315 



6. V. canadensis Linn. : leaves alternate, cordate-ovate, acuminate, 

 serrate, hispid on both sides ; panicles axillary, mostly in pairs, di- 

 varicately branched ; the lower ones sterile, and longer than the peti- 

 ole ; the upper ones fertile, elongated ; stem very hispid, stinging. 

 - HAB. Miry shaded grounds. Can. to Car. July, Aug. 2/. 

 Stem 56 feet high. Leflves ovate, large The fibres of this 

 species are very tough and strong, and it was formerly proposed 

 by Mr. Whitlow as a substitute for hemp. Canadian Nettle. 



2, PARIETARIA. Linn. 



Flowers polygamous, surrounded by a many-cleft involucre. 

 PERFECT FL. Perianth 4-cleft Stamens 4; filaments at 

 first incurved, then expanding with an elastic force. Ovary 

 I. Style 1. Nut 1, inclosed by the enlarged perianth. 



Monoecia. Tetrandria. 



P. pennsylvanica Muhl. : leaves oblong-lanceolate, veiny, with opake 

 dots ; involucre 3-leaved, longer than the flower. 



HAB. . Moist rocks. Penn. to Geor. June. 0. Stem 12 15 

 inches high, simple. Flowers in- compact axillary clusters. 



Pettitory. 



3. CANNABIS. Linn, 



Dioecious. STERILE FL. Perianth 5-parted. Stamens 

 5. FERTILE FL. Perianth oblong, opening at the side. 

 Styles 2. Nut 2-valved, covered with the closed perianth. 



Dioecia. Pentandria. 



C. saliva Linn. : leaves petiolate, digitate ; leafets 5 7, lanceolate, 

 serrate. 



HAB. In fields. June. 0. Apparently indigenous, but proba- 

 bly introduced. Common Hemp. Neck Weed. 



4. HUMULUS. Linn. 



Dioecious. STERILE FL. Perianth single, 5-parted. Sta- 

 mens 5. Anthers with 2 pores at the extremity.. FERTILE 

 FL. Scales of the ament large, persistent, concave, entire, 

 single flowered. Perianth none. Styles 2. Seed 1. 



Dioecia. Pentandria. 



H. lupulus Linn. 



HAB. Hedges, &c. Aug. If. Stem twining, scabrous. Leaves 

 opposite, 3 5-lobed, rough. Flowers greenish. Medicinal. 

 Big. Med. Bot. iii. 163. ' Common Hop. 



5. BOEHMERIA. Willd. 

 Monoecious. STERILE FL. Perianth 4-parted. Sta- 



