402 DESCRIPTION OF PLATES. 
PLATE VI. 
APLOPAPPUS CERVINUS, Watson.—Fig. 1. Branch natural size. Fig. 2. Inner scale -of involucre. 
Fig. 3. Outer seale of involucre. Fig. 4. Disk-flower. Fig. 5. Style and stigma. Fig. 6. Anther. All 
enlarged except the branch. 
PLATE VII. 
A. Townsenpia Roturocku, Gray.—Natural size. Fig. 1. Inner scale of involucre. Fig. 2 
a. Fig. 3. Ray-flower, style, and stigma. Fig. 4. Portion of i of ray-flower, enlacped 
Fig. 5. Disk-flower. Fig. 6. Cross-section of achenium. Fi ig. 7. Style and stigma of disk- 
eh Fig. 8. Bristle from ray-flower pappus. All 10 diameters, except shea otherwise stated. 
. ASTER COLORADOENSIS, Gray.—Natural size. Fig.9. Ra y-flower. Fig. 10. Ray-flower style 
and stigma. Fig. 11. Disk-flower. Fig. 12. Disk-flower style and stigma. Fig. 13. Achenium and 
pappus of disk-flower. Enlarged about 10 times. 
PLATE VIII. 
ACTINOMERIS WriGuHTI, Gray.—Branches natural size. Fig. 1. Ray-flower. Fig. 2. Disk-flower 
and subtending chaff. Fig. 3. Disk-corolla, with style protruding. (Figs. 1, 2, and 3 praia about 
4 times.) Fig. 4. Style and stigma, 10 diameters. Fig. 5. Mature achenium, qaikiged 15 time 
PLATE IX. 
THIA ARIZONICA, Gray.—Branch natural size. Fi ig. 1. Section through receptacle, showing 
ray-flower and disk-flower in position, the latter ae by its chaff; somewhat enlarged. Fig. 2. 
Chaff of disk-flower. Fig. 3. Disk-flower. Fig. 4. Style and stigma of disk-flower. Fig. 5. Mature 
achenium of disk-flower. Fig. 6. Style and stiginn rf plerstin: Fig. 7. Mature achenium of ray- 
flower. All 10 diameters, unless otherwise stated. 
PLATE X. 
A WHEELERI, Gray.—Natural size. Fig. 1. Vertical section through receptacle, show- 
ing ray- and porepes in position. Fig.2. Ray-flower, with its achenium enclosed by scale of invo- 
Jucre. Fig. 3. Chaff of disk. Fig. 4. Disk-flower with abortive ov ary. Fig. 5. Top view of no eee 
showing also scales of the involucre. Fig. 6. Scale of involucre enclosing ray-achenium. Fig. 7 
Mature ray-flower achenium 
PLATE XI. 
LAPHAMIA MEGALOCEPHALA, Watson.—Fig. 1. Branch natural size. Fig. 2. Single flower. Fig. 
3. Style and stigma. Fig. 4.—. Fig.5. Stamen. All enlarged about 10 times 
PLATE XI. 
LEUCAMPYX NEWBERRYI, Gray.—Natural size. Fig. 1. Vertical section through the receptacle, 
showing ray-and disk-flowers; also involucral scale and embracing chaff. Fig. 2. Single scale of invo- 
Iucre, Fig. 3. Ray-flower. Fig. 4, Chaff of the receptacle. Fig. 5. Disk-flower. Fig. 6. Style and 
stigma of disk-flower. All except the branch enlarged about 7 times. 
PLATE XIII. 
ARTEMISIA RoTHROcKUH, Gray.—Natural size. Fig. 1. Head of flowers, Fig. 2. Section through 
the same. Both enlarged about 12 times. Fig. 3. A single flower. Fig. 4, Style and stigma, 
PLATE XIV. 
PYRRHOPAPPUS ROTHROCKH, Gray.—Natural size, Fig. 1. Flower, enlarged 5 times. Fig. 2. 
Style and stigma, enlarged about 15 ee Fig. 3. Young head closed, enlarged about 3 times, Fig. 
4. Achenium and pappus, enlarged about 5 diameters, Fig. 5. Involuere reflexed, showing markings on 
the convex receptacle, enlarged abont 4 times. 
