- 360 - 



al. Perigonium présent; tepals free or laterally connate and then forming 



an entire or lobed, urn-, cup- or saucer-shaped involucre to the ovary. 



bl. Spathe apparently a continuation of the peduncle, resembling 



in aspect the apex of the leaves. (8) Acorus. 



b2. Spathe absolutely différent from the peduncle, not resembling 



the apex of the leaves. 



cl. Pétiole tuberculate or aculeate; tepals always free. 



dl. Ovaries at least 2-(rareIy 1-) ovulate; ovules pariétal, 

 occupying the iower half of the placent?. 



(37) Cyrtosperma. 

 d2. Ovaries 1-ovulate; ovule not pariétal. 



el. Ovule basai. (38) Fodolasia. 



e2. Ovule pending from the apex of the loculus. 



(36) Lasia. 

 c2. Pétiole smooth; tepals not always free. 

 dl. Ovaries 1-locular, 1-ovulate. 



el. Pétiole flat, foliaceous; tepals free. 



(15) Pothoidium. 

 e2. Pétiole not flat, not foliaceous; tepals connate. 



(14) Anadendron. 

 d2. Ovaries at least 2-locular, if 1-locular, then at least 

 2-ovulate. 



el. Lower flowers $, higher ^ or ci* ; leaves 1—3- 

 pinnate. 

 fl. Leaves 1-pinnate; filaments free. 



(9) Zamioculcas. 



f2. Leaves 2 — 3-pinnate; filaments connate 



into a tube. (10) Gonaiopus 



e2. Flowers ail ^, sometimçs intermixed withafew 



1-sexual ones; leaves never pinnate. 



fl. Spathe marcescent; ovaries 1-locular. 



(6) Holochlumys. 

 f2. Spathe vegeto-persistent; ovaries 2—4- lo- 

 cular. 



gl. Ovaries 2-locular. {W) Anthuriiim. 

 g2. Ovaries 3— 4-locular. 



hl. Ovaries 3 ovulate; scandent 



plants. (16) Pothos. 



h2. Ovaries at least 4-ovulate; 



erect plants. (7) Spathiphyllum. 

 a2. Perigonium wanting, if (rarely) présent, then rudimentary, ring-shaped. 

 bl. Flowers 2-sexual, ail with perfectly developed stamens. 

 cl. Ovaries 1-ovulate. 



dl. Spadix rather stalked above the base of the spathe; 



perigonium rudimentary; spathe and ovaries without 



' acicular cells. (14) Anadendron. 



