164 
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EXPLANATION OF THE PLATES. 
PLATE VI. HORKELIA TRIDENTATA.--PAGE 84. 
AN ENTIRE PLANT OF THE NATURAL SIZE. 
. Àn expanded flower and two buds ; enlarged. 
. The flower laid open; a little more enlarged 
A petal ; magnified. 
A stamen ; more magnified. 
. The head of pistils. 
An achenium, with its persistent style. 
PLATE VII. WHIPILEA MODESTA.-—Pacx 90. 
AN ENTIRE PLANT OF THE NATURAL SIZE. 
A separate flower ; moderately enlarged. 
A sepal ; and, 
A petal; both a little more enlarged. 
Front view of a stamen 
Back view of the same; equally magnified. 
Pistil, transversely divided ; more magnified. 
more magnified, 
A flower, longitudinally divided ; considerably magnified. 
Plan of the flower. 
PrATE VIII. CORNUS SESSILIS.—Paae 94. 
A BRANCH OF THE NATURAL SIZE. 
Umbel of flowers and involucre. 
The involucre ; shown separately. 
exterior leaf of the same. 
Interior leaf of the same. 
A separate flow 
The same, eg m of the petals and stamens removed to show the teeth of the calyx. 
The fruit. 
Dag IX. HOFMEISTERIA PLURISETA.—Pace 96. 
A PLANT OF THE NATURAL SIZE. 
A separate flower; enlarged. 
The corolla of the same laid open ; more magnified. 
A stamen ; still more magnifi 
Two pales and a hair of the pappus; more magnified. 
An achenium, crowned with its pappus; considerably magnified. 
Involucre and receptacle ; moderately magnified. 
PLATE X. ASTER BIGELOVII.—-DPacg 97. 
UPPER PORTION OF THE PLANT OF THE NATURAL SIZE. 
A ray flower. 
A branch of the style from the same. 
A separate stamen from the same. 
Style and its branches, T à disk flower. 
An achenium 
.- A hair of the pappus ; pil magnified. 
