XX ANALYTICAL KEY TO FAMILIES OF ANGIOSPERMS. 



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kk Anthers ordinary, or opening by terminal valveless pores. 

 / Ovary i -celled. 



m Placentae 2; petals 4; stamens distinct CAPPARIDACEAE 467 



mm Placenta i; petals 4-5; stamens distinct or united. 



n Petals valvate . MIMOSACEAE (in LEGUMINOSAE) 527 



nn Upper petal inclosed by the others. 



CAESALPINACEAE (in LEGUMINOSAE) 528 

 // Ovary 2-5-celled. 

 m Ovules many in each cell. 

 n Leaves tomentose beneath; flowers in umbel-like corymbs. 



ERICACEAE 696 

 nn Leaves not tomentose beneath; flowers racemose. 



CLETHRACEAE (in ERICACEAE) 692 

 mm Ovules 1-3 in each cell. 

 n A disk or ring-like growth between petals and ovary. 



o Foliage glandular punctate ,.RUTACEAE 581 



oo Foliage not glandular punctate. 



p Leaves simple CELASTRACEAE 605 



pp Leaves compound. 



q Leaflets 3, rarely 5 STAPHYLEACEAE (in SAPINDACEAE) 606 



qq Leaflets 7-many. 



r Stamens 2-3; fruit a samara SIMARUBACEAE 582 



rr Stamens 8-10; fruit a berry SAPINDACEAE 609 



nn Disk or ring absent. 



o Stamens 2, rarely 4; sepals and petals 2 or 4 OLEACEAE 723 



oo Stamens, sepals and petals 4 or more. 



p Flowers minute, greenish, axillary ILICACEAE 602 



pp Flowers minute, whitish, in long dense racemes. 



CYRILLACEAE 602 

 ppp Flowers medium or large, showy; racemes few-flowered. 



STYRACACEAE 722 

 ii Styles 2-5. 



j Leaves opposite ACERACEAE (in SAPINDACEAE) 607 



jj Leaves alternate. 



k Ovary i -celled; ovule i; sap resinous or milky .. .AN ACARDIACEAE 599 

 kk Ovary 2 -celled; ovules several in each cell; flower white. 



ITEACEAE (in SAXIFRAGACEAE) 485 

 kkk Ovary 3-celled; ovules 1-2 in each cell; flowers greenish. 



EUPHORBIACEAE 585 



lob COROLLA GAMOPETALOUS. 

 c STAMENS (FERTILE) 2-4. 

 d Herbs. 



e Ovary 4-celled, deeply 4-lobed; stems 4-angled , LABIATAE 779 



ee Ovary i -celled 



f Flowers scariouS; greenish PLANT AGIN ACEAE 856 



ff Flowers ordinary, petaloid. 



g Parasitic plants without chlorophyll OROBANCHACEAE 848 



gg Not parasitic, with chlorophyll. 

 h Flowers regular or nearly so. 



* Stamens 3; grass-like plants; flowers yellow XYRIDACEAE 235 



ii Stamens 4-12; plants not grass-like; flowers rarely yellow. 



GENTIANACEAE 728 

 hh Flowers conspicuously irregular. 



* Stamens 2 LENTIBULARIACEAE 845 



ii Stamens didynamous. 



j Flowers small; plant puberulent. . PHRYMACEAE (in VERBENACEAE) 855 



jj Flowers large; plant clammy -pubescent. 



MARTYNIACEAE (in PEDALIACEAE) 852 

 eee Ovary 2-4 -celled; not deeply 4-lobed. 

 / Flowers scarious, greenish PLANTAGINACEAE 856 



