PLATANACE-E. 201 



6. PIIi'EA, Lindl. Eichwjsed. Clkakweed. 

 P. pu'mila, Gray. Stem 3-18 inches high. Leaves ovate, 

 coarsely-toothed, 3-ribbed. — Cool moist places. 



7. B(EH!tIE'RIA, Jacq. False Netixe. 



B. eyUn'driea, Willd. Stem 1-3 feet high, smoothish. 

 Leaves ovate-oblong or ovate-lanoeolate, serrate, 3-nerved, 

 long-petioled. Stipules separate. — Moist shady places. 



8. PARIETA'RIA, Tourn. Pellitory. 

 P. Pennsylvan'iea, Muhl. A low annual, simple or 

 sparingly branched, minutely downy. Leaves oblong-lance- 

 olate, thin, veiny, roughish with opaque dots. — Usually in 

 crevices of limestone rocks ; not very common. 



9. t'AN'NABIS, Tourn. Hemp. 



C. sati'va, L. (Hemp ) Common everywhere along Toad- 

 sides and in waste places. 



10. IIIJ'9IVLIIS,'L. Hop. 

 H. Lu'pulUS, L. (Common Hop.) A twining perennial. 

 Leaves hear|-shaped, mostly 3-5-lobed, petioled. Calyx of 

 fertile flower a. single sepal. In fruit the calyx, achene, 

 etc. , sprinkled with yellow resinous grains, wliich give the 

 hoji its taste and smell. 



Order LXXXV. PLATANA'CEiE. (Plane-tree F.) 



Represented only by the Genus 



PLAT' ASUS, B. Plame-tkhe. BurroNWOOD. 



P. OCCidenta'lis, L. (American Plane-tree or Sycamore.) 

 A fine large tree found in south-western Ontario. Leaves 

 alternate, rather scurfy when young, palmately-lobed or 

 angled, the lobes sharp-pointed : stipidea sheathing. Flow- 

 ers monoecious, both sterile and fertile ones in catkin-like 

 heads, without calyx or corolla, but with small scales inter-' 

 mixed. Ovaries in the fertile flowers club-shaped, tipped 

 with the thread-like simple style, and downy at the base. 

 Fertile heads solitary, on slender peduncles. The white 

 bark separates into thin plates. 



