ILLUSTRATIONS. 
PLATES. 
Facing page. 
Puate I. Malvaviseus lanceolatus 20... 0c eee nee eee ee eeees I 
Il. Neotreleasea brevifolia .. 0... eee ee nee eee eee eee 6 
III. Potentilla madrensis..... 2.0 cece nce ence eee eee ee eees 30 
IV. Potentilla rydhergiana....--2.-2.2- 22222 eee ee eee ees 30 
V. Cologania capitata. 2.0.22. eee eee eee een eee eee ee eee ee eee eee 41 
VI. Crotalaria viminalis. ....2--.----2----22 22 cee eee ee ee ees 47 
VIL. Indigofera platycarpa .........000.222222-2 22222 eee ee eee 47 
VILL. Lupinus submontanus ... 2... 2. eee eee ene eee eee eee eee 47 
TX. Phaseolus 0€0NCONUS 0.00. c ee ne eee eee eee 48 
X. Phaseolus pedatus ........000 00.0 eee ee eee eee eee 48 
XI. Colubrina megacarpa 1... 0.2.02 ee en eee eee ee eee eee 48 
XII. Saurauja pringlet.. 2.2... cee ee cn eee eee ee eee eee 48 
TEXT FIGURES. 
Page. 
Fic. 1. Flowers of Polianthes palustris ........-2--2---2-2-2 020200 eee eee eeee 9 
2. Flowers of Polianthes durangensis ....-.------+----20 202 e eee ee eee 9 
3. Flowers of Polianthes tuberosa......2--. 2-22-0222 eee eee eee ee 10 
4. Flowers of Polianthes geminiflora .....-...---.22-+2+-2-+---2+-+-+--- 12 
5. Flowers of Prochnyanthes viridescens ........+.----++++--+-++-----+-- 14 
6. Flower of Manfreda virginica. .........-.--+++-++++--+-- ween eee eens 15 
7. Pods of Acacia ambigua ........ 0.022222 ee ee eee ee eee eee 31 
8. Pod of Acacia unijuga .... 2. eee ee eee eee eee eee eee eens 32 
9. Pod of Mimosa hemiendyta .......222. 0220002222022 e eee cee eee eee 32 
10. Mimosa hemiendyta..........222202 2202-2222 eee eee 33 
11. Fruit of Aspicarpa lanata......-.--2-------- 22-22-02 e eee ee eects 49 
