cxxiiiD. URTiCACEiE (Reiidle). 



241 



'I'ribe I. LJRERE.^. — Pcriaiiih of male flower 4-3-pariite. Fcnidlr Jlutrrr 

 qemrally with unequally -i-lobed or -partite perianth, rarely 2-partite or sac- 

 like, free from the ovary ; rudimentary damens absent. IStigma various, 

 penicillaie, linear, subulate, sometimes relatively broad. Achene ovate or 

 rounded, sometimes oblique, invested below or mare or less enveloped by the 

 persist eni membranous or succulent perianth. Embryo with rounded often 

 emarginate cotyledons ; albumen scanty. Herbs or shrubs, in the latter 

 case sometimes climbing, rarely trees ; stitvging or sharply pointed hairs 

 frequent ; cystoUths dot-like or linear. Leaves alternate, morerarely opposite. 



Leaves opposite ... 

 Leaves alternate. 



Stipule.s free, lateral, 



branous in fruit ... 

 Stipules united, interpetiolar. 



Annual herbs ; cystoliths linear ... 

 Perennial herbs, shrubs or trees. 



Female perianth of 4 iinbrieatc segments 

 are unchanged in fruit ; stigma 

 Cystoliths dot-like ... 

 Female perianth 4-lobed, fleshy in fruit 



])enicillate 



Female perianth of 2 very unequal lobes, the 

 larger concave and spathe-like ; stigma 

 subulate. Leaves large, grossly serrate, 

 often lobed ... 



Perianth enlarged and mem- 



5 which 

 linear. 



stigma 



1. Urtica. 



Obetia. 



3. Flelhya. 



4. Laportea. 



Urj^ra. 



(>. Girardinia. 



Tuibi: 11. PROCRIDE/E. — Perianth of male flower generally -i-partite, segvienta 

 often with a subapical process. Female flower with generally '3-partite 

 perianth, segments often unequal, sometimes very small, free frorn the ovary ; 

 staminodes flat, scale-like. Stigma penicillate. Generally herbs without 

 stinging hairs and with linear cystoliths. Leaves opposite or apparently 

 alternate from the suppression of one member in each pair. 

 Ix'aves opposite, those of a pair sometimes unequal. 

 Flowers in panicled clusters or in heads, sometimes 



laxly paniculate 



Flowers sessile on a disc-like receptacle 

 Leaves of each pair at slightly different levels, one 

 represented by a small blade or stipule or quite 

 suppressed. 

 Female flowers in a receptacle formed by union of 



bracts 

 Female flowers on a fleshy spherical receptacle 



Pilea. 

 Lecanthus. 



Elatostema. 

 Procris. 



Tribe 111. B(EHMER1E/E. — Perianth of the male flower -i-o-partile, segmeyits 

 without appoidages. Female flower with tubular- re ntricosr 2-4-toothrd 

 perianth, united with or free from the ovary, membranous or succulent in 

 fruit. Stigma linear or penicillate. Generally woody plants without 

 slingi)ig Juiirs and with usually dot-like cystoliths. Leaves opposite or 

 alternate. 

 Perianth of the female flower free from tlie ovary, dry 

 or membranous in fruit. Stigma long, linear. 

 Stigma persistent in fruit ; leaf-margin serrate ... II. litKHMERiA. 

 Stigma not persistent in fruit ; leaf -margin generally 

 entire 



Perianth of the female flower united with the ovary 

 fleshy in fruit. Stigma penicillate 



12. POUZOLZIA. 



]'.]. J>rbreoeasia. 



