110 ' CAESALPINACEAE 



the uodea : drupes about IV in diameter. — Freely' escaped, especially 

 around Kansas City. April-May. 



Family 61. MIMOSACEAE Eeichenb. 

 Herbs with alternate decompound leaves and small regular flowers in 

 ped uncled heads. Sepals and petals 3-6 each. Stamens few to numer- 

 ous. Ovary 1-celled, bearing several-many ovules. 



Stems smooth. 1. Acuan. 



Stems prickly. 2. Morongia. 



1. ACUAN Medic. 



Calyx 5-toothed. Petals 5, distinct, whitish. Stamens 5, distinct. 

 Ovary sessile. Ovules many. Pod smooth. 



1. A. lUinoensis (Michx.) Kuntze. False Sensitive Plant. 2°-5° 

 high : leaflets very numerous, linear-lanceolate, about 2^^ long : pods ob- 

 long, curved. — Common in dry ground throughout. June-August. 



2. MORONGIA Britton. 



Calyx 4-5-parted. Petals 5, united to the middle, pinkish. Stamens 

 8-12. Ovary sessile. Ovules many. Pod prickly. Leaves sensitive. 



1. M. uncinata (Willd.) Britton. Prickly Sensitive Plant. 

 Decumbent, l°-4° long : leaflets elliptical, strongly veined, 2'^ long. 

 Locally common in dry woods from Swope Park to Grain Valley and 

 southward. May-June. 



Family 62. CAESALPINACEAE Kl. & Garcke. 

 Plants with simple or compound leaves and regular or irregular non- 

 papilionaceous flowers. Sepals and petals five each. Stamens 10 or 

 fewer. Ovary 1-celled, 1-many-ovuIed. Fruit a legume. 



Herbaceous plants. 2. Cassia. 



Trees. 



Flowers pink. 1. Cercis. 



Flowers greenish-white. 



Very thorny. 3. Gleditschia. 



Not thorny. 4. Gymnocladus. 



1. CERCIS L. 



Leaves simple, cordate, entire. Flowers in axillary fascicles, preceding 

 the leaves. Calyx 5-toothed. Corolla imperfectly papilionaceous, the 

 standard enclosed by the wings in the bud and the keel longer than the 

 wings. Stamens 10, distinct. Pods oblong, flat. 



1. C. Canadensis L. Red Bud. A small tree. Common in rocky 

 woods. April-May. 



2. CASSIA L. 



Herbs with abruptly pinnate leaves and large yellow flowers. Sepals 

 nearly distinct. Petals nearly equal, clawed. Stamens 10, unequal. 

 Ovules many. 



Leaflets more than 12''' long. 



Leaflets 4-6. 1. C. Tora. 



