12 Spring Flora of Ohio. 



35. Ovary 1-celIed ; style and stigma single and entire; anthers open- page 



ing by uplifted valves Latiracea. 49 



35. Ovary, etc., as in the last ; anthers opening longitudinally. .. 7"/jjw/«/tt'af(?^. 85 



36. The fruit a winged samara or a drupe Ulmacea. 35 



31). The calyx becoming fleshy or juicy in fruit Moracece. 36 



36. The fruit a woody, 2-beaked capsule Hamamelidacecs. 59 



37. Ovary 6-celled ; stamens 6-12 Aristolochiaceer. 37 



37. Ovarj' 2-ceUed, 2-beaked : calyx absent; tree.... Haviamelidacees. 59 



37. Ovaries 2 or more, separate, simple Ranunculacece. ?9Vi 



38. Ovary 3-celled and 3-valved Aizoidacea .. 37 



38. Ovary 2-celled, 2-beaked ; caly.x absent ; tree Hatnamelidaceer. .59 



38. Ovary 2 or li-celled ; placentas central; caly.x present 39). 



38. Ovary l-celled, with 1 parietal placentas Ranunciilacea;. W4 



39. Stamens inserted on the calyx-tube Lythracea. 85 



39. Stamens on the receptacle or base of the calyx Caryopliyllacea:. 38 



POLYPETALOUS GROUP. 



4(J. Stamens more than 10; more than twice the number of petals i42). 



40. Stamens not more than twice the number of petals (41). 

 41. Stamens of the same number as, and opposite the petals (53). 

 41. Stamens alternate with the petals or of a different number 56 . 



42. Calyx entirely free from the pistil or pistils (43 . , 



42. Calyx more or less coherent with the compound ovary 52 . 



43. Pistils numerous but cohering over each other in a solid 



mass or on an elongated receptacle Magnoliacccr. 41 



43. Pistils separate but concealed in a hollow receptacle, leaves 



alternate, with stipules ; . .Rusacecc^ (iO 



43. Pistils like the last, leaves opposite, exstipulate Calycaulhaccir. 49 



43. Pistils separate, not enclosed in the receptacle 44 . 



43. Pistils with their ovaries cohering in a ring around the 



axis Malvacea. 81 



43. Pistils but one as to the ovary ; styles or stigmas may be several 47 . 



44. Stamens distinct, inserted on the caly.x Rosacea- . 60 



44. Stamens united by their filaments, and with the base of the 



petals Malvacccc. 81 



44. Stamens in.serted on the receptacle 45 . 



45. Filaments much shorter than the anthers; trees Anonacetr. 42 



45. Filaments longer than the anthers 46 . 



46. Leaves peltate ; petals persistent \ymf>lucaceiT. 41 



46. Leaves not peltate; petals deciduous RuniDintlacecr. ?**■*? 



47. Leaves punctate under a lens, with transparent dots ..Hypcricacecc. 81 



47. Leaves not punctate with transparent dots (48). 



48. Ovary simple, l-celled, 2-ovuled Rusacetr. (iO 



48. Ovary simple, l-celled, mauy-ovuled, placenta parietal 49. 



48. Ovary compound, l-celled, placenta central Porlitlacacecr. 38 



48. Ovary compound, l-celled, placentas 2 or more, parietal .50 . 

 48. Ovarj' compound, several-celled (51). 



49. Leaves 2-o-ternately decompound or dissected Rauunculaci-ic. ftiV.^ 



49. Leaves peltate and lobed Berbcridacccc. 48 



