HI 



156 



EXPLANATION OF THE PLATES. 



Plate 1 — Daleaformnsa — A branch of the natural size, with a separate flower magnified. 



Plate 2 — Fallugia paradoxa. — Natural size, with a separate carpel magnified. 



Plate 3 — Larrea Mexicana. — A branch of the natural size. Figure 1. Separate flower. 

 Figure 2. External view of a stamen, with a scale at its base. Figure 3. The same, 

 seen from the opposite side. Figure 4. Ovary and style. The -last three figures mag- 

 nified. 



Plate 4 — Zinnia grandijlora. — The entire plant, except the root. Figure 1. A head of 

 flowers. Figure 2. A ray flower, natural size. Figure 3. A disk flower. Figure 4. 

 Stamen. Figure 5. Portion cf the style, with its branches. The last three figures more 

 or less magnified. 



Plate 5 — Ridellia tagetina. — A branch of the natural size. Figure 1. Achenium and pap- 

 pus of a ray flower magnified. Figure 2. A ray flower less magnified. Figure 3. A 

 disk flower. Figure 4. Part of the style,- with its branches. The last two figures con- 

 siderably magnified. 



Plate 6 — Baileya midtiradiata. — The whole plant, except the lower portion of the stem. 

 Figure 1. A ray flower. Figure 2. A disk flower. Figure 3. Two of the stamens. 

 Figure 4. Style and its branches. All magnified. 



Plate 7 — Arctostaphylos pungens. 



Plate 8 — Fouquiera spinosa. — Summit of the stem and panicle of flowers. Figure 1. A 

 capsul", with the valves separated, showing the plaeentiferous axis. Figure 2. A seed. 

 (Both of natural size.) Figure 3. Tranverse section of a. seed. Figure 4. Embryo. 

 (The last two magnified.) Figures 5 and 6. Spiral vessels composing the testa of the 

 seed, greatly magnified. 



Plate 9 — Quercus Emoryi. — Figures 1 and 2. Acorns of the same. All the figures of 

 natural size. 



Plate 10 — Sesleria dactyloides. — The entire plant of the natural size. Figure 1. A spike- 

 let. Figure 2. Glumes. Figure 3. Staminate flower. Figure 4. The same, with the 

 paleae removed. All the figures magnified. 



Plate 11 — Ipomcea leptophylla. — A branch of the natural size. Figure 1. Pistil. Figure 

 2. Capsule. Figure 3. Seed. All the figures of natural size. 



Plate 12 — Chondrosium ftzneum — Two plants of the natural size. Figure 1. A spikelet 

 magnified. Figure 2. The same, with the glumes removed, somewhat more highly 

 magnified. Figure 3. Upper palea of the perfect flower. 



