ANALYTICAL KEY. 21 



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



(corolla absent), or no envelopes. 

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



Ovary 2-&-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 . BffiTHWORT 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 o (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 monoe- 



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 1-celled, ifith numerous or several ovules, on parietal 

 * placentae; calyx free 



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

 Calyx of 3 sepals : ovules scattered. ( Akebia) BARBERRY F. 49 

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

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



central placenta, free from the calyx ' 

 Flowers surrounded by dry scariou-s or colored bracts 



Pod opening transversely above the base AMARANTH F. 360 

 Pod splitting from the top ... KNOTWORT F. 359 

 flowers not surrounded by dry or colored bracts 

 Stamens inserted at the base of the ovary, . 



CfflCKWEED SUBF. 73 



Stamens inserted on the calyx . . KXOTWORT F. 359 

 Ovary or separate (or separable) ovaries I-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 . . (Xantboxylum) RUE F. 98 

 Leaves pinnate, not aromatic nor prickly : pistil one, 



(Fraxiniis) 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 



Palmatelvlobed 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 ovarv: 



flowers perfect . . . MEZEREUM F. 376 

 Entire {rarely toothed) : tube of calyx coherent with 



ovary : Jlowers dioztiously polygamous 

 Ovary and fruit pear-shaped : stigma terminal, 



SANDAL WOOD F. 378 



Ovary globular or oval: stigma running down 

 one side of the awl-shaped style, 



(Nyssa) DOGWOOD F. 205 



