PLATANACEtfl. 201 



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6. PIL'EA, Lindl. RICHWEED. GLEAKWEED. 

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

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

 7. IKIJIMI: 1:1 1. Jacq. FALSE NETTLE. 



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

 Leaves ovate-oblong or ovate-lanceolate, 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. CAN' tf AIMS, Tourn. HEMP. 



C. sati'va, L. (HEMP.) Common everywhere along road- 

 sides and in waste places. 



10. Ill Ml MS, L. HOP. 



H. Lu'pulus, L. (COMMON HOP.) A twining perennial. 

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

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

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

 hop its taste and smell. 



ORDER LXXXV. PLAT ANA' CE^E. (PLANE-TREE F.) 

 Represented only by the Genus 



PLAT' ANUS, L. PLANE-TRHE. BUTTONWOOD. 



P. OCeidenta'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 : stipules 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. 



