DESCRIPTION OF PLATES. 403 
PLATE XV. 
CHETADELPHA WHEELERI, Gray.—Branch natural size. Fig. 1, Involucre, enlarged about 4 
times. Fig. 2. Single flower, about 5 diameters. Fig. 3. Style and opened anther-tube, enlarged 10 
times. Fig. 4. Mature achenium and bapem enlarged about 4 diameters. Fig. 5. A branching bristle 
of the pappus, enlarged about 10 diamete 
PLATE XVI. 
5 RELLA DEBILIS, var. SERRATA, Gray.—Naturalsize. Fig. 1. Singleflower. Fig.2. Flower, 
split open, showing the adnate filaments and united anthers, two of which are bristle-tufted at the 
apex. Fig. 3. Vertical section through flower. Fig. 4. Cross-section through ovary, showing ovules 
on the central placenta. 
PLATE XVII. 
HEDEOMA HYSSOPIFOLIA, Gray.—Natural size. Fig. 1. Flower. Fig. 2. Vertical section through 
g 
flower. Fig. 3. Calyx. Fig. 4. Corolla, opened longitudinally, showing nutlets, style, two perfect 
and two rudimentary stamens. All enlarged 5 diameters, 
PLATE XVII. 
NAMA RoTHROCKH, Gray.—Natural size. Fig. 1. Single flower. Fig. 2. Corolla, laid open, show- 
gstamens. Fig. 3. Calyx, enclosing pistil. Fig. 4. Vertical section through ovary. Fig. 5, Cross- 
section through ovary. Fig. 6. Seed. All enlarg 
PLATE XIX. 
A. GILIA DEBILIS, Watson.—Natural size. Fig. 1. Flower. Fig. 2. Corolla, split open. En- 
larged about 5 diameters 
B. GILia DEMISSA, Gray.—Natural size. 
PLATE XX. 
NVOLVULUS LONGIPES, Watson.—Fig. 1. Natural size. Fig. 2. Pistil. Fig. 3. Cross-section 
of ovary. Fig. 4. Stamen. Figs. 2, 3, and 4 enlarged. 
PLATE XXII. 
HALENIA RotHROCcKU, Gray.—Natural size. Fig.1. Flower, enlarged about 5 diameters. Fig. 
ross-section of — enlarged about 5 diameters. Fig. 3. Vertical section through flower, 
solieaed about 10 diameters 
PLATE XXII. 
FRAXINUS CORIACEA, Wafson.—Fruiting branch, natural size. 
PLATE XXIII. 
ABRONIA VILLOSA, Watson.—Fig. 1. Branch, natural size. Fig. 2. Flower laid open, enlarged 
about 5 diameters. Fig. 3. Cross-section of fruit. 
PLATE XXIV. 
Pacneeraes Wotrt, Watson.—Natural size. Fig. 1. Staminate flower, enlarged 12-15 diameters, 
— . Pistillate dower, enlarged about 10 diameters. Fig. 3. Pistil, enlarged about 10 diameters, 
Fig. Z Vertical section through Fig. 2. Figs. 5. Mature fruit; 6. Vertical section of the same; 7. 
Its annular embryo, all enlarged about 10 times. 
