KEY TO THE FAMILIES AND GENERA 



91 



O. The Ivg. always simple: fr. with 

 thin dissepiment , 6-celled ; 

 seeds smooth ............... 7. &glops\y. 



GO. The Iva. trifoliate: fr. 8-15-ceIled. 

 H. Seeds woolly. 



i. The frs. hard-shelled, 10-15- 



ceiled .................. 8. ASgle. 



H. The frs. long-oval, leathery, 



8-10-celled ............. 9. Ckaetosper- 



HH. Seeds smooth: fr. subglobose, [mum. 



very hard-shelled ......... 10. Balsamo- 



EE. Fra. not hard-shelled. (Subtribe [citrus. 



Lavanginse. ) 



F. The frs. small, fleshy or with mu- 

 cilage in cells, without pulp- 

 vesicles. 

 o. Petioles very long; Ivs. trifoliate: 



climbing shrubs ............ 11. Lavanga. 



GG. Petioles short, often winged. 

 H. The Ivs. pinnate; rachis 

 broadly winged: frs. J#n. 

 diam ..................... 12. Hespere- 



HH. The Ivs. trifoliate or simple. [thusa. 



i. Lvs. trifoliate or bifoliate. 

 j. Petioles of medium length, 

 narrowly winged: frs. 1 

 in. diam ............. 13. Pleiosper- 



W. Petioles very short, wing- [mium. 



less: fls. 3-merous: frs. 

 Hin. diam ........... 14. Triphasia. 



n. Lvs. simple or unifoliate. 

 j. Frs. angled; seeds very 



long, flattened ........ 15. Aferope. 



jj. Frs. not angled. 



K. Plant a climbing shrub: 



petioles long ........ 16. Paramignya. 



KK. Plant a shrub or tree: 



petioles short. 

 i* Diam. of frs. 

 Ivs. venose : 

 not filled 

 mucilage 



LL. Diam. of frs. 1 

 cells filled 



cells 

 with 



17. Severinia. 

 in.: 



with 

 Ivs. 



18. Pamburus. 



mucilage: 

 smooth .......... 



IT. The frs. hesperidia, the cells filled 



with stalked pulp-vesicles con- 



taining juice. (Subtribe Citrime.) 



G. Lvs. pinnate; rachis broadly 



winged: ovules 1 in each cell .19. Citropsis. 

 GO. Lvs. trifoliate or simple: ovules 

 usually 2 or more in each cell. 

 H. The Ivs. trifoliate, deciduous . 20. Pondnts. 

 HH. The Ivs. simple, persistent. 

 I. Stamens 8 or 10, twice as 



many as the petals ....... 21. Atolantia. 



n. Stamens 16-40, 4 or more 



times as many as petals. 



J. Lvs. isofacial, gray-green, 



with stomates and hairs 



on both faces: frs. small, 



3-4-celled ............ 22. Eremocitrus, 



33. Lvs. not isofacial, without 

 stomates on upper sur- 

 face. 

 K. Ovary 3-5-celled: Ivs. 



pale below, punctate. .23. Fortunelfa. 

 KK. Ovary 6-15-celled. 



L. The stamens poly- 



adelphous ........ 24. Citrus. 



u* Stamens free. 



H. Cotyledons aerial 

 on germination; 

 first foliage Ivs. 

 opposite: fr. 

 email, 10-12- 

 celled .......... 25. Papeda. 



MM. Cotyledons hypog- 

 eous; first foh- 

 age-1 vs. alter- 

 nate cataphylls: 

 frs. 5- or 6-celled. 26. MicrocitTU*. 

 BB. Fls. usually polygamo-dicecious; petals and 

 stamens free; ovules 2, except in the first 

 2 genera: seeds usually albuminous. 

 c. Ovules solitary. 



D. Petals 4-5, valvate; stamens4-5: drupe 



2-4-stoned ....................... 27. Skimmia. 



DD. Petals 5, valvate; stamens 5; ovary 5- 



lobed; stigma sessile .............. 28. Casimiroa. 



cc. Ovules twin. 



D. Petals 2-5, valvate or imbricate; sta- 



mens 2-5: fr. 4-7-loculed .......... 29. Toddalia. 



DD. Petals 5-8, valvate; stamens 5-6: fr. a 



5-stoned drupe ................... 30. Phelloden- 



DDD. Petals 4-5, imbricate; stamens 4-5: [dron. 



fr. a 2-3-loculed samara ............. 31. PieUa. 



AA. Ovary deeply 2-5-lobed ; styles basilar or 

 ventral, or the stigmas connate: fr. capsular 

 or 3-5-berried. 



B. Ovules 3 or more in each locule. 



c. Petals 4-5, equal; stamens 8-10, straight. 32. Ruta. 

 cc. Petals 5, unequal; stamens 10, declinate.,33. Dictamnus. 

 BB. Ovules 2 in each locule. 



c. Fls. irregular 34. Ravenia. 



cc. Fls. regular. 



D. The fls. unisexual or polygamous. 

 E. Lvs. alternate. 



p. Foliage pinnate: fls. polygamous. .35. Xanthoxy- 



FF. Foliage simple: fls. unisexual 36. Orixa. [lum. 



BE. Lvs. opposite: fls. unisexual 37. Evodia. 



DD. The fls. hermaphrodite. 



E. Albumen fleshy (unknown in Choisya). 



F. Petals erect, long, connate or con- 



nivent, forming a cylindrical 



tube 38. Correct. 



FF. Petals free, spreading, 

 a. The petals imbricate. 



H. Stamens 8 ; petals 4 : Ivs. oppo- 

 site 39. Boronia. 



HH. Stamens 8-10; petals 4-5: Ivs. 



alternate 40. Eriostemon. 



HHH. Stamens 10; petals 5: Ivs. 



opposite 41. Choisya. 



GG. The petals valvate 42. Pilocarpus. 



EE. Albumen 0. 



F. The caps. 5-loculed 43. Caloden- 



FF. The ovary-lobes 1-5, free. [drum. 



G. Staminodes 44. Diosma. 



GO. Staminodes 5. 



H. Style short; stigma capitate; 



fls. terminal 45. Adenandra. 



HH. Style long; stigma simple; fls. 



axillary 46. Barosma. 



The following genera are also described: Amyris, Chloroxylon, 

 Diplolaena, Limonia, and Spathelia. 



50. SIMARUBACE^E. 



A. Stamens 10, twice as many as petals. 



B. Petals united into a tube 1. Quassia. 



BB. Petals spreading 2. Ailanthus. 



AA. Stamens 4-5, as many aa petals 3. I'icrasma. 



SI. OCHNACEJE. 



A. Ovary 3-10-loculed: locules 1-ovuled; seeds 

 without endosperm. 



B. Stamens many; panicle lateral 1. Ochna. 



BB. Stamens 10; panicle terminal 2. Ouratea. 



AA. Ovary 2-5-loculed, many-ovuled, with endo- 

 sperm 3. Cespedesia. 



52. BURSERACE.. 



A. Calyx-tube broadly urn-shaped, covered by 



the torus 1. Garuga. 



AA. Calyx small, 4-6-parted 2. Bursera. 



53. MELIACE). 



A. Stamens free. 



B. Ovary 4-5-celled; cells 8-12-ovuled 1. Cedrela. 



BB. Ovary 2-celled; cells 1-ovuled 2. Ptaeroxylon. 



AA. Stamens coalesced into a tube, at least at 

 base. 



B. Locules of the ovary many-ovuled 3. Surictenia. 



BB. Locules of the ovary 1-2-ovuled. 



c. Lvs. simple 4. Turrxa. 



cc. Lvs. 3-foliolate or 1-3-pinnate. 



D. Anthers 5 5. Aglaia. 



DD. Anthers 8-12. 



E. Disk cup-like 6. Melia. 



EE. Disk ring-like 7. Trichilia. 



54. OLACACE^:. 



A. Stamens twice as many as the petals, all fertile. 1. Ximenia. 

 AA. Stamens anther-bearing, 3-5, staminodia 6 or 



less 2. Olax. 



55. AQUIFOLIACE^E. 



A. Petals connate at base; ovary 4-5-loculed.. . . 1. Ilex. 

 AA. Petals free, linear; ovary 3-5-loculed ........ 2. Nemopanth- 



56. CYRILLACEuE. 



A. Racemes terminal; stamens 10: caps, winged. . 1. Cli/fonw. 

 AA. Racemes lateral; stamens 5: caps, not winged. 2. Cyrilla. 



