20 ANALYTICAL KEY. 



Pistils 2 as to their ovanes, these making many-seeded pods, but »'agb 

 stiffmas 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 

 Pistil 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 1-celled, 1-seeded, 



(Mirabilis) FOUR-O'CLOCK F. 358 

 Stamens on the receptacle, or nearly so : ovary 5-ceIled : pod 



niany-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 : berry-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 : ovary and pod 2-celled, several-seeded, 



LOGANIA F. 290 

 All opposite or whorled and entire, ivithoitt stipules: 

 ovary and pod 1-celled, several-muny-seeded : 

 placentas parietal — 

 Juice milky : leaves short-petioled, 



(Allamanda) DOGBANE F. 283 

 Juice not milky, bitter : stem leaves sessile, 



GENTIAN F. 291 

 Alternate or some opposite, loithout stipules : ovary 

 and pod l-cdled. id.th 2 parietal placentse — 

 Smootli 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 : style 2-cleft, 



WATERLEAF F. 298 

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

 stamens 4 : style not 3 -cleft, 



VERVAIN F. 339 

 Opposite or alternate, simple or compound, without 

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

 stamens 5 : style 3-cleft at the apex, 



rOLEMONIUM F. 295 

 Alternate, pinnate and tendril-bearing, lowest leaf- 

 lets imitating leafy stipules, 



■(Cobsea) POLEMONIUM F. 295 

 Alternate, at least not opposite, tvithout stipules : 

 sta)nens 5, rarely 4: ovary.2-5-celled — 

 Four cells of the ovary 1-ovuled : fruit splitting 

 into little nutlets : flower-clusters coiled, 



(Heliotrope) BORAGE F. 301 

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

 seeds large : mostly twiners, 



CONVOLVULUS F. 306 

 Two or rarely more many-ovuled cells : seeds 

 numerous — 

 Styles 2, or rarely 3, or 2-cleft, 



WATERLEAF F. 298 

 Style and stigma only one, 



NIGHTSHADE F.. 311 

 Leaves none : leafless parasitic twiners, destitute of 



green herbage .... DODDER SUBF. 730 



