28 SPRING FLORA OF MANHATTAN. 



O. longistylis, (Torr.) DC. Leaves ternately compound, leaflets ovate, 

 incised. Stem i-1 m. Woods, not common. 



PEUCEDANUM, L. 



Fruit ovate, flattened parallel to partition, ribbed on back, winged 

 on margin. 



P. foeniculaceum, Nutt. Leaves much dissected. Flowers yellow. 

 Plant with a strong odor resembling celery. Rocky bluffs, frequent. 



POLYT^ENIA, DC. 

 Fruit oval, flattened parallel to partition, with corky margins. 

 Flowers yellow. Leaves 2-pinnate, leaflets incised. 



P. Nuttallii, DC. i-1 m. high. Rocky soil, frequent. 



47. CORNACEAE. 

 Calyx adherent to ovary. Petals and stamens inserted on disk which 

 crowns the ovary. Style one. Fruit a drupe. Woody plants. 



CORNUS, L. 

 Petals and stamens 4. Ovary 2-celled, 2-ovuled. Leaves opposite. 

 Flowers (in ours) white in flat topped cymes. 



C. asperifolia, Michx. Branches brown or gray. Leaves rough, 

 pubescent above, downy beneath. Fruit white. An upright shrub or 

 small tree. Thickets, common. 



G. sericea, L. Branchlets bright red-brown, woolly pubescent. 

 Leaves elliptical, whitened and nearly glabrous beneath. Branches often 

 elongated, declining and stoloniferous at summit. Fruit drab or bluish. 

 Wet places, not common. 



48. PRIMULACEAE. 

 Calyx free. Corolla 4-5-lobed. Stamens as many as corolla lobes and 

 inserted opposite them. Ovary 1-celled, many ovuled, with central 

 placenta. Herbs with simple leaves. 



ANDROSACE, L. 

 Low plants with radical leaves and mostly umbelled flowers. Capsule 

 5-valved. 



A. occidentalis, Pursh. Annual. Scapes several. Corolla white, 

 small. Sterile hills, common. 



49. OLEACEAE. 

 Calyx and corolla 4- cleft, one or both sometimes absent. Stamens 2. 

 Ovary 2-celled. Woody plants, with opposite leaves. 



FRAXINUS, L. 

 Flowers dioecious. Calyx very small. Corolla absent. Fruit a 

 samara, winged at apex. Trees with pinnate leaves. Flowers in panicles 

 on the old wood. 



F. viridis, Michx. f. A small tree with glabrous twigs, or in var. 

 pitbescens, Hitchc, the twigs pubescent. Woods, common. 

 50. APOCYNACEAE. 

 Calyx and corolla 5-lobed. Stamens 5, inserted on corolla tube, 

 alternate. Ovaries 2, free from calyx. Plants with milky juice and 

 entire, opposite leaves. 



