KEY TO THE FAMILIES AND GENERA 



91 



Q. The Iv3. always simple: fr. with 

 thin dissepiments, 6-ceIled; 



seeds smootli 7. .^glopsis. 



GO. The Ivs. trifoliate: fr. S-15-celled. 

 H. Seeds wooUy. 



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



celled 8..Egl€. 



n. The frs. long-oval, leathery, 



8-10-celIed 9. Chaetosper- 



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



very hard-shelled 10. Balsamo- 



BE. Frs. not hard-shelled. (Subtribe [citrus. 



Lavanginffi. ) 

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

 cilage in cells, without pulp- 

 vesicles. 

 G. Petioles very long; Ivs. trifoliate: 



climbing shrubs 11. Lavanga. 



GG. Petioles short, often winged. 

 H. The Ivs. pinnate; rachia 

 broadly winged: frs. 3jiin. 



diam 12. Hespcrc- 



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



I. Lvs. trifoUate or bifoliate. 

 J. Petioles of medium length, 

 narrowly ^\'inged: frs. 1 



in. diam. 13. Pleiospcr- 



33. Petioles very short, wing- [mum. 



less: fla. 3-merous: frs. 



^^n. diam 14. Triphasia. 



n. Lvs. simple or unifoliate. 

 J. Frs. angled: seeds very 



long, flattened lo. Meropc. 



33. Frs. not angled. 



K. Plant a climbing shrub: 



petioles long 16. Paramig ••]/•!. 



KK. Plant a shrub or tree: 



petioles short. 



L. Diam. of frs. Hin-: 



lvs. venose: cells 



not filled with 



mucilage 17. Severinia. 



LL. Diam. of frs. 1 in. : 

 cells filled with 

 mucilage: lvs. 



smooth IS. Pamburus. 



FF. The frs. hesperidia, the cells filled 

 with stalked pulp-vesicles con- 

 taining juice. (Subtribe Citrinae.) 

 G. Lvs. pinnate: rachis broadly 



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

 GG. Lvs. trifoliate or simple: ovules 

 usually 2 or more in each cell. 

 H. The lvs. trifoUate, deciduous . 20. Poncirus. 

 HH. The lvs. simple, persistent. 

 1. Stamens S or 10, twice as 



many as the petals 21. Atalantia. 



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: lvs. 



pale below, punctate. .23. Forttnulla. 

 KK. Ovary 6-lo-ceUed. 



L. The stamens poly- 

 adelphous 24. Citrus. 



LL. Stamens free. 



M. Cotyledons aerial 

 on germination; 

 first foliage lvs. 

 opposite: fr. 

 small, 10-12- 



celled 25. Papeda. 



MM. Cotyledons hypog- 

 eous; first foii- 

 age-Ivs. alter- 

 nate cataphylls: 

 frs. 5-or6-ccllcd.26. Microcilrus. 

 BB. Fls. usually polygamo-dicecious; petals and 

 stamens free; ovules 2, except in the first 

 2 genera: seeds usually albuminous. 

 c. 0\'ule3 soUtary. 



D. Petals 4-5,valvate; 9tamen34-5: drupe 



2-1-stoned 27. Skimmia. 



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



lobed; stigma sessile 28. Casimiron. 



CC. Ovules twin. 

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

 mens 2-5: fr. 4-7-locuIed 29, Toddalia. 



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



.5-atoned drupe 30. Phelloden- 



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



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



■lA. Ovary deeply 2-5-lobed ; styles ba-iilar 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. Rufa. 

 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. 



F. Foliage pinnate: fls. polygamous. .35. Xanthozy- 



FF. Foliage simple: fls. uni.sexual 36. Orixa. [lum. 



EE. Lvs. oppo.^ite: fls. unisexual . 37. Evodia. 



DD. The fls. hermaphrodite. 



E. Albumenfleshy (unknowninChoisya). 



F. Petals erect, long, connate or con- 



nivent, forming a cylindrical 



tube 38. Correa. 



TT. Petals free, spreading. 

 G. The petals imbricate. 



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

 site 39. Boronia. 



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



alternate 40. Eriostemon. 



HHH. Stamens 10; petals 5: lvs. 



opposite 41. Choisya. 



GG. The petals valvate 42. Pilocarpus. 



EE. Albumen 0. 



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



FF. The ovary-lobea 1-5, free. [drum* 



G. Staminodes 44. Diosma. 



GG. Staminodes 5. 



H. Style short; stigma capitate; 



fla. terminal 45. Adenandra. 



HH. Style long; stigma simple; fls. 



axillary 46. Barosma. 



The following genera are also described: Amyris, Chloroxylon, 

 Diplolana, 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. AiUifithus. 



w. Stamens 4-5, as many as petals 3. Picrasma. 



51. OCHNACE.^. 



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. 



\A. Calyx small, 4-6-parted 2. Buraera. 



53. MELIACE-ffi. 



A. Stamens free. 



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



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



AA. Stamens coalesced into a tube, at least at 

 base. 



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



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



c. Lvs. simple 4. Turrxa. 



CC. Lva. 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. OLACACEjE. 



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. AQUIFOLIACEiE. 



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

 AA. Petals free, linear; ovary 3-5-loculcd 



1. Ilex. 



2. .Yemopanth- 



[us. 



56. CYRILLACE.ffi. 



A. Racemes terminal; stamens 10: caps, winged. . 1. Cliftonia. 

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



