SPECIES AND VARIETIES. 317 



der peduncles nearly as long as the leaves ; females 2-3 toge- 

 ther in the axils of the leaves, usually on separate plants. — 

 Cultivated and waste places. Fl. August, September. 



(265) Aristolochia. Birth wort. 



A. Clematitis ; stems erect, simple, 1^ foot high, smooth ; 

 leaves broadly cordate ; flowers axillary, clustered, yellow, the 

 tube slender with an oblique mouth. — Stony, rubbishy places, 

 naturalized. Fi. July, August. 



(266) Paris. Herb Paris. 



P. quadrifolia : stems |-1 foot high, with a whorl of four 

 broadly-ovate or obovate leaves at top; perianth yellowish- 

 green, stalked, the four outer segments narrow-lanceolate, the 

 four inner ones linear and rather more yellow ; berry bluish- 

 black. — Woods and shady places. Fl. May, June. 



(267) Tamus. Black Bryony. 



T. communis : stems slender, smooth, twining to a consi- 

 derable length over hedges and bushes ; leaves shining, heart- 

 shaped, with a tapering point ; flowers small, yellowish-green, 

 the males in slender often-branched racemes, the females in 

 short close racemes; berries scarlet. — Hedges, open woods, 

 and bushy places. Fl. June. 



(268) Acorus. Sweet Flag. 



A. Calamus : aquatic, leaves highly aromatic, linear, erect, 

 2-3 feet long; flowering-stem simple, erect, the long linear 

 leaf- like spathe forming a flattened continuation ; spike sessile, 

 appearing lateral, cylindrical, very dense, yellowish-green. — 

 Sweet Sedge. — Edges of lakes and streams. Fl. June. 



