DESCRIPTION OF PLATES. 
FRONTISPIECE. 
Cactus GROVE IN ARIZONA (CEREUS GIGANTEUS, Engelm.). 
PLATE I. 
ANOTIA HOLACANTHA, Torr.—Branch natural size. Fig. 1. Cross-section of flower. Fig. 2. 
Open flower. Fig. 3. Vertical section of flower. Fig. 4. Inside view of stamen. Fig. 5. . Outside view 
of stamen. Fig. 6. Flower with petals gone, but Alennsais persisting. Fig. 7. Vertical section through 
young ovary. Fig. 8. Ovule. Fig. 9. Vertical section through mature ovary. Fig. 10. Cross-section 
through ovary. Fig. 11. Seed. Fig. 12. Diagonal section through seed. Enlarged 4-5 diameters. 
PLATE I. 
A. PARRYELLA FILIFOLIA, T. & G.—Branch natural size. Fig. 1. Flower. Fig. 2. Vertical sec- 
tion through flower. Fig. 3. Tube of stamens, laid open. Figs. 1, 2, and 3 enlarged 10 diameters. Fig. 
4. Mature legume. Fig. 5. Longitudinal section through Fig. 4, and both enlarged 5 diameters. 
B. PETALOSTEMON TENUIFOLIUS, Gray.—Somewhat reduced. Fig. 6. Bract. Fig. 7. Flower. 
Fig. 8. Flower seen from above, with the four petals on the column “e stamens and the fifth on the 
calyx. Fig. 9. Section through the pod. All enlarged about 10 diamet 
PLATE III. 
A. HoRKELIA PURPURASCENS, Watson.—Natural size. Fig. 1. Flower-bud. Fig. 2. Expanded 
flower. Fig. 3. Calyx, = ae open. All enlarged about 4 diameters. 
B. PoTENTILLA WHEELERI, Watson.—Somewhat reduced. Fig. 4. Flower, seen from above. 
Fig. 5. Flower, seen from below. Fig. 6. Vertical section Girish flower. All enlarged about 5 diam- 
eters. Fig. 7. Single pistil, enlarged about 10 diameters. 
PLATE IV. 
PETALONYX NITIDUS, Watson.—Fig. 1. Branch natural size. Fig. 2. Flower. Fig. 3. Petal. 
Fig. 4. Diagonal section through calyx and tag showing the single xogger ovule, All enlarged. 
Fi Branch of VIGUIERA RETICULATA, Watson.—Natural size. Fig. 7. Disk-flower, enlarged 
20 times. Fig. 8. Chaff of disk-flower, sittadaat 20 times. Fig. 9. Ray-flower, seca caviar Fig. 
10. Section through naked receptacle, enlarged 10 times 
PLATE V. 
BRICKELLIA LONGIFOLIA, Watson.—Branch nearly eo size. Fig. 1. Head of flowers, enlarged 
8-10 times. Fig. 2. Single flower, enlarged 12 times. Fig. 3. Style and stigma, enlarged 12 times. 
Fig. 4. Receptacle and involucre, enlarged 12 times. Fig. 5. Achenium and pappus, enlarged 12 
ters. Fig. 6. Single bristle of pappus, enlarged 20 times. 
26 BOT 401 
