ANALYTICAL KEY. 21 



OOO Apetalous Division, with only one series of true floral envelopes PAOB 



(corolla absent), or no envelopes. 

 * Flowers not in catkins. (* * bottom page 22.) 



Ovary 2-6-celled, its cells containing numerous ovules 



Six-celled, the tube of the calyx coherent with its surface or the 



lower part of it : lobes of the calyx 3 . BIRTHWORT F. 372 

 Four-celled, the tube of calyx coherent with its surface: lobes of 



calyx and stamens 4 (Ludwigia) EVENING PRIMROSE F. 179 

 Five-celled, five-horned, free from the calyx: stamens 10, 



(Penthorum) ORPINE F. 170 

 Three-celled, free from the calyx of 5 sepals white inside: 



stamens 3 ... (Mollugo) FIG MARIGOLD F. 199 

 Two-celled or four-celled, free from but inclosed in the cup- 

 shaped calyx: stamens 4, 



(Rotala Ammannia) LOOSESTRIFE F. 177 

 Two-celled, many pistils in a head: no calyx: flowers monos- 



cious. Tree . . (Liquidambar) WITCH-HAZEL F. 174 

 Ovary 1-2-celled, several-ovuled on one side of a basal placenta, 



(Cuphea) LOOSESTRIFE F. 177 

 Ovary or ovaries l-celled, with numerous or several ovules, on parietal 



placentse ; calyx free 



Calyx of 2 sepals : placentae 2 . . (Bocconia) POPPY F. 53 

 Calyx of 4 or more sepals : placenta 1 . . CROWFOOT F. 34 

 Ovary l-celled, with several or many ovules from the bottom or on a 



central placenta, free from the calyx 

 Flowers surrounded by dry scarious or colored bracts 

 Pod opening by a transverse line above the base, 



AMARANTH F. 360 



Pod splitting from the top ... KNOTWORT F. 369 

 Flowers not surrounded by dry or colored bracts 

 Stamens inserted at the base of the ovary, 



CHICKWEED SUBF. 73 



Stamens inserted on the calyx . . KNOTWORT F. 359 

 Ovary or separate (or separable) ovaries l-celled, with one or some- 

 times two or three ovules 



Woody plants, parasitic on trees, dioecious MISTLETOE F. 378 

 Woody or partly woody climbers by their leafstalks, 



(Clematis) CROWFOOT F. 34 

 Trees or shrubs, not climbing 



Leaves pinnate, aromatic, their stalks mostly prickly: pis- 

 tils more than one . . (Xanthoxylum) RUE F. 98 

 Leaves pinnate, not aromatic nor prickly: pistil one, 



(Fraxinus) OLIVE F. 279 

 Leaves simple, beset with silvery (rarely coppery) scurf or 



scurfy down OLEASTER F. 377 



Leaves simple, not silvery-scurfy 



Aromatic or spicy-tasted: calyx mostly corolla-like: 



anthers opening by uplifted valves LAUREL F. 375 

 Aromatic-scented: no proper calyx: anthers not open- 

 ing by valves ... . . . SWEET GALE F. 392 



Not aromatic: juice milky: stipules deciduous: flowers 

 in a closed receptacle, which becomes pulpy, 



(Fig) FIG SUBF. 385 

 Not aromatic, and juice not milky: the leaves 



Palmately lobed and veined, with sheathing stipules: 



no evident calyx . . PLANE TREE F. 389 

 Mostly toothed, feather- veined, sometimes also with 

 ribs from the base : calyx free from the ovary, 



ELM SUBF. 384 

 Entire: calyx corolla-like and free from the ovary: 



flowers perfect . . . MEZEREUM F. 376 

 Entire (rarely toothed) : tube of calyx coherent with 



ovary : flowers aiwci.ously polygamous 

 Ovary and fruit pear-shaped : stigma terminal, 



SANDALWOOD F. 378 



Ovary globular or oval: stigma running down 

 one side of the awl-shaped style, 



(Nyssa) DOGWOOD F. 205 



