KEY TO SUB-CLASSES, ORDERS AND GENERA. 129 
INCOMPLETA—cont. 
(+) Leaves alternate, palmately many-lobed and-nerved, 
stipules large; inflorescence of long peduncled 
globose 1-sexual axillary heads ; sepals on a chaffy or 
silky receptacle; male flowers ebracteolate, anthers 
many subsessile with a small back scale ; female of 
many (as many as sepals) naked l-celled ovaries 
mixed with slender bracteoles narrowed into a long 
style stigmatose on one side :— ... CVI—PLATANACES, 
(t+) Leaves distichous, undivided, stipulate ; fowers l-or 2- 
sexual, solitary, fascicled, cymose or racemose ; 
° perianth 4—9-lobed or of 4-5 sepals ; stamens 
opposite the perianth segments, (rarely twice the 
number) ; ovary of 2 carpels usually l-ceJled, cvule 1 
endulous :— da: ¢ is ... CIII—ULMACER. 
(ttt) Leaves usually alternate, often with milky juice, 
stipules large often amplexicanl ; flowers 1-sexual, 
crowded on receptacles which are globose, cylindric 
or hollow ; female perianth of 4 sepals or segments, 
which are often fleshy in frvit ; ovary 1-celled, ovule 
usually 1 pendulous:— __... ... CIV—ABRr0cARPACER, 
(tt+t) Leaves alternate, (more rarely opposite), stipulate, 
as arule toothed and basally 3-nerved, sometimes with 
stinging hairs; flowers 1-sexual, sessile, usually in 
. compact heads or clusters, sometimes spicately 
arranged; stamens 4 or 5 opposite the perianth 
segments, filaments inflexed in bud ; ovule erect :-— 
CV—URTICACE2. 
(B) Ovary 2-or more-locular with the loculi perfect and never 
more than 2-ovuled, rarely (EUPHORBIACE®, sometimes) 
l-locular and then the ovules 2, or if the ovary is 1-locular 
and 1l-ovaled then the stamens usually much more 
numerous than the perianth lobes, and those of the outter 
(or only) series alternate with the outer (or only) lobes of 
the perianth :— ; 
(*) Seeds with copious albumen, or if albumen scanty or O the 
fruit either a capsule or, if indehiscent, drupelike or 
berry-like with fleshy or leathery pericarp; inflores- 
cence variable, but male flowers never in catkins; leaves 
various, usually simple, (rarely digitately compounda), 
generally penninerved but sometimes palmately nerved :— 
CII—EvenHorBIAcE#. 
(#*) Seeds without aloumen; fruit always an indehiscent nut 
with a hard or tough pericarp; male flowers in spikes or 
often in catkins ; female in spikes or at times at the base of 
the male spikes ; leaves always simple penninerved :— 
(+) Male flowers in drooping catkins ; anther cells as a rule dis- 
tinct : female flowers in spikes ; perianth S or adnate to 
ovary; ovary 2-celled, ovule 1 pendulous in each cell, 
styles 2 long filiform: —... ey ... CVILI—BEtTULacEe. 
(++) Male flowers in drooping catkins or erect spikes ; anther 
cells, not distinct ; female flowers in spikes, each flower 
or group of flowers enclosed in an involucre of numerous 
bracts coalescing in fruit; perianth adnate to ovary; 
Ovary 2-celled, ovules 2 pendulous in each celi :— 
CIX—FAGACEZ. 
(B) Ovary synoarpous, 1-locular, placentas 2 or 4 not intruded, 
ovules on each placentas 4 or more biseriately superposed ; 
flowers 1-sexual, in catkins ; seeds minute with a coma of long 
hairs, albumen O; leaves simple, stipulate :— ... OX-—-SALICACEs. 
(ii) Leafiess trees with slender green jointed branchlets (often mistaken 
for leaves), usually deciduous, and with whorls of small adpressed slightly con- 
nate scales at the nodes, the scales of adjacent nodes alternate; flowers in 
spikes ; perianth segments 1—2 small; stamen 1; ovary l-Iceular 2-ovaled; 
seed 1, albumen O :— ne a ra RA oes ... OVII—CASsUARINACES. 
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