
: The same, with one bract removed to show the pistil ; more enlarged. 
6. Embryo; cable magnified. 
