SPRING FLORA OF MANHATTAN. 21 



B. Arkansana, Porter. Stem prickly or nearly unarmed. Prairie, 

 common. 



PYRUS, L. 

 P. Coronaria, L. Twigs and simple leaves glabrous or nearly so. 

 Flowers umbellate. Bluffs along Kansas river, not common. Often 

 thorny with stunted branchlets. 



P. iowejisis, (Wood) Bailey. Thicker leaves and the twigs woolly. 

 Woods about St. George. 



CRATAEGUS, L. 

 Twigs bearing smooth, simple thorns. 



C. coccinea, L. Leaves ovate-cordate, thin, glabrous, incised. Fruit 

 globose, scarlet. Bluffs, rare. 



C. mollis, Scheele. Leaves thicker and larger, downy beneath. 

 Bluffs, rare. 



31. LEGUMINOSAE. 

 Sepals 5, usually more or less united. Petals 5 (one in Amorpha), 

 usually irregular. Stamens usually 10, distinct or united. Pistil one, 

 simple. Fruit a legume Leaves alternate, with stipules, mostly com- 

 pound. 



SUBORDER PAPILIONAT^E. 

 Corolla papilionaceous, the upper petal, or standard, enclosing the 

 others in the bud. 

 Leaves palmately compound. 



Stamens distinct Bo.ptisia 



Stamens diadelphous. 



Flowers in heads Trifolium 



Flowers in spikes or racemes Psoralea 



Leaves pinnately compound (if trifoliate, the terminal leaflet stalked.) 

 Leaflets 3. 



Flowers yellow or white Melilotus 



Flowers purple Medicagn 



Leaflets more than 3. 



Shrub Amnrpha 



Herbs. 



Leaves odd-pinnate Astragaluft 



Leaf stalk terminating in a tendril Vicia 



Leaf-stalk terminating in a bristle Lathynis 



BAPTISIA, Vent. 

 Stamens distinct. Legume oblong, inflated, stalked in the persistent 

 calyx. Leaves palmately 3-foliate. 



B australis, (L.)li. Br. Smooth. Flowers blue in an erect raceme. 

 Prairie, frequent. 



B. teucop/ioea, Nutt. Hairy. Flowers yellow, in a reclining raceme. 

 Prairie, common. (Hybrids with the foregoing occur.) 



MEDICAGO, L. 

 Stamens diadelphous. Leaves pinnately 3-foliate. Legume more or 

 less coiled. 



M. sativa, L. Escaped from cultivation, frequent. 



