12 SPRING FLORA OF MANHATTAN. 



POLFGOXATUM, Adans. 



Perianth greenish, cylindrical, united, 6-lobe I at summit. Stamens 

 inserted on perianth. Fruit a globose berry. Stem from a creeping 

 fleshy rootstock. 



P. biflorum, var. cmnmidatum, (R. & S.) Morong. Stem i-1 m. high, 

 naked below. Peduncles axillary, few flowered. Rich woods. 



7. SMILACEAE. 

 SM1LAX, L. 



Flowers dioecious, small and greenish, in peduncled axillary umbels. 

 Fruit a black few seeded berry. Leaves netted veined, their petiole 

 bearing two tendrils 



<S. hispida, Muhl. A woody climbing vine; the stem, at least below, 

 armed with numerous black prickles. Low woods, common. 



8. IRIDACEAE. 



Divisions of perianth 6, colored. Stamens 3. Ovary inferior, 3- 

 celled. Leaves equitant. 



SISYRINCHIUM, L. 



Stamens monadelphous. Leaves grass-like. Roots fibrous. 



S. Bermudianum, L. Flower stem flat, 1-2 dm. high, bearing a few 

 slender pedicelled white or blue flowers. Prairie, common. 



DICOTYL.EDONEAE. 



9. JUGLANDACEAE. 



Flowers monoecious, the staminate in lateral catkins, the pistillate 

 single or in clusters terminating the growth of the season. Trees with 

 pinnate leaves. 



JUG LANS, L. 



Fruit with an indehiscent sppngy covering. Pith diaphragmed. 



J. nigra, L. Leaflets 7-11 pairs. Twigs downy. Low woods, 



frequent. 



IIICORIA, Raf. 

 Covering of fruit splitting from apex into four parts. Pith without 

 diaphragms. 



H. ovata, (Mill.) Bntton Leaflets mostly 5, lower pair much smaller. 

 Bud scales several, Bluffs along river below Manhattan. 



H. minima, (Marsh) Britton. Leaflets mostly 7-9. Bud scales 2, 

 yellow. Low woods, common. 



lO. SALICACEAE. 

 Flowers dioecious, both kinds in catkins. Trees or shrubs with 

 alternate, simple leaves. 



POPULUS, L. 

 Scales of catkins cut-lobed. Flowers from a cup-shaped disk. Trees 

 with broad leaves. 



P. monilifera, Ait. Leaves broadly ovate with a slender point, on a 

 flattened, slender petiole, serrate. Low ground, common. 



SALIX, L. 

 Scales of catkins entire. No disks. Leaves long and pointed, ours 

 with serrate leaves. 



