xvi | KEY TO THE ORDERS 
. DICOTYLEDONES 
Corolla wanting, except in the pistillate flowers of Juglans (Juglandaceae). 
Calyx DIM at least in the staminate flowers, SEED sometimes in 
Casuarina (Casuarinaceae). 
Flowers mainly perfect. 
Seeds solitary in each carpel or in each cavity of the ovary: 
endosperm present. 
Flowers spicate: styles wanting: stigmas sessile. 
Order PIPERALES. 
Flowers axillary: styles present. 
Gallitrichaceae in Order EUPHOBBIALES. 
Seeds numerous in each cavity of the ovary: endosperm wanting. 
Podostemaceae in Order ROSALES. 
wers monoecious or dioecious. Order EUPHORBIALES. 
_ Trees or shrubs: flowers monoe ci ous or dioecious, or po seama 
Leaves represented by appressed whorled scales: stems ner ches 
loosely joint Order CASUARINALES. 
Leaves noe "appressed seales: stems or branches not loose jointed. 
- Fruit 1-seeded : e Without tuits of hairs. 
vules 1 or 2 in each c of the bad: flowers not in heads. 
Gonocelunm a stigma 1: ovule laterally attached 
and amphitropous. ro der LEITNERIALES. 
iK ce Or pend stigmas a e oo and amphi- 
hotropo Order MYRICALES. 
Pistillate. flowers with a calyx: ovule pendulous and 
ous. 
at blades simple. 
nut or an achen 
Oo in Order FAGALES. 
Fruit & dru Olea s E IOS OLEALES. 
Leaf-blades Comp um: fruit a s 
eaceae an Onder OLEALES. 
Ovules many: flowers aggregated into dense heads. 
Altingiaceae m Order ROSALES. 
Fruit many-seeded : seeds each with a tuft of hair 
Or de E SALICALES, 
Calyx present at least in the staminate or in the perfect flow 
aves represented by appressed whorled scales : branches Weasels jointed. 
rder CASUARINALES. 
Leaves not appressed scales: branches not loosely jointe ca 
Flowers, at least the staminate, in aments, or c Hm spikes. 
Leaf- MATE simple: ovule pendulous and anatro opou 
Pis AA flowers separate at maturity : fruit. 2 nut or 
BEES. 
Pistillate flowers forming aggregate fruits T drupe-like. 
. Artocarpaceae in Order URTICALES. 
Leaf-blades pinnately compound: ovule erect and orthotropous. 
er JUGLANDALES. 
Flowers, at least the staminate, not in aments. 
Ovary feed 
Gynoecium ‘of 1 or several and distinct earpels: stigma and 
tyle solitary. 
carpe solitary. 
tyle lateral and Be leery 
Petiveriaceae in Order CHENOPODIALES. 
Style, axile, érec 
Ovary “neither a nor seated in a hypanthium 
Flowers not solitary in axils; land plants. 
Filaments free and distinct. 
Urticaceae in Order URTICALES. 
Filaments ganas to the sepals or to the 
ealyx-tube. Order oe aa 
Flowers solitary in axils uatic plant 
Ceratophyllaceae Ha Order RANALES. 
Ovary ne in or seated in a hypanthium or 
alyx-tu 
Stamens d under the gynoecium. 
llioniaceae in Order CHENOPODIALES. 
Stamens borne on the hypanthium or adnate to 
the calyx-tube. Order THYMELEALES. 
Carpels several. 
Stamens inserted below the ovary. 
Families in Order RANALES. 
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