SPRING FLORA OF MANHATTAN. 25 



STAPHYLEA, L. 



Petals 5 Ovules several. Fruit much inflated. 

 S. tfifolia, h. Leaves pinnately 3-foliate. White flowers in drooping 

 racemes. Woods, not common. 



39. ACERACEAE. 

 Flowers polygamous or dioecious, regular. Ours apetalous. Ovary 

 2-celled and 2-lobed, 4-ovuled. Fruit a samara (double), unsymmetrically 

 winged at apex. Leaves opposite. Woody plants. 



ACER, L. 

 Leaves simple, palmately lobed. 



A. saccliarinum, L. Flowers in umbel-like clusters much preceding 

 the leaves. Common along Blue river. 



RULAC, Adans. 

 Leaves pinnately 3-.5-foliate. Flowers dioecious, the staminate on 

 capillary drooping pedicels. 



R. Neguiido, (L ) Ilitchc. Low woods, frequent. 

 40. HIPPOCASTANACEAE. 

 Flowers usually irregular. Stamens more numerous than petals. 

 Ovary ;-!-celled. Woody plants with compound leaves. 



^SCULUS, L. 

 Calyx tubular. Petals unequal. Stamens 7. Leaves palmate. 

 ^. arguta, Buckl. A small tree with polygamous, yellow flowers in 

 terminal panicles appearing with the leaves. Petals 4. Leaflets 7. 

 Woods, frequent. 



41. RHAMNACEAE. 

 Sepals, petals and stamens 4-5, the latter opposite the petals. Shrubs 

 with alternate, simple leaves. 



RHAMNUS, L. 



Disk lining the calyx free from ovary. Fruit a drupe. 



R. lanceolata, Pursh. Flowers more or less clustered, axillary, 

 greenish, the parts in four's. Upland woods, rare. 

 CEANOTIIUS, L. 



Disk lining the calyx cohering with the ovary. Fruit dry, separating 

 into 3 parts at maturity. 



C. ovatuii, Desf. A low shrub with gladular-serrate leaves and white 

 flowers in dense, terminal, umbel-like clusters. Prairie and open woods, 



common. 



42. VITACEAE. 



Sepals (when present), petals and stamens 4-5, the latter opposite the 

 petals Ovary 2-celled, 4-ovuled Woody vines provided with tendrils 

 opposite the leaves. Fruit a berry. 



VITIS, L. 



Calyx lobes scarcely developed. Petals separating below and falling 

 from the expanding flower without opening. Leaves simple. Flowers 

 in a compound panicle, small and very fragrant. 



V. vnlpina, L. Leaves cordate, 3-lobed, incised-serrate, smooth. 

 Woods, common. 



