CXXIIJp. URTICACEZ (Rendle). 241 
Tripe I. UREREAS.—Perianth of male flower 4-5-partite. Female flower 
generally with unequally 4-lobed or -partite perianth, rarely 2-partite or sac- 
like, free from the ovary ; rudimentary stamens absent. Stigma various, 
penicillate, linear, subulate, sometimes relatively broad. Achene ovate or 
rounded, sometimes oblique, invested below or more or less enveloped by the 
persistent membranous or succulent perianth. Embryo with rounded often 
emarginate cotyledons ; albumen scanty. Herbs or shrubs, in the latter 
case sometimes climbing, rarely trees ; stinging or sharply pointed hairs 
frequent ; cystoliths dot-like or linear, Leaves alternate, morerarely opposite. 
Leaves opposite... ASL 36 Re a -.. 1. Unica, 
Leaves alternate. 
Stipules free, lateral. Perianth enlarged and mem- 
branous in fruit ay os ae ve 
Stipules united, interpetiolar. 
Annual herbs ; cystoliths linear ... Se ... 3 FLEURYA. 
Perennial herbs, shrubs or trees. 
Female perianth of 4 imbricate segments which 
are unchanged in fruit; stigma linear. 
2. OBETIA. 
Cystoliths dot-like ... tee ae ... 4, LAPoRTEA, 
Female perianth 4-lobed, fleshy in fruit ; stigma 
penicillate ... oa 5. UreEra. 
Female perianth of 2 very unequal lobes, the 
larger concave and spathe-like; stigma 
subulate. Leaves large, grossly serrate, 
often lobed... : 6. GIRARDINIA. 
Trine II, PROCRIDEZ.—Perianth of male flower generally 4-partite, segments 
often with a subapical process. Female flower with generally 3-partite 
perianth, segments often unequal, sometimes very small, free from the ovary ; 
staminodes flat, scale-like. Stigma penicillate. Generally herbs without 
stinging hatrs and with linear cystoliths. Leaves opposite or apparently 
alternate from the suppression of one member in each pair. 
Leaves opposite, those of a pair sometimes unequal. 
lowers in panicled clusters or in heads, sometimes 
laxly paniculate ... Sr aes aR 7. PILEa. 
Flowers sessile on a disc-like receptacle... ... 8, LEcANTHUS. 
Leaves of each pair at ey different levels, one 
represented by a small blade or stipule or quite 
suppressed. ; 
emale flowers in a receptacle formed by union of 
bracts : ets vue ioe ons ... 9 Etatostema. 
Female flowers on a fleshy spherical receptacle ... 10. PRrocris. 
Tripe III. BOSHMERIEA.—Perianth of the male flower 4-5-partite, segments 
without appendages. Female flower with tubular-ventricose 2-4-toothed 
perianth, united with or free from the ovary, membranous or succulent in 
fruit. Stigma linear or penicillate. Generally woody plants without 
stinging hairs and with usually dot-like cystoliths. Leaves opposite or 
alternate, 
Perianth of the female flower free from the ovary, dry 
or membranous in fruit. Stigma long, linear. 
Stigma, persistent in fruit ; leaf-margin serrate... 11. BaHMERIA. 
Stigma not persistent in fruit ; leaf-margin generally 
entire ss Re er ae evs ... 12, Povzowzia. 
Perianth of the female flower united with the ovary, 
fleshy in fruit. Stigma penicillate .» vee 18. DEBREGEASIA. 
FL. TROP. AFR. VI. SECT. Il. R 
