262 27. Buxus. 10. EUPHORBIACE^. Pl.ex.mon, 



Buxus semperuirens. Evergreen lox. 



Leaves ovate ; edge of the petiole rather hairy ; anthers 



ovate, arrowshape. 



Buxus, Raii Syn. 445, I j Ger. em. 1410. 

 Buxus arbor vulgaris, Park. 1428. 

 Buxus sempervirens, Lin. S. P. 1 394. 



Chalky hills; arborescent; April. 



Tree low, bald ; leaves often nicked, shining ; Jlowers 

 yellowish. — Wood yellowish, very hard, smooth and tough; 

 also sudorific j leaves cathartic and vermifuge. 



/3. angustifolia. Stem arborescent; leaves lanceolate. 



Buxus angustifolia, Raii Syn. 445, 2. 



y. sulfruticosa. Stem low, rather shrubby ; leaves 

 small, reverse ovate. 



Fam. XI. 11. ARISTOLOCHI^. Jussieu. 



Perigonium simple, adherent, 1 -leafed, 1-sepaled, few- 

 lobed, semi-petaloid ; aestivation valvular ; stamens definite 

 6 or 12, epigynoiis, sessile; style short; stigma many-iobed; 

 carcerule coriaceous, 6 or 8-celled ; dissepiments vertical ; 

 placentarium axillary ; seed horizontal or ascending; cor- 

 culum small, cordate, hidden, basilary ; perisperm hornj'-, 

 radicle below. 



Perigonium tubular, apex ligulate . . Aristolochia. 28. 

 Perigonium campanulate, 3-lobed Asarum. 29. 



I. 28. ARISTOLOCHIA. Dioscorides. BirthworL 



Ptrigonium tubular, bellied at bottom, dilated at top, 

 ligulate ; stamens 6, on the style ; filaments very short, bear- 

 ing the anther on one side ; style very short, thick ; stigma 

 6-cat ; carcerule 6-ceiled, dissepiments membranaceous, 

 not 2-partile ; seeds horizontal, incumbent, flat, not mar- 

 gined, winged below. — St(m volubile or erect; leaves alter- 

 nate, pedately veined; stipule 0; Jlowers axillary. 



Aristolochia infcsta. Troublesome lirthwort. 



Leaves petiolate, roundish, heartshape, rather h\mi\. ; stem 

 upright; peduncles 1 -flowered, aggregate; perigonium up- 

 right ; lip oblong. 



Aristolochiii Sararenica, fJ/^r.ew. 847,4. 

 Arrstolocliia Clpmatiti;, Lin. S. t* I3fi4. 

 Aristolochia infesta, Saliab. Prod,2\b, 

 Saracen s Birthwort. ^ 



2 



