ANALYTICAL KEY. 21 



000 ApetaloHS Division, with only one series of true floral envelopes page 



(corolla absent), or no envelopes. 

 * Flowers not in catkins. (* * bottom pa^o 22.) 



Ovary 2-6-ce lied, its cells coutoini mj mi inorous ovules — 



Six-celled, the tube of tliu ciilvx ((ihcrcuit with its surface or the 



lower part of it: lolxs ul ilic ralyx 3 . BIRTHWORT F. 372 

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



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

 Five-celled, tive-horued, 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. 1<)9 

 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: ttowers niimw- 



cious. Tree . . (Liqniilambar) \VIT('H-HAZEL F. 174 

 Ovary 1-2-celled, several-ovuled ou oin' side ot a liasal iilacc iita, 



(CuplHM) LOOSESTRIFE F. 177 

 Ovary or ovariesl-celled, icith numerous or several ovules, on parietal 

 placentse; calyx free — 

 Calyx of 2 sepals : placenta} 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 pliicenta, free from the calyx — 

 Flowers surrounded by dry scarious or colored bracts — 

 Pod opening by a transverse line above the base, 



AMARANTH F. 3()0 

 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 l-celled, with one or some- 

 times two or three ovules — 

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

 Woody or partly woody climbers by their leafstalks, 



(Clematis) CROWFOOT F. 34 

 Trees or shrubs, not climbinf/ — 



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

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

 Leaves pinnate, not aromatic nor pricklv: pistil one, 



(Fraxinns) OLIVE F. 279 

 Leaves simple, beset with silvery (rarely cojiperj^) scurf or 



scurfy down OLEASTER F. 377 



Leaves -tiniple, 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 

 iu a closed receptacle, which becomes pulpy, 



(Fig) FIG SUBF. 3S5 

 Not aromatic, and juice not milly: the leaves — 



Falmately lobed and veined, with sheathing stipules: 



no evident calyx . . PLANK TREE F. 389 

 Mostly toothed, feather- veined, sometimes also with 

 ril)s from the base : calyx free from the ovary, 



ELM SUBF. 384 

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



flowers perfect . . . MEZEREUM F. 37G 

 Entire (rarely toothed) : tube (f calyx coherent with 

 ovary : flowers dio'ciously p(dii(iamous — 

 Ovary and fruit pear-shapcti : siiiznia terminal, 



S.\N1>ALW00D F. 378 

 Ovary globular or oval : stigma running down 

 one side of the awl-shaped style. 



(Nyssa) DOGWOOD F. 205 



