CONTENTS XV 



Fruit — Pollination — Geographical — Environmental Relations 



— Mammoth Clover — Uses 436-440 



Trifolium medium (Zigzag, Medium Red, White, Mammoth 



or Meadow Clover) 441 



Medicago (Medics) — Generic Description — Geographical — 



Key to Principal Species of Medicago 441-442 



Medicago sativa (Alfalfa, Lucerne) — Roots — Stems — "Cut- 

 tings" of Alfalfa — ^Leaves — Inflorescence — Flowers — Pollina- 

 tion — Factors Afiecting Seed Production — Fruit — Germina- 

 tion and Seedling — Geographical — Types of Alfalfa — Environ- 

 mental Relations — Uses and Production 442-449 



Medicago lupulina (Hop Clover, Black Medic, Yellow Trefoil) .449 



Medicago arabica (Spotted Bur Clover) 449-451 



Medicago hispida (Toothed Bur Clover) 452 



Melilotus (Sweet Clover) — Generic Description — Species of 



Melilotus 452-454 



Melilotus alba (White Sweet Clover) — Description 454 



Melilotus officinalis (Yellow Sweet Clover) — Description — 



Environmental Relations — Uses of Sweet Clovers) 4S4-4SS 



Soja (Soy Bean) — Generic Description 4SS~4S6 



Soja max (Soy Bean, Soja Bean, Coffee Bean) — Description — 



Uses 456-458 



Vigna (Cowpea and Related Species) — Description — Species. .458-460 

 Vigna sinensis (Cowpea) — Description — Environmental Rela- 

 tions — Uses 460-462 



Arachis hypogoea (Peanut, Goober) — Habit, Stem — Leaves — 

 Flowers — Development of Fruit — Fruit — Types — Environ- 

 mental Relations 462-465 



Less Important Legumes 465-467 



References 467-468 



CHAPTER XXX.— Linages (Flax Family) 



Habit, Stem, Leaf — Inflorescence and Flowers — Fruit — The 

 Names Derived from"Linum" — Geographical, and Environ- 

 mental Relations 469-470 



Linum usitatissimum (Common Flax) — Habit, Root — Stem — 

 Flax Fibers — ^Leaves, Inflorescence and Flowers — Pollination 

 — Mature Fruit — Seeds — Geographical — Tjrpes and Varieties 

 — Uses — Preparation of Flax Fiber-^Production of Flax 470-474 



CHAPTER XXXL— RuTACE^ (Rue Family). 



Description — Key to Important Genera of Rutaceae 475-476 



Citrus (Citron, Lemon, Orange, etc.) — Habit, Roots — ^Leaves 

 — Flowers — Pollination and Fertilization — Fruit — Seeds — 

 Geographical — Key to Principal Species of Citrus 476-480 



