KEY TO THE FAMILIES AND GENERA 



97 



D. Cells of the ovary as many as styles, 



each with 2 ovules. 



E. Ovary 2-celled: fr. l-2-9eeded, 



black : fis. in upright racemes, 



sometimes panicled: Ivs. evergreen . 30. Rapkiolepis. 



EE. Ovary 3-5-celled: fls. in umbels: Ivs. 



deciduous.. .31. Pj/rus. 



DD. Cells of the ovary twice aa many as 

 styles, each with 1 ovule. 

 E. Styles usually o; fls. in racemes; Ivs. 



serrate, or crenate at the apex 32. Amelan- 



EE. Styles 2-3; fls. in few-fld. umbels; [chier. 



calyx-tube cylindric: Ivs. entire or 



denticulate, narrow 33. Peraphyl- 



[lum. 



5. Kerria Tribe. 



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



achcnes 2-5, drupaceous 34. Neviusa. 



AA. Petals present; fla. solitary, large. 



B. Lvs. alternate: fls. 5-merou3, yellow: 



achenes drupaceous, yellow 35. Kerria. 



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



dry. black 36. Rhodotypus. 



6. PotentiUa Tribe. 



A. Style deciduous. 



B. 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. Sibhaldia. 



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

 CC. Pistils very numerous. 



D. Petals white or yellow, obtuse or emar- 



ginate 41. PotentiUa. 



DD. Petals purple, abruptly acuminate, 



much smaller than calyx 42. Comarum. 



AA. Style elongated after anthesis, often plumose. 

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



c. Sepals valvate; 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: lvs. undivided: prostrate 



undershnib 46. Dryas. 



7. Rubus Tribe. 



A. Drupelets pulpy 47. Rubits. 



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



8. Cercocarpus Tribe. 



A. Fls, apetalous; style elongated and plumose 



in fr.; hypanthium tubular 49. Cercocarpus. 



AA. Fls. with petals. 



B. Style with terminal stigma: lvs, linear, 



needle-shaped 50, Adenosloma. 



BB. Style with decurrent stigma. 



c. Lvs. 3-6d at the apex: sepals imbricate: 



fr. inclosed about half 51. Purshia. 



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

 closed 52. Chamxbatia. 



9. Ulmaria Tribe. 



Herbs with large pinnate Ivg. and large stipules 



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



10. Sanguisorba Tribe. 



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

 series or in Agrimonia with a setose Umb. 



B. Petals 54. Alchemilla. 



BE. Petals 4 or 5 55. Agrimonia. 



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



B. Fls. axillary, solitary 56. Margyri- 



BB. Fls. spicate or capitate. [carpus. 



c. The calyx \-alvate; stamens 1-10, short; 



carpels 1-2 57. Acssna. 



CC. The calyx imbricate. 



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



carpel 1; stamens 4-12 58. Sanguisorba. 



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

 cious, rarely bisexual ; carpels 2 ; 

 stamens oo 59. Poterium. 



11. Rose Tribe. 



The only genxis GO. Rosa. 



12. Prunus Tribe. 



A. Sepals usually 10, small; petala often wanting 

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

 the fertile fl 61. Maddenia. 



A A. Sepals 5. 



B. Carpels solitary. 



c. Style terminal: Ivs. usually serrate: pith 



of branches sohd 62, Prunus. 



cc. Style lateral: lvs. entire: pith lamellate,. 63. Prinaepia. 

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



13. Chrysobalanus Tribe. 



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

 inserted in the base of the calyx-tube; stamens 



15 or more 65. Chrysobal- 



[anus 

 The genus Plagiospermum is also cultivated. 



72. SAXIFRAGACE.^. 

 /. Summary of Tribes. 



A. Plants are trees or shrubs. 



B. Lvs. opposite 1. Htdranqea Tribe. 



BB. Lvs. alternate. 



c. Stipules absent: lvs. 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-merou3; seeds 



immersed in pulp 3. Rises Tribe. 



AA. Plants are herbs. 



B. Fls. 4-merous 4. Francoa Tribe. 



BB. Fls. generally '5-merou3 5. Saxifrage Tribe. 



//. Key to the Tribes, 



I. Hydrangea Tribe. 



a. Ovary superior. 



B. Number of petals 4; stamens 10; fllaments 



2-lobed; styles 3 1. Fendtera. 



BB. Number of petals 5 or 6. 



c. Ovulessolitary: stamens4-12; styles 3-5. 2. Whipplea. 

 cc. Ovules 4: stamens 15; carpels 2, 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-iobed 



stigma 5. Carpenteria. 



AA. Ovary inferior or semi-superior. 

 B. Stamens 8, 10 or 12. 



c. Petals induphcate 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: petala 5 or 6: styles 3-5» [phragma. 



club-shaped 9. Dichroa. 



BB. Stamens oo. 



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



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



ccc. Petals valvate. [pkus. 



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. Ilea, 



3. Ribes Tribe. 



The only genus 16. Ribes. 



4. Francoa Tribe. 



Sepals and petals equal 17. Francoa* 



5. Saxifrage Tribe, 



A. Ovary 1-loculed. 



B. Placentje basilar or nearly so 18. Tiarella. 



BB. PlacentBP 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. Hvuckera, 



