PAPILIONACEAE 111 



Leaflets 8-18. 



Leaflets macronate-pointed. 2. 0. Marylandica. 



Leaflets acuminate. 3, 0. occidentalis. 



Leaflets less than 10" long. 4. C. Chamaecrista. 



1. C. Tora L. Low Senna. Annual, 2''-3° high : leaflets obovate, 

 obtuse : flowers in axillary racemes : pods 6' long, curved. — Adventized 

 at Levasy. Rare. July-September. 



2. C. Marylandica L. Wild Senna. Perennial, 2°-6° high : leaflets 

 6-9 pairs, elliptic-oblong, glabrate : flowers in axillary racemes : pods 

 2'-4' long, linear. — Local in rich woods throughout. July-August. 



3. C. occidentalis L. Coffee Senna. Annual, 3°-6° high : leaflets 

 4-6 pairs, ovate-lanceolate, ciliate : flowers in axillary racemes : pods 

 4''-6'' long, linear. — Adventized at Kansas City north of {Surge Park 

 and at Sheffield. Rare. June-October. 



4. C. Chamaecrista L. Paeteidge Pea. Annual, 1°-3° high : leaf- 

 lets 20-30, linear-oblong: flowers showy, 2-3 together in axillary clusters : 

 pods oblong-linear. — Very common in dry soil throughout. July-Sep- 

 tember. 



3. GLEDITSCHIA L. 



Large thorny trees with once or twice pinnate leaves, and small green- 

 ish, polygamous flowers in spikes. Sepals and petals 3-5 each. Stamens 

 6-10. Pods flat, coriaceous. 



1. G. ttiacanthos L. Honey Locust. 30°-100° high : thorns stout, 

 branching : leaflets oblong-lanceolate, S^'-IS" long : pod linear-oblong, 

 1° or more long. — Abundant along water courses. May. 



4. GYMNOCLADUS Lam. 



Trees with twice pinnate leaves and whitish polygamous or dioecious 

 flowers in racemes. Calyx tubular beneath, 5-cleft above. Petals 5, in- 

 serted on the calyx tube. Stamens 10, short, inserted with the petals. 

 Pod oblong, flat. 



1. G. dioica (L.) Koch. Kentucky Coffee Tebe. 40°-75° high : 

 leaves 2°-3° long, the ovate leaflets l''-2' long : pods 6''-10' long. — 

 Eatber common in rich woods throughout. May. 



Family 63. PAPILIONACEAE L. 



Plants with alternate, compound, stipulate leaves and perfect flowers. 

 Calyx 4-5-toothed or cleft. Petals five, irregular, and flowers usually 

 papilionaceous. Stamens usually ten. Pistil one, superior, one- or two- 

 celled, or transversely 2-many-celled by cross partitions. Style simple. 

 Fruit a legume. 



Not herbaceous vines. 

 Leaves 1-foliolate. 2. Ceotalaeia. 



Leaves 3-5-foliolate: 

 Stamens 10, distinct. 1. Baptisia. 



Stamens monadelphous or diadelphous. 

 Leaflets denticulate. 



