EXPLANATION OF THE PLATES. 
| Pram I. CROSSOSOMA CALIFORNICA. —Pacz 63. 
e ， A BRANCH OF THE NATURAL SIZE. 
| Fig. 1. A branch with the leaves more fully developed, and the carpels half mature. 
2. Plan of the flower. 
3. A sepal.’ 
4. A petal. 
5 and 6. Front and back views of a stamen. 
7. A flower, longitudinally divided, to show the insertion of the stamens ; all the figures moderately and equally 
enlarged. 
8. Transverse section of an ovary ; more enlarged. 
9. An ovule; considerably magnified. 
Prate Il. VIOLA SHELTONII. 一 PAGE 67. 
AN ENTIRE PLANT OF THE NATURAL SIZE. 
Fig. 1. Three of the petals ; enlarged. 
2-4. Different views of a stamen. 
5. An anther divided transversely. 
The pistil; all the figures magnified. 
Prag Ill. THAMNOSMA MONTANUM.—Pace 73. 
TWO BRANCHES OF THE NATURAL SIZE-— ONE IN FLOWER, THE OTHER IN FRUIT. 
Fig. 1. Plan of the flower. 
Lë 2. A separate flower ; modemid enlarged. 
| 3. The same, with the calyx and petals removed. 
۱ 4. Immature fruit, dee the meng ` or prolongation of the سیے‎ disk. 
5. Ovary, with one of the carpe inall d, 
| 6. The same reu eder سے‎ sec 
! 7. An ovule; more magni 
8. The fruit; enlarged. 
9. Seed, longitudinally divided ; magnified. 
1 7 Dag IV. HOSACKIA INCANA.—Pace 79. 
A PLANT OF THE NATURAL SIZE. 
Aer Fig. 1. The banner, a wing, and one of the keel-petals ; considerably magnified. 
2. Stamineal tube, laid open ; equally magnified. 
The pistil, longitudinally divided ; also equally magnified. 
4. An ovule; highly magnified 
ye 
Pirate V. SPIRAEA MILLEFOLIUM.--Pace 83. 
UPPER PART OF THE PLANT OF THE NATURAL SIZE. 
Fig. 1. Plan of the flower. 
2. A petal; magnified. 
3. A stamen; equally magnified. 
4. Fructiferous calyx ; also equally magnified. 
5. A separate carpel. 
