SPRING FLORA OF MANHATTAN. 23 



GYMNOCLADUS, Lam. 



Flowers regular, whitish, in terminal racemes. Leaves 2-pinnate. 

 Legume oblong, woody. 



Gr. dioica, (L.) Koch. A large tree with nearly dioecious flowers. 

 Low woods, frequent. 



GLEDITSCHIA, L. 



Flowers small, regular, greenish, in spikes. Legume woody. Thorny 

 trees. 



Gr. triamnthos, L. Leaves 1-2-pinnate. Thorns often much branched, 

 above the axils. Legume elongated. Low woods, frequent. 



CERCIS, L. 



Corolla imperfectly papilionaceous, pink. Legumes thin and flat. 



Trees with simple cordate leaves. Flowers appearing before the leaves. 



C. Canadensis, L Woods, frequent. 



SUBORDER MIMOSOIDE^E. 



Flowers regular, corolla valvate. Stamens distinct, exerted. Leaves 



2-pinnate. 



SCHRANKIA, Willd. 



Corolla gamopetalous, funnel form. Stamens about 10. Legume 

 narrow and prickly. 



S. uncinata, Willd A perennial herb with prickly stems, sensitive 

 leaves and axillary, peduncled heads of pink flowers. Prairies, frequent. 



32. GERANIACEAE. 



Sepals and petals 5. Stamens usually 10. Ovary 5-celled. Herbs 

 with simple but usually deeply lobed leaves. 

 GERANIUM, L. 



G. Carolinianum, L. A low much branched herb with 5-parted and 

 much elf ft leaves, and small pinkish flowers. Sterile soil, frequent. 



33. OXALIDACEAE. 



Differs from the preceeding order in having compound leaves, in 

 ours 3 foliate, with obcordate leaflets. 



OXALIS, L. 



O. comiculata, L. Stem leafy, from a creeping rootstock. Flowers 

 yellow. Fruit erect on a reflexed pedicel. Open ground, common. 



O. stricta, L Differs from the above in having the fruiting pedicels 

 ascending. Common. 



O. violacea, L. Leaves radical, from a scaly bulb. Flowers pink or 

 purple. Rocky soil, common 



34. RUTACEAE. 

 ZANTHOXYLUM, L. 

 Flowers dioecious. Petals and stamens 4-5, the latter alternate with 

 petals. Pistils 2 6. Fruit a fleshy. 2-valved, 1-2-seeded capsule. Prickly 

 shrubs with pinnate, glandular dotted leaves and small greenish flowers. 

 Z. Americanum. Mill. Calyx none. Plant aromatic. Prickles in 

 position of stipules and sometimes also scattered. Leaflets 3-5. Woods, 

 common. 



