ANALYTICAL KEY. 21 



000 Apetalous Division, with only one series of true floral envelopes pagb 



(corolla absent), or no envelopes. 

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



Ovary 'b-§-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 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, with numerous or several ovules, on parietal 

 placentas; calyx free — 

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

 Calyx of 4 or more sepals: placental . . CROWFOOT F. 34 

 Ovary 1-celled, with several or many ovules from the bottom or ore o 

 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. 359 

 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 1-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 diosciously 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 



