CLASS XIX. ORDER II, V and VI. 99 



Order II. Diaxdria. 



Ctpripedium- Calyx coloured, 4-leavcdj spread- 

 ing : lip inflated, hollow : style with a terminal 

 lobe ; and a petal-like appendage on the upper 

 side. 7. 2 1 — fiubescens (yellow ladies' slipper) stem 

 leafy, style-lobe obtuse, shoe-form nectary shorter 

 than calyx. %. y. — spectabile (ladies' slipper) stem 

 leafy, style-lobe obtuse, nectary longer than calyx* 

 2;f . p — humile^ steinless, leaves radical. 2|. p. 



Order V. Pentandkia. 



AscLEPiAS. Follicles 2 : nectaries 5, concave, 

 containing a little horn : petals reflexed. 30. 47— 1 

 Stems simple, leaves opposite — syriaca, (milk- 

 weed, or silk-weed) leaves lance-oblong sharp dow- 

 ny beneath, umbels downy. 2/.w-p. — guadri/oHa, 

 four largest leaves near the middle of the stem. %. 

 vr-r. — fiurpurascens^ leaves ovate downy beneath, 

 nectaries upside down, umbels erect- 2/. p — obtw 

 sifoliay leaves clasping round-obtuse oval-oblong. 

 "2^, p. — Stem simple, leaves whorled or scat- 

 tered — verticillata.,\e3.vGS mostly whorled narrow- 

 linear. 2/.y-w. — tiiberosa^ leaves scattered lance- 

 oblong rough-haired. %. — incarnata^ stem branch- 

 ing, leaves lanceolate, hairy. 2/. r. 



Cyxanchum. Calyx 5 -toothed ; corol wheel 

 form : nectary cylindric, 5-toothed : follicles 2. 30. 

 47 — obliquum (choak-dog) twining, leaves cordate, 

 corymbs axillary, p. 



Order VI. Hexandria. 



Aristolochia. Calyx : corol superior, 1-pe- 

 talled, ligulate, inflated at the base i-^^^psule 6-cell- 

 ed, many-seeded. 11. 23 — serfientand (birth-wort) 

 stem zigzag, scaped, lips of corol lanceolate. %-^^ 



