20 ANALYTICAL KEY. 



Pistils 2 as to their oi'aries, these making many-seeded pods, but 



stigmas and often styles also united into one 

 Pollen powdery and loose, as in ordinary plants, not in 



masses . . . . . . DOGBANE F. 283 



Pollen all in waxy or granular masses, usually 10, and fixed 



in pairs to 5 glands of the stigma . MILKWEED F. 286 

 one, with a single compound ovary which is not divided 

 nor deeply lobed 



Stamens on the receptacle, or lightly cohering above with 

 what seems to be the corolla: ovary l-celled, 1-seeded, 



(Mirabilis) FOUR-O'CLOCK F. 35b 

 Stamens on the receptacle, or nearly so : ovary o-celled : pod 



many-seeded ...... HEATH F. 262 



Stamens borne on very base of the 4-8-parted corolla: the 

 cells of the ovary just as many, one ovule in each: no 

 style : berrv-like fruit containing as many little stones, 



HOLLY F. 102 

 Stamens plainly borne on the corolla 



Leaves all radical, 1-7-ribbed: flowers in a spike: co- 

 rolla thin and becoming dry : stamens 4 : style and 

 stigma one : pod 2-celled, rarely 3-celled, opening 

 transversely .... PLANTAIN F. 356 



Leaves on the stem 



All opposite and entire, their bases or petioles con- 

 nected by small stipules or a transverse stipu- 

 lar line : 'ovarv and pod 2-celled. several-seeded, 



LOGANLA. F. 290 



All opposite or ichorled and entire, without stipules: 

 ovary and pod l-celled, several-many-seeded : 

 place ntie parietal 

 Juice milky : leaves short-petioled. 



(Allamanda) DOGBANE F. 283 

 Juice not milky, bitter: stem leaves sessile, 



GENTIAN F. 291 

 Alternate or some opposite, irithout stipules: ovary 



and pod l-celled with "2 parietal placentae 

 Smooth marsh or water plants : leaves round- 

 heart-shaped, entire, or of 3 entire leaflets, 



GENTIAN F. 291 



More or less hairy plants : leaves mostly toothed 

 or divided: stvle 2-cleft. 



AYATERLEAF F. 298 



Opposite, no stipules: ovary 4-celled, 4-ovuled: 

 stamens 4 : stvle not 3 -cleft, 



VERVAIN F. 339 



Opposite or alternate, simple or compound, without 

 stipules, not twining: ovary and pod 3-celled: 

 stamens o : style 3-clef t at the apex, 



FOLEMONIUM F. 295 



Alternate, pinnate and tendril-bearing, lowest leaf- 

 lets imitating leafy stipules, 



(Got**) POLEMONIUM F. 296 

 Alternate, at least not opposite, without stipules: 



stamens o, rarely 4: ovary 2-^-cfl'- 

 Four cells of the ovary 1-oviiled : fruit splitting 

 into little nutlets : flower-clusters coiled. 



'Heliotrope) BORAGE F. 301 

 Two or three 2-ovuled or four 1-ovnled cells: 

 seeds large: mostly twiners, 



CONVOLVULUS F. 306 

 Two or rarely more many-owled cells: I89d 



Stvles '2. or rarelv 3, or 2-cleft. 



WATERLEAF F. 208 

 Style and stigma onlv one. 



NIGHTSHADE F. 311 

 Leaves noue: leafless parasitic twiners, destitute of 



green herbage .... DODDER SUBF. 730 



