()2S cxvi. riti'ic.U'E.T:. 



sometimes 2-4 or more, involuerate ; bracteoles usually small or 0, 

 sometimes conspicuous. Perianth simple, calycine, regular or irregular, 

 equalh' or unequally toothed, lobed or partite ; segments imbricate or 

 valvate. Disk hypogynous, obscure or 0. Stamens as many as and 

 opposite to the perianth-lobes, sometimes aduate to their base (rarely 

 fewer or more) ; filaments free or rarely connate at the base ; anthers 

 2-celled. Pistillode in male flowers small or 0. Ovary superior, 

 1-celled ; ovule solitary ; style often excentric, simple or 2-fid with 

 stigmatic arms, or stigma sessile, plumose or penicillate. Fruit simple, 

 indehiscent, a drupe or samara, or of free achenes, or compound in a 

 confluent mass of perianths and pericarps. Seed erect, lateral or 

 pendulous ; testa membranous ; albumen copious, scanty or ; em- 

 bryo straight or curved. — Disteib. Throughout both hemispheres ; 

 genera 109 ; species 1500. 



Plants with watery juice. 



Anthers in bud erect ; style 2-fid ; ovule pendulous. 



Fruit di-y, winged, leaves deciduous 1. IIoloptelea. 



Fruit a drupe ; leaves persistent. 

 Stipules free. 



Male sepals imbricate ; cotyledons broad 2. Celtis. 



Male sepals iuduplicate-valvate ; cotyledons 



narrow 3. Trema. 



Stipules connate, sheathing the bud 4. GnioNNiERA. 



Anthers in bud reversed ; stamens inflexed ; style undivided 

 or ; ovule erect, orthotropous. 



Leaves and stems with stinging hairs. 



Ovary oblique ; an annual herb 5. Fi.evrya. 



Ovary straight ; a perennial herb 6. Girardinia. 



Leaves and stems without stinging hairs. 



Female perianth 3-5-partite or obsolete. 



Leaves opposite 7, Lecanthus. 



Leaves alternate 8. Ei.atostema. 



Female perianth tubular, shortly toothed or 

 subentire, enclosing the achenes. 

 Flowers not involuerate. 



Fruiting perianth dry, membranous ; 

 stigma filiform. 



Shrubs; stigma persistent 9. Bcehmeria. 



Herbs (rarely suffruticose) ; stigma 



jointed, deciduous 10. Pouzolzia. 



Fruiting perianth fleshy ; stigma penicil- 

 late IL Debregeasia. 



Flowers involucrale. 



Female perianth tubular, 4-Cd ; stamens 



3-4; stigma penicillate 12. Parietaria. 



Female perianth ; stamen 1 ; etigraa 



filiform 13. Forskoiilea. 



Plants with milky juice. 



Anthers in bud reversed ; stamens inflexed ; ovule pendulous, 

 anatropoiis ; shrubs or trees. 



Male flowers subcapitate; female perianths not con- 

 fluent; style 2-fid 14. Stheblus. 



Male flowers in globose heads; female perianths con- 



fluetii ; sryie undivided, elongate 15. Plecospermum. 



Anthers in bud erect ; trees or shrubs. 



Flowers on the inner wall of a closed receptacle 16. Ficus. 



Flowers all exposed. 



Male flowers on a disciform receptacle; females 



solitary, without ])crianlh ; stamens 3-8 17. Antiaris. 



Flowers in naked or lanceolate lieads ; female 



perianth tubular ; stamen 1 18. ARTocARrrs. 



