CAESALPINACEAE. 193 



7. Prunus Cerasus L. Sour Cherry. M. p. 525. Woods and thickets, 



escaped from cultivation. 



8. Prunus Avium L. Sweet Cherry. M. p. 525. Woods and thickets, 



escaped from cultivation. Spring. 



9. Prunus Pennsylvanica L. f. Wild Bed Cherry. M. p. 526. Rocky 



woods. Spring. 

 Northampton— Wind. Gap (He.). 



10. Prunus Mahaleb L. Mahaleb. M. p. 526. Waste places and in cul- 



tivation. Spring. 



Philadelphia— Bartram's Garden (Mac). Lancaster— (F.). North- 

 ampton— (F.). 



New Castle — Barley Mill, Tatnall ; S. Park, Hancock street, E. K. 

 Thompson. Escaped by seed, Jackson street. 



11. Prunus Virginiana L. Choice Cherry. M. p. 526. River banks and 



rocks. Spring. 



12. Prunus serotina Ehrh. Wild Black Cherry. M. p. 526. Woods and 



open places. Spring. 



2. AMYGDALUS L. 

 1. Amygdalus Persica L. Peach. M. p. 526. Spontaneous all over the 

 region. 



Family 15. CAESALPINACEAE Kl. & Gaicke. Senna Family- 



Trees or shrubs ; leaves simple ; corolla irregular, apparently papilionaceous, 



but the lateral petals enclosing the upper. 1, Cercis. 



Herbs; flowers perfect; leaves pinnate or bipinnate; corolla nearly regular. 



2. Cassia. 

 Trees ; leaves pinnate or bipinnate ; flowers dioecious or polygamous. 

 Receptacle short ; stamens 3-5; pod flat. 3. Gleditsia. 



Receptacle elongated; stamens 10; pod oblong, woody. 4. Gymnocladus. 



1. CERCIS L. 



1. Cercis Canadensis L. Eedbud, Judas-tree. M. p. 529. Rich soil. 

 Early spring. 



2. CASSIA L. 



Leaflets linear to oblong, numerous, 6-20 mm. long; plants 1.5-6.5 dm. high. 

 Flowers 4-8 mm. broad, short-pedicelled, anthers 5. 1. C. nictitans. 

 Flowers 2.5-4 cm. broad, slender-pedicelled, anthers ]0. 



2. C. Chamaecrista. 

 Leaflets ovate, oblong or obovate, 2-5 em. long; plants 3-15 dm. high. 

 Leaflets 6 or 4, broadly obovate. 3. C. Tora. 



Leaflets 8-18, oblong or ovate-lanceolate. 



Perennial; leaflets oblong, obtuse. 4. C. Marylandica. 



Annual; leaflets ovate-lanceolate, acute or acuminate. 



5. C. OGcidentalis. 



1. Cassia nictitans L. Wild Sensitive Plant. M. p. 529. Sandy fields. 



Summer. 



2. Cassia Chamaecrista L. Partridge Pea. M. p. 529. Sandy fields. 



Summer. 



