KEY TO THE FAMILIES AND GENERA 



97 



i>. Cells of the ovary as many as styles, 



each with 2 ovules. 



E. Ovary 2-celled: fr. 1-2-seeded, 

 black: fls. in upright racemes, 

 sometimes panicled: Ivs. evergreen . 30. Raphiolepis. 

 EE. (Wary 3-5-celled: fis. in umbels: Ivs. 



deciduous.. 31. Pyrus. 



DD. Cells of the ovary twice as many as 



styles, each with 1 ovule. 

 E. Styles usually 5; fls. in racemes: Ivs. 



serrate, or crenate at the apex 32. Amelan- 



EE. Styles 2-3; fls. in few-fid, umbels; [c/u'er. 



calyx-tube cylindric: Ivs. entire or 



denticulate, narrow 33. Peraphnl- 



[lum. 



5. Kerria Tribe. 



A. Petals wanting; fls. in few-fld. corymbs: 



achenes 2-5, drupaceous 34. Neviusa. 



AA. Petals present; fls. solitary, large. 



B. Lvs. alternate: fls. 5-merous, yellow: 



achenes drupaceous, yellow 35. Kerria. 



BB. Lvs. opposite: fls. 4-merous, white: achenes 



dry, black 36. Rhodotypus. 



6. Potentilla Tribe. 



A. Style deciduous, 

 a. Receptacle in fr. much enlarged, colored. 



c. Fls. white: receptacle pulpy, juicy 37. Fragaria. 



cc. Fls. yellow: receptacle dry 38. Duchesnea. 



BB. Receptacle not fleshy, even in fr. 

 c. Pistils only 1-12. 



D. Stamens 5; petals minute 39. Sibbaldia. 



DD. Stamens numerous; petals conspicuous. 40. Waldsteinia. 

 cc. Pistila very numerous. 



D. Petals white or yellow, obtuse or emar- 



ginate 41. Potentilla. 



DD. Petals purple, abruptly acuminate, 



much smaller than calyx 42. Comarum. 



AA. Style elongated after anthesis, often plumose. 

 B. Fls. 5-merous: Ivs. pinnate or pinnatifid. 



c. Sepals yalvate; hypanthium flat: herbs. .43. Geum. 

 cc. Sepals imbricate; hypanthium concave: 

 shrubs. 



D. Calyx with bracts outside 44. Fallugia. 



DD. Calyx without bracts 45. Cowania. 



BB. Fls. 8-9-merous: Ivs. undivided: prostrate 



undershrub 46. Dryas. 



7. Rubus Tribe. 



A. Drupelets pulpy 47. Rubus. 



AA. Drupelets nearly dry, inclosed by calyx 48. Dalibarda. 



8. Cercocarpus Tribe. 



A. Fls. apetalous; style elongated and plumose 



in fr.; hypanthium tubular 49. Cercocarpus. 



AA. Fla. with petals. 



B. Style with terminal stigma: Ivs. linear, 



needle-shaped 50. Adenostoma. 



BB. Style with decurrent stigma. 



c. Lvs. 3-fid at the apex: sepals imbricate: 



fr.inclqsed about half 51. Purshia. 



cc. Lvs. bipinnate: sepals valvate: fr. in- 



closea 52. Ckamxbatia. 



9. Ulmaria Tribe. 



Herbs with large pinnate Ivs. and large stipules 



and small white or pink fls. in large panicles. . ..53. Filipendula. 



10. Sanguisorba Tribe. 



A. Calyx with 5-6 bracelets or 10-12-cut in 2 

 series or in Agrimonia with a setose limb. 



B. Petals 54. 



BB. Petals 4 or 5 55. 



AA. Calyx without bractlets; petals 0: Ivs. pinnate. 



B. Fls. axillary, solitary 56. 



BB. Fls. spicate or capitate. 



c. The calyx valvate; stamens 1-10, short; 



carpels 1-2 57. 



cc. The calyx imbricate. 



D. Fr. rarely rugose: fls. usually bisexual; 



carpel 1 ; stamens 4-12 58. 



DD. Fr. often rugose: fls. polygamo-dice- 

 cious, rarely bisexual; carpels 2; 

 stamens CD 59. 



Alchemilla. 

 Agrimonia. 



Margyri- 



[carpus. 



Acaetia. 



Sanguisorba. 



Poterium, 



11. Rose Tribe. 



A A. Sepals 5. 



B. Carpels solitary. 



c. Style terminal: lys. usually serrate: pith 



of branches solid 62. Prunua. 



cc. Style lateral: Ivs. entire: pith lamellate.. 63. Prinsepia. 

 BB. Carpels 5: Ivs. entire 64. Osmaronia. 



13. Chrysobalanus Tribe. 



Anthers small, short, didymous; ovary 1-loculed, 

 inserted in the base of the calyx-tube; stamens 



15 or more 65. Ckrysobal~ 



[anus* 

 The genus Plagiospermum is also cultivated. 



72. SAXIFRAGACE^E. 

 /. Summary of Tribes. 



A. Plants are trees or shrubs. 



B. Lvs. opposite 1. HYDRANGEA TRIBE. 



BB. Lvs. alternate. 



c. Stipules absent: Ivs. often coria- 

 ceous or glandular-serrate: sta- 

 mens usually isomerous with 



petals 2. ESCALLONIA TRIBE. 



cc. Stipules absent or adnate to petiole 

 at base: fls. generally racemose; 

 ovary 1-locular, 2-merous; seeds 



immersed in pulp 3. RISES TRIBE. 



AA. Plants are herbs. 



B. Fls. 4-merous 4. FHANCOA TRIBE. 



BB. Fls. generally 5-merous 5. SAXIFRAGE TRIBE. 



II. Key to the Tribes. 



1. Hydrangea Tribe. 



A. Ovary superior. 



B. Number of petals 4; stamens 10; filaments 



2-lobed; styles 3 1. Fendlera. 



BB. Number of petals 5 or 6. 



c. Ovules solitary: stamens 4-12; styles 3-5. 2. Whipplea. 

 cc. Ovules 4 : stamens 15; carpels2, separate. . 3. Lyono- 

 ccc. Ovules numerous. [thamnus. 



D. Petals 5, convolute: stamens 10; styles 



3-5 4. Jamesia. 



DD. Petals 5 or 6, imbricate: stamens nu- 

 merous; style 1, with a 5-7-lobed 



stigma 5. Carpenteria. 



AA. Ovary inferior or semi-superior. 

 B. Stamens 8, 10 or 12. 



c. Petals induplicate or imbricate: fr. cap- 



sular 6. Deutzia. 



cc. Petals valvate. 

 D. Fr. a caps. 



E. Styles 4 or 5, free or connate at the 



base; petals 4 or 5 7. Hydrangea. 



EE. Style 1, with a 4-5-lobed stigma; 



petals 5 8. Schizo- 



DD. Fr. a berry: petals 5 or 6: styles 3-5, [phragma. 



club-shaped 9. Dichroa. 



BB. Stamens >. 



c. Petals induplicate, 7-10; style 1 10. Decumaria. 



cc. Petals imbricate; styles 1-5 11. Pkiladel- 



ccc. Petals valvate. [phua, 



D. Styles 2; petals 4 12. Platycrater. 



DD. Styles 3; petals 5 13. Cardiandra. 



2. Escallonia Tribe. 



A. Petals imbricate; style 1; ovary 2- or 3- 



loculed 14. Escallonia. 



AA. Petals valvate; styles divisible into 2; ovary 



2-loculed 15. Itea. 



3. Ribes Tribe. 

 The only genus 16. Ribes. 



4. Francoa Tribe. 

 Sepals and petals equal 



. 17. Francoa. 



The only genus 60. Rosa. 



12. Prunus Tribe. 



A. Sepals usually 10, small; petals often wanting 

 or small; carpels in the staminate fl. 2, 1 in 

 the fertile fl 61. Afaddcnia. 



5. Saxifrage Tribe. 



A. Ovary 1-loculed. 



B. Placentae basilar or nearly so 18. Tiarella. 



BB. Placentte parietal, opposite the stigmas 19. Pamassia. 



BBB. Placentae parietal, alternate with stigmas. 



c. Stamens 3 ; petals 5, capillary 20. Tolmiea, 



cc. Stamens 5-10. 



D. Caps, not beaked, superior: petals 5, 



3-cut or pinnatifid 21. MiteUa. 



DD. Caps. 2-beaked. 



E. Number of stamens 5; petals 5 or 0: 



caps, inferior 22. Heuchera. 



