433 
FLATANACEJ2. (PLANE-TREE FAMILY.) 
Order 106. PLATANACEiE. (Plane-tree Family.) 
Trees, with watery juice, alternate pabnately-lobed leaves, 
sheathing stipules, and monoecious flowers in separate and 
naked spherical catkins, destitute of calyx or corolla ; the 
fruit club-shaped 1 -seeded nutlets, furnished with bristly 
down along the base : consists only of the genus 
I. PLAIASTITS, L. Plane-tree. Buttonwood. 
Sterile flowers of numerous stamens with club-shaped little 
scales intermixed: filaments very short. Fertile flowers in sepa¬ 
rate catkins, consisting of inversely pyramidal ovaries mixed with 
little scales. Style rather lateral, awl-shaped, or thread-like, sim¬ 
ple. Nutlets coriaceous, small, tawny-hairy below, containing a 
single ortbotropous pendulous seed. Embryo in the axis of thin 
albumen. (The ancient name, from nXarbs, broad, in allusion to 
the ample shade of its foliage.) 
1. P. occidentalism L. (American Plane or Sycamore ) 
Leaves angularly sinuate-lobed and toothed, the short lobes sharp- 
pointed; fertile heads solitary, suspended on a long peduncle. — Allu¬ 
vial river-banks, very common, especially westward. May. — A very 
large and well-known tree, with a white bark separating early in thin 
brittle plates. Leaves woolly when young, soon smooth. Nutlets 
falling away from the globular receptacle in the spring of the second 
year, and widely scattered by means of the pappus-like down. 
Order 107. URTICACEJE. (Nettle Family.) 
Plants with moncecious or dioecious flowers , furnished 
with a regular calyx Jr ee from the 1-celled (rarely ^celled) 
ovary which forms a l-sceded utricle or achenium in fruit , 
the embryo not curved around albumen. Stamens as many 
as the lobes of the calyx and opposite them. Comprising 
several very distinct suborders, as 
Suborder I. MORE^E. The Mulberry Family. 
Trees or shrubs, with milky or yellow juice, alternate leaves with 
eci nous stipules convolute in the bud, and the flowers spiked on (or 
me osed in) a receptacle, becoming succulent in fruit. Styles or stig- 
™ 3S * ee< ^ am phitropous, with a curved embryo in copious albumen. 
orus. Flowers spiked. Calyx berry-like in fruit. 
