KEY TO THE FAMILIES AND GENERA 



81 



Cohort J. PoLYGALALES. Stamen:s ii.s many or twice as many 

 as petals: carpela usually 2: ovary usually perfectly or imperfectly 

 2-celIed, usually compressed. 



A. Fls. regular or slightly oblique. 

 B. Stamens 5, as many aa sepals or 



petals: woody 23. PiTTOSPonACE.E, 



BB. Stamens twice as many as sepals or 

 petals, which are usually 4 or 5, 



rarely 3: woody 24. Tremandrace-e. 



AA. Fls. irregular: herbaceous or woody. . . .25. Polygalace^. 



Cohort 4. Caryophyll.\les. Stamens definite, rarely oo : 

 ovary 1-ceIled or imperfectly septate; placenta central, rarely 

 parietal: embryo curved, or coiled, rarely straight. 



A. Sepals of game number as petals: 



placenta 1, central: herbs 26. Cahyophyllace.e. 



AA. Sepals fewer than petals: placenta 1, 



central: herbs 27. PoRTULACACEiE. 



AAA. Sepals of same number as petals: 

 placentie several: mostly woody. 

 B. Corolla polypetalous; stamens with- 

 out scale, glabrous; fls. spicate or 



racemose 28. Tarl\ricace/e. 



BB. Corolla gamopetalous; stamens with 

 scale, hairy; fls. thyrsoid-panicu- 

 late 29. Fotjquieriace^. 



Cohort S. GnTTiFERALES. Stamens usually co; sepals imbri- 

 cated; ovary septate; placentse on the inner angles of the cells, i.e., 

 axile. (See also, as exceptions with disk absent, the Linacese, 

 Erythroxylaceae. Malpighiaceee, Geraniacese, Tropseolacese, Lim- 

 nanthaceae, OsalidaceEe, Balsaminacesp, Ochnaceae, Rutacese, Ana- 

 cardiacefe and Sapindaceae, all belonging to the Disciflorse. (See 

 also Nigella of the Ranunculacese.) 



A. Lvs. opposite or whorled, herbaceous: 



fls. cymose or panicled, bisexual 30. Hypericace.e. 



AA. Lvs. opposite or whorled, coriaceous: 

 fls. cymose or panicled. 

 B. Receptacle not enlarged; fls. uni- 

 sexual 31. GUTTIFER.E. 



BB. Receptacle enlarged, barrel-shaped 

 between pistil and corolla, bearing 



the stamens; fls. bisexual 32. Eucryphiace.g. 



AAA. Lvs. alternate, coriaceous: fls. mostly 

 racemose. 

 B. Cells of ovary 2-10: stamens numer- 

 ous 33. Teknstbcemiace.e. 



BB. Cells of ovary 1 : stamens 8 ' . . . 34. Stachyuh ace-e. 



Cohort 6. Malvales. Stamens usually <» or monadelphous ; 

 Bepais valvate: ovary septate; placentae axile. 



a. Anthers l-celled; pollen rough: herbs 



or woody 35. Malvaceae. 



AA. Anthers 1- to several-celled; pollen 



smooth: woody plants 30. Bombacace-e. 



A**- Anthers 2-celled: fls. with staminodia 

 and queer stamen-tube: woody 



plants 37. STERcnuACE.E. 



AAAA. Anthers 2-celled; stamens nearly free; 

 no staminodia: o\'ule often pendulous 

 with raphe toward axis. 



B. Petals ordinary: herbs or woody 38. Tiliace.e. 



BB. Petals firm, often hairy or incised: 



woody plants 39. El^ocarpacej!:. 



Anomalous Group. Stamens co ; sepals 

 valvate: carpel 1; ovary l-celled: fls. reg- 

 ular: lvs. compound: herbs or woody 



(Alimoesse, inch in Leguminosae. ) 



Series 2. Disciflor-e. Calyx usually inserted under the ovary; 

 petals in 1 series: stamens usually definite, inserted within or upon 

 or around the receptacle, which is usually expanded as a disk within 

 the calyx: ovary usually free, or imbedded in the disk. (See Fla- 

 courtiacese and Trapaceae.) 



Cohort 1. Geraniales. Disk usually a ring between stamens, 

 or adnate to staminal lube, or reduced to glands alternating with 

 the petals, rarely 0: ovary commonly lobed, rarely entire or sub- 

 apocarpous; ovules 1-2 in each cell, pendulous; raphe toward axis. 

 (See StaokhousiaceEB.) 



A. Ovary more or less lobed or grooved. 



B, Anthers elongated; disk enlarged in 



f r 51. OCHNACE<E, 



BB. Anthers normal. 



c. Calyx-lobes 5, all or mostly with 2 



glands outside : woody 42. Malpighiace^. 



cc. Calyx-lobes not biglandular- 



D. Foliage glandular-dotted: car- 

 pels sometimes separate 49. Rctaceje. 



DD. Foliage not glandular-dotted. 

 E. Lvs. usually opposite, com- 

 pound 43. Zygophyllace*. 



EE. Lvs. alternate. 



¥. Disk well developed, irregu- 

 lar; petal.-* often irregular; 

 ovary usually open above: 

 herbs, rarely shrubs. 

 (See No. 18, Resedacea.) 



6 



FP. Disk well developed, regu- 

 lar; petals regular: ovary 



closed: woody plants 50. Simardbace.e. 



FFF. Disk indistinct, otherwise 

 as in the last: herbaceous. 

 G. Ovule sohtary: stamens 

 6-10. 

 H. Fr. dehiscent: stamens 

 connate at base; fls. 

 regular or irregular. .44. Geraniace.e. 

 HH. Fr. indehiacent: sta- 

 mens free: fls. irregu- 

 lar: ovule pendulous..45. Trop.eolace.e. 

 HHH. Fr. indehiscent: sta- 

 mens free: fls. regu- 

 lar: ovule ascending.. 46. LimnanthacejE. 

 GO. Ovules several: fr. dehis- 

 cent. 

 H. Stamens 10: fls. regu- 

 lar 47. 0XALIDACE.G. 



HH. Stamens 5: fls. irregu- 

 lar 48. Balsaminace*. 



AA. Ovary entire. 



B. Stamens monadelphotis, at least 

 below : woody plants, 

 c. Stamen-tube stipitate; disk vari- 

 ous 53. Meliace.e. 



cc. Stamen-tube sessile ; disk 0. 



D. Petals not appendaged: fr. cap- 

 sular 40. LiNACE-B. 



DD. Petals appendaged: fr. drupace- 

 ous 41. Erythroxylacejb. 



BB. Stamens free. 



c. Ovules several or many. 



D. Mostly herbaceous plants. (See 

 No. 17, Capparidace£e.) 

 DD. Woody plants. (See No. 22, 

 Flacourtiaceae.) 



cc. Ovules 1-2 52. BURSERACEiE. 



Cohort 2. Olacales. Disk cup-shaped or ring-shaped, free, or 

 bearing the stamens and petals on its edge: ovary 1-co-celled, 

 entire; ovule solitary, pendulous; raphe away from axis. 



A. Petals or corolla-lobes usually valvate: 



woody 54. Olacace,e. 



AA. Petals or corolla-lobes imbricate or 

 convolute. 

 B. Fr. drupaceous, slightly fleshy, 3-18- 

 stoned ; stones 1 -seeded : fls. not 



racemose; woody 55. Aqcifoliace.e. 



BB. Fr. crustaceous or spongy, 2-4- 

 celled, 1-4-seeded: fls. racemose: 

 woody 56. Cyrillace*. 



Cohort 3. Celasthales. Disk tumid or adnate to the calyx 

 or covering its base: stamens inserted around the disk or affixed to 

 its margin; ovary usually entire; ovules usually 2 in each cell, erect: 

 raphe turned toward axis; lvs. simple or rarely compound. 



A. Calyx valvate; petals small, concave; 



stamens opposite the petals: woody,. ..59. Rhamnace-e. 

 AA. Calyx imbricate. 



B. Stamens alternate with the petals, 

 the latter imbricate, 

 c. Petals spreading: calyx small: 



woody 57. Celastrace.e. 



CO. Petals erect, often connate: calyx- 

 tube hemispherical: herbs 58. Stackhousiace.«; 



BB. Stamens opposite the petals, the lat- 

 ter valvate, dropping off early: 



woody, rarely herbaceous 60. VitacejE. 



(Inch Leeaceae.) 



Cohort 4. Sapindales. Disk various; stamens variously 

 inserted on the disk: ovary entire, or more often lobed, or suba- 

 pocarpus; ovules commonly 1-2 in each cell, ascending, with raphe 

 toward axis, or reversed, or solitary and pendulous from an ascend- 

 ing funicle. rarely Qo and horizontal: lvs. pinnate, rarely simple 

 (No. 62), or (No. 65) digitate. 



A. Carpels 2: fr. a samara 62. AcEHACEiE. 



AA. Carpels 2-3: fr. a drupe, 1-seeded.. .... 61. Sabiace-b. 



AAA. Carpels 3-5: fr. rarely samaroid in 

 Sapindaceie. 

 B. Bark containing resin: disk intra- 



staminal ._ .67. Anacardiace.b. 



BB. Bark not resinous, or, if so, disk 

 extrastaminal. 

 c. Endosperm abundant; embryo 

 straight. 

 D. Disk intrastaminal; carpels 3. . ..63. Staphyleace,e. 

 do. Disk extrastaminal; carpels 4-5.-64. Melianthace.e, 

 cc. Endosperm sparse or wanting; 

 embryo curved: disk extra- 

 staminal. (See Sapindaceffi, 

 No. 66.) 

 d. Lvs. opposite, palmately com- 

 pound 65. HlPPOCABTA- 



DD. Lvs. alternate,, variously com- |nace.«. 



pound, or simple 66. Sapindace«, 



